Loading...
Subcommittee Agenda 10/19/2016 2016 Land Development Colter County Code Amendments Growth Management Department - Public Meeting - Development Services Advisory Committee Land Development Review Subcommittee Wednesday, October 19, 2016 2:00 p.m. —4:00 p.m. 2800 N. Horseshoe Dr., Naples, FL—GMD Building Conference Room 609/610 Meeting Purpose: Agenda: To continue 1. Call to order committee review 2. Approve agenda and discussion of 3. Approve meeting minutes a draft LDC Amendment that a. September 12, 2016 establishes b. September 19, 2016 drainage/ 4. Review revised LDC amendment draft storm water a. Staff overview management b. Review updated draft standards for c. Update on timeframe of amendment vetting and residential uses. adoption d. Review City of Naples Stormwater Plan criteria 5. Public comments 6. Next meeting date 7. Adjourn News Release posted October 11th, 2016 For more information please contact Jeremy Frantz at(239) 252-2305 or ieremvfrantz@colliergov.net 3 3 (ID O raul rr O cr D = 0 „„,, uo to p r1 0 -1 r* PO CD = rn �� .6 o) o ( c s 1:,,i N c N Q Q N r* N Cr*D N CD O (D Q 2). N 0_ CL 1 Q Q Q O • -h N Q w, O o � o - g o NN • O 3 U0-. -I U vl �1 -0 -1 r* 13) • n ° 1 O r- -• n m o n- r Z N N = v -0 d Ni 71 O d 0r-1- [D N CD = Q c N Cu O N Q tn rri- -D N 7.', C 30 < o rD N o- 3 O' N `G — r=' N N 0_ -o rD 1 CD fD Q 5. 7) cu ri O ua 0 C O = fD N r+ n - rn c 0 0 0 1• O , N a- N C 1 I-,- N = 0 rt- 0 N CD d • N .1-11'r'r N. = CD 3 rt, O = Q X r* n' N 2) CLo N -41O 1 (i) p r-r 0 0 D rn 3 D D rn =' rt rt CD rort CD N co N [D CD H N a - 3 = 3 -nN w o O o o rn oo =o rn r 2 N = No N • -0 o rD � rD. -� rD < o. 0 SM < 0 sw in C H-1 N N • • :7 as .e. r I �<o 4 ' fi CD S n (r) o 70 n n. = = D- = m r- rD rD �, rD o rD c O< o pw r1-r O Q1,Fi• r* n < rD rr-r co Q c S S r•r . . O: - �. Q • r - S rD r* p- r•r o (IQ CD if., v' n DJ = N rD ,O rD rD N < o S O N �O N "a rD ua c,- S 0 n- in rD "O 0) -• • - n -z 0 --h a) n - uo B v" 0 vl CD 3 u0Q a rD rD 0 r+ r- .0 D C O� - O rD p n O N c N 5 N N fl' o N' N -p O rD d -1 r•-r rD O� S H N CD B y rD O N (D d O rD v' Cl. rt rD O- N un orD = r.f. F BCD o_ m0 0 � n CD ' • = n v, O 0 fa)=UCI N. O i-rrD y E. n UQ N v, rt ..; STIP c rD c C ,D a 5 5 rt N f"f minal. -v o rD rn m N = n `< _ � S cu N _- O ua rD r-r 0 N V . y 2 , 1 VO O v O M r* r* _ CD 0 j < -1Ort rD CL N Di 0 S - C N n rt uc N N rD N, rDD unC. a C N 0 N d dSW rrtr rD O r-1- = r - cy CD r-r O S O" rt rD rD �^ S CU r••r rD n un N rD - S O 0 n rD rnCf0 0) 0 rt of d o (71': S S O NrD u43 ;< — f01 0) 0 O, -, �• ^' r•r rt 0 n - 00 i +/ rr [ , O- v+ tin •`� N -1 rD d -1 rD y N `< a I 1, 9. e `5- v ,r %.,‹ ;7.,- o . ' fi. = (to (D r1—. 3 v) CD (D cn BCD (r) vl flCD CD MCD p —.• -N = , M 713 tr° VI VI m 1 0) = •m m.• r- t—i- i:L (pa f—t v) ' CD CD 5W LA 0 _.,...._. ri cl) 0 0 (i) (JO v) cp = ti) = rD 3 o c CD _ "KV/ 0 "j = (1) 0- (D (D 0 —1 (to C Cl, t—t- m C rD ••••1• V) . Om , = ( ' a 0 = CD (JO CI ,--- (D —.. (D 0 r—r 3 ; V) -.• 0 nr) (D CD M f— CA 0- (1) CL r—i- rD 3 CD v, 0_ 0) _.. = cu o_ rt• t—r (D 0 0 r) • C -N = , DJ 51) , Z = v) = (D 0 , = 2) _,....„,,,,. , . .-'-',.-q'..,g,f,grOk+,:,=..,---iW,,,,•.4-2,--'...;,:,'."-,-,':,' '-',.-,'"'"-.''''tt,-.,-,--4I-W"I 4 ,. 5 Percent Impervious Area 0 0 0 0 0 0 0 0 0 0 z � 3 1 1 of `� F Imo+ 0 tin r� 1, W T A 0 00 U, T E F C Q co C H I CrCIm In y I ID ur 1,7 c . -E 3. ( a FIT (Dx 3 3 3 B. A A 3 (D FD— rn a• O 70 C ,, W oo _, N N - ttn C V DD 0% x �0 - N W Os (/1 W •O Os *--.I 00 - 0 0 0 0 0 N W 0 N N W O. 70 o W N 00 N � c:' -� = ,M V NJNJAJJ73 W Li c=c) o o\� o\� �• C N 0 , ...i• co NJ NJ NJ W U't W cn O Oo ` , 1 o\o \ \ c :. oR v m N 1 N Percent Impervious Area • 3 0 0 0 0 0 0 o CD CD lNT1 n N I rD rn N N Fla rn N ( , r � N N D r V 5D rt U'I — 1 CD N 1 „..„._,. 0 (D -0 Z a. ” L<•rD w —1 ...„, SW 0.) f—I — 1 . ri- —.• A*ET-Strft:4 _.. rD rD {7.,..4.Wfgfter; ?-.44V4i!!'s;:',..,7,.., -.;iW:4-, ..,..,5 4Wg'[:=:W. ° .._, • ,,,,,,g,...:tia.,,,,.:.,•.,,. .:Lre,,, • . 1 .. u 4::. n•-• • ::. '1`,!.F,I;Z,f,,,,;:77:7, ...„. -.FAZtit,t',77" tiNA- ,,..'•:- ,,--tit-i..- A . • • •_, ''';''''' — Cs .2 :* •1 •_4010 *N....L S c::•..;4,3 z.5.5.,::. oNs 0 N oN, - CN N.) NJ ....., 00 ----- .- -r , , ,„ ,,, ., „, ,_ .„,. , . ,, ......, ,..„,.. - _,, .,... - . `-'-',- , \ ----'-'--, -*--',>-.- ‘,. \ .., ni N 0 U'Q r-r rr r�� 0 0 0 0 0 0 0 N e o 0 0 o e o N 1/41.0 U, c-I. fli 1%) Di N to N ° . ••ml• 3 3 CI u,rn 1 0H (1) gr i 7)O N .r• 0 C On LA o w cn v r o Di .O NN O c 0 0 0 . N 3 51) U'o C 0 ''r XnI . a Np a A 3 CD CU rn rn e—l' N 0 cn �I .o N r -4, Z v, ON cn v O O O o 0 0 o H m E. uo vi cr% ''' j\ o r .... _.......`- .ski' Z A ON o CN 3 o r o to m N 0, d .. o m fs N O N A O 00 O N O O O O b b b N e e e e e e e U, n n vi o V 3, pmateso Cr ir, Cu Es ON rD CDn 0 Di + (QJ -IN - _, r w w o o N CA./ UQ O C nal 'D Vi rD riv ? r1 3 A CL I() = C 0) = 2)OC Fla CD rt o ...,. rn rD n 0 w - Ui — o C O un O N g 0D O N ,V e e e o 0 N N 3 1 N.) a r w N > � 6s sa x ate vir _- , • : . - - -..-4 I• ..., ., _ .. i • , k . . - *-1 •= ' - - 4 1 ''. .... ' ditt .- . , we . • , - ., 'It ,. .... s . .....„r.r .. NIS '4' '• ' -'' * 1 JIL• . ' 44'. ' s'tikk.• -...,.. .4111:,''. V .,,.. ,, ,... ....., 4, ii ' .,-..:,,,„Aii •- 'fike•I'- ' .., ., . . 1 isseic 1 ''‘: lr . , ui co •-, z N.) • . • 0% c.ri 2 c) .1. .0 -,- 1— r") 0 — 01 3 = ,-t —‘ 0 -Cf n 0 —N CD 9 Lri 3 ,, F.). CD -p.' n -1 C/C1 C PL) v) UO . r- 0 t-1- -s fp f'D „..._.- `• •"'''':"ii,',--.-,..,z.---„,;+-11-;,,,,,, ,-;i,-----1:f--,-,`---m7.2, -. ,-.....,....,-,... ,..,.. „....,...,?...„..,.,,., li ,Allik 1 I I id" ,11 i .1 -- •ow, 1 1 11 kill I ! = _ .F1A_a, sr p 10 I ,.. •,, F ' , —• iss0 ,....., , ..... .. , .,. ....... . . ..-cs (D ‘,-414. ...... ..._, < Vit ,., AMP .. .,011 . T..1. L... V) 1 r.. ("D c) V) L..-) 4 ui • • .....1 0 0. _p 0 (....) o = = -11 rri _ i o 3 3 ,- ti4 rt oui (D r) uct < r -• (D --I, 0 0 -1 r-e re r-t- c sw rii) ct• (to > (1) CD CD 4 4 ,/,../,„,„21„. - -*-,..". ...km,.. -`,'-4, ,,,,,,,,,..- '..D.1-f-,--P' r'•,,.•',-, ,40,,..t4,,--..,,...,_ '.• J 111111IMMIRs'. , .. .., ..--.40, 1...-1111 ''',11111111.111111 ' / ........t ,:-.77,-.-,•,..,-,, -,,,,,,,e' •,,'',4d'' •- y _ '' MIIPNIIIIIIIIII' giiNN/10//1/110•11 11111111111111 _ 4litt,. W',...NaTt../... -......,1 3 - ....1-. ......i:, It il 0- ,-' 't10 "Z •if-,-,' .., -.-A '' .. r-- -. . ..,.... ,0 ....„.,,,,,......, 1 .,...,,,.... 1 .... .,....g.,- , .......,,, . . . ,. ,... .. ...,.- ...”%. ',2,....' . rD r'..4.---!-;;„--:: '''14'.°.,„'' :'-'• ,-i• 0 .„..,.. i ,_ '-e--- , ----:: . ., , - ... 6„:„..,......., ''5'.r.'.''*.'..{--'...1. ' - • ,::-.-. ,,'''..,. .. ., ,.„.:. . . .1. . ...,-..,,,. -.... ......'...j ..,,.,.,1..,,,.•,..,,4.... .I 1 ? , '... MS 12121 t4- ,. .' .---. 4'4, •••••,44,4444p4primperi, .' r•..) . X Z .1 0 Q• Op CD C3 %C) LTI co r) -+ = —. < 0 (D — c r1) 0 –1 '' i0 (s(:1 _ > crD –1 D CD sai,-.-,,,„!•-go-,•,-;_,----,-- ',•-v;.-,,•••-t4:-41''!?:,•-•-•,,- „,,,,,,,,,,,!,.,c4:.1.c,„,i'-'1:••,,I,-.,-: ,'-,,,--,,,,;..'---,.1.,-pi,.,,,,:„:„•,,,-,-,',-,,,,-,,,,-.:,,-,_ - --,--,”:,- -- - ‘,.-,,,",,,.-._!:,,z-,q.,.-_,:.i",,,i.t!,!-..,!,.-,:,,-0.,','''-•',----,'• --- --- , , ,---,,r,f,,--z„-;::,,katow----;,-'-,-',••=,.•,-,‘-',,,'---------•--- - --'- - -4-.''..'' - -' ... . .-:.- .. •• . . . .' . ' ', N I. illkiiir ,� � `‘ h4 �t ay t 1 Y gyp, b,�,�j� #Qi4 x pi YP ��,,. z ''. ��4 � ,,.1.0.0#:,:.---fief � �...� o a�j N x ‘p — Z co cn 0 W I— n 0 B 0— I 0 o 5 0' '� (in r D lb rD o rD sw 0 • • vis r"t. ri- l J O N A C, 00 O N A 0000 O 0 C O C C...' O O O b cos:?, O 0 0 0 * o \ 0 0 0 wmasffiz n ill} to o v to \"\ \\°\ „oarinst*,„ 4„,,,,,, '44%,,f 1 I.4. n N N W O` 00 O< r —• \ \ Oo\� o\0 QJ r* Da 1p 3 O C -.0 ti C A- A 3�— = c 2 rD N N D ," LA) w (xi •�I ?D 0 c F+ N N N N O N A Ch 00 • A IE00 O o * o * ee\e eee b b e IJC e 3 I x O . EMI O D -°-'-'1,'. .wR- g rr' 'ri 4 - + O. y. C r N CU 'A :Tj- —' CD — vu�wN.n a ,g a.ti ,, M.' - t -" y s• . r i. 4 fir- "}. .. 4,t 8, I =1 .' A.;!.. s- 2 I a .;. ' fP ' --;;i:-- - ., r t £ AMM ws y � •isr rt a „' ' � tvi 1. v £ ' � W} Fr_I i ro .,S _ ftoo — * t - a _ a . t ) t ! ';•1°-'141;1-"-- Ld 5' T •� - h .- S K s Low cAY i ! F „.v. NO N. �Y a� p 01:Ai- a..' ,.fie �� a..n .I 'I' .4 -1Tri -, W t ^ ' V 1 lit i , -N, : ra) < , , .:, , : .,,,,„ ,. ._. ,.:. .,„ . -‘'' ,.., “,_ .-•,..1!••,..: , '-, .-' - ' • t6oeur 'LARDY .. s. a. n j i 4' '#...._ H ' , *4hY^ `. ! V x . aV t'.. a. t y. R 4i., . l 'x C 5 '"i ,,,,,,,,. —_G^^ttro crD'IY1M , Z m { ' a,rp "F .�'..4.;;4: w s y yr. ', t } gH�uc Ju�pp CT 1100011Sy,4, , '.'"\•. 1"-; .;',',-r* •_ ,�$ -116'.' 'iii►�! ,y.4''''''''.''''..s.., s� �r*Iii a4 3 'Id'�1 ty J 5 r a s t . 7- �:``t. `` nc...Dori r..� .. .c N Otl+M•-. 1 . P 1 f, "Y.< 3 F-J �` w "IL' P bhp 9 4 a 9- 4 q Text underlined is new text to be added Strikethrough text is current text to bo deleted Bold text indicates a defined term Amend the LDC as follows: 1 6.05.01 Water Management Requirements 2 A complete stormwater management system shall be provided for all areas within the 3 subdivision or development, including lots, streets, and alleys. 4 A. The system design shall meet the applicable provisions of the current County codes and 5 ordinances, SFWMD rules and regulations pursuant to Florida Statutes, and the Florida 6 Administrative Code, and any other affected state and federal agencies' rules and 7 regulations in effect at the time of preliminarysubdivision plat submission. Water l 8 management areas will be required to be maintained in perpetuity according to the 9 approved plans. Water management areas not maintained will be corrected according to 10 approved plans within 30 days. 11 B. Where stormwater runoff from outside the subdt)941847 development historically 12 passes on, over, or through areas of the subdivision or lopment, such runoff shall 13 be included in the stormwater system desig .`Che system s be designed for long life, 14 low cost maintenance by normal methods and provide for opt on-site detention of 15 stormwater runoff and groundwater recharge in accordance with--;•plicable County and 16 SFWMD regulations. 17 C. Any structure with an outside wall which is closer than10 feet from a - property line 18 shall install properly sized (mini um twenty-four se -re inch cross-sect. )gutters and 19 downspouts to direct stormwater*ay from neighs',• ,;ng properties and toward front 20 and/or rear swales or retentionfdetentiars areas. 21 D. In-ground percolation type retention systemssuch as rock trenches, exfiltration trenches 22 or beds, infiltrator type systems, gallery type systems, etc., shall not be used to achieve 23 water quality retention for residential subdiviiions. Rear yard open retention systems 24 shall likewise ,s 'be'be designed to achieve water quality retention on projects submitted 25 after January 2002. All retention systems for projectsdesigned after January 1, 2002, 26 shall be on corn =s"..roperty owned and maintained by a homeowners' association or 27 similar entity. �` 28 E. Any canal which forma a part of the public water management system shall be dedicated 29 for care and maintenance per the requirements of the governmental agency which has 30 jurisdiction. Canals located ely within the subdivision and which do not form a part 31 of the public water man gem stem shall be dedicated to the public, without the 32 responsibility for maint- nce, - ° drainage easement. A maintenance easement, of a 33size acceptable to the s ty Manager or designee or other governmental agency with 34 maintenance responsibilshall be provided adjacent to the established drainage 35 easement, or the drama,= easement created must be of a size suitable for the 36 proposed canal and its ntenance. 37 F. _ e •• . : 'o :• - - -•• 'e• 'e- • Drainage/Stormwater Plan for Single-Family 38 Dwelling Units, Two-Family Dwelling UnitsLand Duplexes. 39 1. Applicability. Any application for a building permit to allow the development or 40 - e --• - - - - - • - ' - . - -- . - 41 after July 1, 2008, except for the following conditions: 42 a. Any application within the boundaries of development projects that have: 43 (1) been permitted by the South Florida Water Management District for 44 Surface Water Management or Environmental Resource Protection and 45 {2) have a central surface water management collection, storage, 46 treatment and discharge system; 1 I:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Strikethrough text is current text to be deleted Bold text indicates a defined term 1 b. A one time addition is allowed for certain sized homes, as set forth below; 2 sF • 3 ' • --- -- - ---- -- - - - - ' - - - - .. - - - 4 and sealed by a registered Florida Professional Engineer. 5 Table 6.05.01 F. Lot Size Lot-Coverage Impervious Area Coverage Under 11,000 sq. ft. 25% 49% 11,000 sq. ft. to 52,999 sq. ft. 2,750 sq. ft. +5% of area in 41,100 sq. ft. +5% of area in and 100 ft. or greater in width excess of 11,000 sq. ft. excess of 11,000 sq. ft. 11,000 sq. ft. to 52,999 sq. ft. 2,750 sq. ft. +2% of area in 4,100 sq. ft. +2% of area in and less than 100 ft. in width excess of 11,000 sq. ft. cxcec.s of 11,000 sq. ft. 53,000 sq. ft. and over X1,850 sq. ft. +3% of area in 6,500 sq. ft. +2% of area in excess of 53,000 sq. ft. excess of 53,000 sq. ft. 6 - • - - • - - - - - - - - -- --7 the total lot area shall be as provided for in Table ', '5.01 F. unle 's accompanied 8 byan engineer's analysis as ecified below. 9 Y� �p 9 a. The site drainage analysis shall include water . ality calculations to 10 SFWMD standards and water quantity calculations done to accommodate 11 the runoff, from area in excess of the a,' eve ratio, from a 5 year 1 day 14 -- ••-• - - -- - -- - -- -- - - - - -• -- - 15 must match that used for the drainfield design. 16 b. The application site plan shall list all required separatie-n-_stances 17 18 : -- - Via ' .- - " - - - _ _ • - 19 separate Engineer's report, b musf .°Po migned and s aled by the 20 21 c. The,; ater s ice area of swimming pools and ponds is not considered 24 25 The addition;will be limited to 3 percent of the lot area up to a maximum of 1,000 26 square feet as long as that one time addition docs not exceed the ar a in Table 27 6.05.01 F. by more than 3 percent of the lot area or more than 1,000 square feet. 28 29 1. Purpose. The purpose of this section is to require a drainage plan to manage 30 stormwater runoff on lots with single-family dwelling units, two-family 31 dwelling units, or duplexes in order to prevent detrimental impacts on-site or to 32 adjacent properties. This section is also designed to provide a method for 33 demonstrating compliance with Collier County Code of Laws and Ordinances 34 section 90-41 (f)(8). For the purposes of this section, the term impervious area 35 shall not include pervious decks, sand-set pavers, [add to list?1. 36 2. Applicability. A drainage plan or stormwater plan shall be required for lots with 37 single-family dwellings, two-family dwellings, or duplexes in accordance with 38 LDC section 6.05.01 F.3, except lots located in the Rural Agricultural (A) zoning 39 district outside the coastal urban designated area as established in the Future 40 Land Use Map and outside the Immokalee Urban Area Overlay. 2 l:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Bold text indicates a defined term 1 3. Plan submittal. A stormwater plan shall be required concurrently with an 2 application for a building permit or to rectify a code enforcement violation for any 3 of the following in accordance with this section: 4 a. New structures; 5 b. Additions or redevelopment; or 6 c. To verify compliance with Collier County Code of Laws and Ordinances 7 section 90-41(f)(8). 8 4. Stormwater management criteria. 9 a. Drainage plan criteria. A drainage plan shall be required for the following: 10 lots with 30 percent or less impervious area; lots within the Estates 11 zoning district with less than 20 percent impervious area, and; any lot 12 that has been permitted by the South Florida Water Management District 13 for Surface Water Management or Environmental Resource Protection. 14 The drainage plan shall demonstrate thefollowing: 15 i. Surface water discharges shall be'directed into one or more of the 16 following: 17 a) An existing surface water manao: ent system. 18 b) A drainage conveyance system. . 19 c) On-site retention or detention areas?`'`,-, 20 ii. Compliance with LDC section 6.05.01 C regar rid gutter and 21 downspout requirements.if applicable. 22 iv. The location, dimension, and setbacks of septic systems, if 23 applicable. 24 v. Drainage plans shall be prepared by a Florida registered design 25 professional or licensed contractor. 26 b. Stormwater plan criteria. A stormwater plan shall be required for the 27 following:tots with more:,than 30 percent impervious area and lots 28 Estates lot .with more than 26 percent impervious area. The stormwater 29 plan shall dernstrate compliance with the following criteria. 30 31 32 Detailed stormwater plan criteria to be created through modifications to 33 the City of Naples stormwater plan criteria and could include standards 34 such,as 35 i. Water quantity calculations... 36 ii. Water quality calculations... 37 riii. Allowable discharge locations... 38 iv. Design criteria... 39 v. Li"' - f BMPs... 40 P- pared by PE... 41 **** ***.k***************************************:t************************** 42 43 c. Criteria when discharging directly to a waterbody. 44 46 Options for discharging to a water body: 47 1. Allowed with stormwater plan only. 48 2. Allowed with stormwater plan and drainage plan. 49 3. Allowed with stormwater plan and drainage plan if water quality talcs. 50 provided. 3 I:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Bold text indicates a defined term 1 2 5. Application submittal requirements. The Administrative Code shall establish the 3 submittal requirements for drainage plans and stormwater plans. 4 6. Inspection and maintenance. 5 a. Inspection. The subject property shall be inspected by the County for 6 consistency with the approved drainage plan. A certification of 7 compliance shall be submitted to the County by the plan designer prior to 8 an inspection. 9 b. Maintenance. The property owner shall maintain site qradinq and 10 drainage in accordance with the approved drainage plan. Future 11 improvements shall not modify the site in a.manner that will prevent 12 continued drainage of the site in accordance with the approved drainage 13 plan whether or not a permit was required for the improvement. 14 G. The design of the stormwater management system shall fully incorporate the 15 requirements of the Interim Watershed Management regulations of LDC section 3.07.00. 16 H. Street grades. Street grades must be determined in relation to the drainage facilities 17 for the subdivision and must not exceed four percent nor be less than 0.3 percent, 18 unless otherwise approved by the CountyManager or designee pursuant to section 19 10.02.04 of the LDC. Street grades must shown on the development plans by 20 direction and percent of fall on the road profi 21 I. Rainfall and runoff criteria. The system must b designed for"design floods" resulting 22 from rain storms and antecedent Conditions for atlsstem components in accordance 23 with current Collier County and outl` Florida Water Management District criteria. 24 1. Runoff coefficients. Existing land;usage will bconsidered for the selection of 25 proper runoff coefficients ' in the drainage basis involved, whether within the 26 subdivision or developmenr not 27 2. Lakes.Artificial lakes and retention basins proposed as part of a stormwater 28 retentionsystem for on-site water wateiiiiihagementmust be designed and shall be 29 consistent with other ordinances 11 regulations of Collier County, the state or the 30 region. All lakes will be set back fin‘abutting abutting roadways or intersections 31 pub g t to the design standards established in sections 22-106 through 22-119 32 of the • of Laws and Ordinances. 33 J. Stormwater outfel .,Stormwater runoff must be conducted to positive outfalls that can be 34 permanently maintained, practicably and legally. Outfalls to existing waterways, canals, 35 preserve or conservationareas ula s or storm sewers will be acceptable provided it can 36 be demonstrated through a professional engineering study to the County Manager or 37 designee that such receiving systems have adequate capacity to receive the proposed 38 quantity andtquality of the additional flow. 39 1. Side ditches or swales along public or private roads shall not be accepted as 40 suitable positive outfalls except as may be specifically accepted under the 41 provisions orate LDC by the County Manager or designee and by the Florida 42 Department of Transportation, if applicable. The storage of stormwater runoff in 43 other existing or proposed ditches or swales within a public or private right-of- 44 way will be permitted for volume storage when approved under South Florida 45 Water Management District design criteria, but will not be utilized to satisfy the 46 stormwater storage (quality) requirements of a development's master water 47 management system. 48 K. Major waterway. Improvement or establishment of major waterways and canals will be 49 developed in full accord with applicable stormwater management criteria. Engineering 50 data, criteria, and suitable calculations shall be submitted to the County Manager or 51 designee prior to approval of construction plans. 4 I:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Bold text indicates a defined term 1 1. Roadways over major waterways will be structures approved by the County 2 Manager or designee, sized to maintain flow capacity, designed to assure long 3 life and minimal maintenance. Construction must meet all current Florida 4 Department of Transportation Standard Specifications for Road and Bridge 5 Construction, as amended, unless otherwise approved by the County Manager or 6 designee pursuant to section 10.02.04 of the LDC. 7 L. Outfall ditches and open channels. Unless otherwise approved by the County Manager 8 or designee pursuant to section 10.02.04 of the LDC, side slopes no steeper than four to 9 one will be allowed. Protection against scour and erosion will be provided as required by 10 the County Manager or designee. 11 M. Roadside swales. 12 1. Design. In the interest of preserving the existing natural groundwater levels, 13 roadways will not be designed so as to cause the significant lowering of the water 14 levels existing in the area prior to development. Roadside swales and ditches 15 may be permitted within street rights-oilay where the use of roadside swales 16 can be justified to the County Manager or designee through a written report 17 prepared by the applicant's professional engineer. Swales, where permissible, 18 will have side slopes no steeperthan four to one and they will not be utilized to 19 satisfy the stormwater quality(voe) requirements of a project's master water 20 management system.Where flow velocities in excess of four feat per second are 21 anticipated, urban right-of-way sections will be required. 22 2. Erosion protection. All unpaved areas within permanent right-of-way must 23 be provided with permanent erosion protect such as native vegetation or 24 turf. Swale ditches shall ba sodded a lateral distance extending from the road 25 pavement to the top of the swale ditch backslope. Where valley guttered sections 26 are usedi drain geways, turf protection must be placed from the edge of the 27 gutter Willa outer limits of the-right-of-way. If seeding is utilized, then mulching 28 in accordance with the Florida Department of Transportation standards will be 29 required.Additionally, if seeding and mulching are utilized, then a strip of sod one 30 foot wide will be placed along the fate of the pavement or curb section and over 31 the invert of any aPProveitt swale section within the runoff flowway. All swales 32 subject to erosion velocities willhave adequate erosion protection in the form of 33 riprap or other applicable like methods. 34 3. Driveways across swale ditches. Driveways across permitted swale ditches 35 • °-must have placed beneath them drainage pipes of adequate size and type 36 approved by the County Manager or designee, based on the capacity 37 requirementscalcu ted by the applicant's professional engineer for the 38 development's master water management system. 39 N. Street drainage. Street drainage within the road right-of-way through grassed swales 40 will be permitted for,rural cross sections only except where velocities in excess of four 41 feet per second are anticipated. The flow from these swales or other types of drainage 42 facilities will be diverted to natural percolation areas, artificial seepage basins or 43 artificial lakes of at least sufficient capacity to comply with the criteria of Collier County 44 and the South Florida Water Management District. Other equally effective methods of 45 returning cleansed waters to the aquifer will be acceptable upon prior review and 46 approval by the County Manager or designee. 47 1. Existing natural lakes may be used as detention areas provided that they have 48 adequate storage capacity and that pretreatment measures approved by the 49 County Manager or designee are taken to prevent pollutant matter from entering 50 the lake. Positive outfall drainage facilities will be provided away from all 51 percolation areas, seepage basins, detention areas and artificial lakes to handle 5 I:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Bold text indicates a defined term 1 the runoff from storms which exceed the required design storm event in duration 2 and/or severity. 3 0. Percolation areas. The actual area required will depend on the percolation rate for the 4 soils at the specific site and the manner in which the site is developed in accordance 5 with Collier County and South Florida Water Management District criteria. 6 1. Underground drainage. Where drainage plans provide for, or it is so directed by 7 the County Manager or designee, the collection of stormwater in underground 8 pipes, inlets and other appurtenances for conveyance to an intermediate or 9 ultimate outfall, the following minimum design criteria will be observed: 10 a. The minimum pipe used within a publicly maintained stormwater 11 collection system will be 15 inches in diameter. 12 b. Inlets will be spaced at such intervals ain such a manner to allow for 13 the acceptance of 100 percent of the teyear, one-hour storm runoff. 14 c. The distance between terminating and intermediate structures must not 15 exceed those required by the Florida Department of Transportation, 16 pursuant to Florida Department of Transportation Drainage Manual, 17 Volumes 1-4 (1987 edition or latest revision). -., 18 d. The stormwater, underground collection system, must be so designed 19 that the elevation of the hydraulic gradient during a ten-year, one-hour 20 storm event is never higher than the crown elevation of an publicly 21 maintained roadway in the system. 4 22 e. The pipes must be designed to minimize sediment deposits. 23 f. The pipe maters must meet the requirements set forth in sections 24 943-948 inclusiveof the,current editioti 'the Florida Department of 25 Transportation Standard Specifications for Road and Bridge Construction. 26 Only concrete pipe or other pipe materials approved by the County 27 Manager or designee may be used in tidal or salt waters. 28 g. Alt drainage pipes must be fled with headwalls, endwalls, inlets and 29 other appropriate terminating and intermediate structures. 30 P. Stormwater disposal. The methog of ultimate disposal of stormwaters will be dependent 31 uponhest it characteristioditd4rlYthit,pe development or subdivision. All stormwaters 32 will be subjected to treatment for the removal of petroleum residues, oils, suspended 33 solids and other _rn pollutants=ft��d in stormwater runoff. The method of treatment will be 34 determined by theTapplicant's professional engineer responsible for the preparation of 35 the stormwater management plans and specifications, and will be subject to the approval 36 of the County Manager or_designand the concerned state agencies. 37 # # # -, # # ; # # # # # # # # 6 I:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Strikethrough text is current text to be doloted Bold text indicates a defined term Collier County Land Development Code I Administrative Procedures Manual Chapter 4 /Administrative Procedures 4.M. Drainage Plan Reference LDC subsection 6.05,01 F. Applicability This procedure applies to single-family and two-family dwellings,and duplexes that meet the applicability criteria established in LDC section 6.05.01 F. Pre-application A pre-application meeting is not required. Initiation The applicant files a"Drainage Plan Application"with the Planning&Zoning Department in conjunction with the Building Permit application. Application Submittal Credentials:The drainage plan,as described below,shall be prepared by a Contents Florida registered design professional or licensed contractor.The name and contact information of the person who prepared the drainage plan shall be included on the document. The application must include the following: 1. A aplicant contact information. 2. Property information, including: • Address of the subject property; • Zoning of the subject property;and • Description of the proposed activity. 3. The drainage plan shall demonstrate the following: • Property boundari . • Lot area. • Property setbacks. • Finished floor elevation of the subject property. • Elevation of adjacent properties at the property line. • Location and area of all surfaces that prevent the percolation or absorption of water into the ground on the site. • Septic system location,dimensions,and setbacks,if applicable. • Proposed drainage directional arrows. • Location and type of all drainage infrastructure. • Cross-sections illustrating proposed grading and drainage infrastructure, including but not limited to: berms,walls,swales,pipes,gutters and downspouts,or other drainage facilities. 1. Any additional information related to the subject site, impervious areas,or drainage requested by the County Manager or designee. 7 I:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx Text underlined is new text to be added Bold text indicates a defined term Collier County Land Development Code I Administrative Procedures Manual Chapter 4 I Administrative Procedures Completeness and The Planning&Zoning Department will review the application for completeness.After Processing submission of the completed application packet accompanied with the required fee,the applicant will receive a mailed or electronic response notifying the applicant that the petition is being processed.Accompanying that response will be a receipt for the payment and the tracking number(i.e.,XX201200000)assigned to the petition.This petition tracking number should be noted on all future correspondence regarding the petition. Notice No notice is required. Public Hearing No public hearing required. Decision maker The County Manager or designee. Review Process The drainage plan will be reviewed by the Planning: Zoning Department as a part of the Building Permit application. Updated • 3V mss•. ,:,, 441444'• 8 l:\2016 LDC Amendment Cycle\Amendments\6.05.01 Lot Coverage\Drafts\6 05 01 Water Management Requirements 10-17- 16.docx r ?ajr5444. Fourth Draft: July 2007 STORMWATER STAN DARDS HANDBOOK Adopted Pursuant to Ordinance 07-11807 City of Naples Stormwater Standards Handbook TABLE OF CONTENTS SECTION PAGE Sec. 1: ORDINANCE 3-6 Sec. 2: PURPOSE & INTENT ...7 Sec. 3: DESIGN STANDARDS&REFERENCES .8-9 Sec. 4: BEST MANAGEMENT SELECTION CRITERIA 10 Sec. 5: SUBMITTAL REQUIREMENTS 11 Sec. 6: PLAN REVIEW &APPROVAL PROCESS 12 Sec. 7: CONSTRUCTION INSPECTION & APPROVAL PROCESS 13 Sec. 8: SAMPLE APPLICATIONS & CALCULATIONS 14-37 SECTION 1: ORDINANCE Agenda Item 8 Meeting of 10117/07 ORDINANCE 07-11807 AN ORDINANCE REGARDING STORMWATER; AMENDING SECTION 16-51, DEFINITIONS, FOR THE PURPOSE OF ADDING DEFINITIONS FOR SPECIFIC DRAINAGE TERMS; AMENDING SECTION 18-114, SUBMISSION OF SIDEWALK, STREET AND PROJECT SITE DRAINAGE AND DRIVEWAY PLANS, FOR THE PURPOSES OF REQUIRING PERIMETER WALLS;ADDING SECTION 16-115,STORMWATER CONSTRUCTION STANDARDS, FOR THE PURPOSE OF ESTABLISHING STORMWATER CONSTRUCTION STANDARDS; CODE OF ORDINANCES OF THE CITY OF NAPLES; PROVIDING A SEVERABILITY CLAUSE; PROVIDING A REPEALER PROVISION; AND PROVIDING-AN EFFECTIVE DATE. WHEREAS, Section 16-114 and Section 16-291 of the Code of Ordinances of the City of Naples requires new construction to provide a surface water management plan, provide for proper grading, provide for stormwater discharge to a water management system, provide for the control of water discharge to protect abutting property; and WHEREAS, the City of Naples Comprehensive Plan identifies the 5-year, 1-hour storm event as the recommended level of service goal for conveyance systems in the City of Naples and identifies the SFWMD Criteria as the recommended level of service goal for meeting water quality standards in the City of Naples;and WHEREAS, there is a need to adopt specific standards and details to guide the development community to ensure the proper design and installation of stormwater facilities, grading techniques, and development practices to ensure that the applicable provisions of the current Naples Code and goals of this ordinance are met;and WHEREAS, there is a need to control stormwater from new developments, re-developments and substantial improvements by meeting goals defined herein as: GOAL "A" — To prevent adjacent and downstream property from experiencing erosion, surface flooding,or groundwater seepage; GOAL"B"—To ensure a reasonable level of water quality treatment of stormwater prior to discharge to downstream stormwater management systems;and WHEREAS, to provide reasonable flexibility and Incentive based options so that the development community can be innovative in meeting the GOALS stated above, the City encourages the use of the latest Best Management Practices (BMPs) and Low Impact Development (LID) approaches as defined by the State of Florida; and WHEREAS, specific stormwater standards for conveyance and water quality have been drafted as being in the best interest of the public for protection of public facilities and private property;and WHEREAS, on May 9, 2007, the Planning Advisory Board reviewed a prior proposed amendment and recommended by vote of 7 to 0,that City Council adopt the proposed amendments; NOW,THEREFORE,BE IT ORDAINED BY THE COUNCIL OF THE CITY OF NAPLES,FLORIDA: Section 1. That Section 16-51 of the Code of Ordinances of the City of Naples, Florida,is hereby amended to read as follows(with underlining indicating additions and strikeout indicating deletions): • Sec. 16-51. Definitions. The following words, terms and phrases, when used in this article, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning: Accessory structures (type 1) are nonhabitable structures that normally have a roof and a measurable floor area,or ground surface area,e.g.gazebos, sheds,detached garages,chickees, boathouses, swimming pools,etc. Accessory structures (type 11) are nonhabitable structures that usually do not have a roof and a measurable floor area, e.g.fences,signs, driveways, sidewalks,exterior screen walls,etc. Commercial means all other occupiable areas that are not classified as residential, including multifamily residential. Detention Facility is a facility used to temporarily store stormwater runoff and rainfall that recovers its storage volume by the controlled release of water through designed drawdown structures and mechanisms (see "Retention Facility"for contrast) Gross square footage is the total square footage of the structure measured to the outside of the exterior walls, or column lines where there are no walls. This is the same as the building footprint. Where the structure contains multiple floors(stories),the gross square footage is calculated to include the area of all floors(stories). Impact fees are charges assessed and collected on newly developed property by local governments. The intent of the fee is to recover the cost incurred by providing public amenities required for the new development. Impermeability is the relative inability of a material to allow the flow of water to pass through the material, typically associated with solid surfaces that prohibit rainfall or both rainfall and rainfall runoff from entering and passing through the material. Impervious means impenetrable or impermeable by water. Impervious area means the percentage of the lot land area covered by impervious surfaces such as buildings or structures, swimming pools, decks, lanais, patios, driveways, and also includes any surface covered by concrete, bricks, blocks. flagstones, paving, sealant, or any other impermeable material. Standard engineering coefficients of permeability shall be used for partially pervious materials. Occupiable areas are, for the purpose of this article, defined as any enclosed space that can be occupied by humans. This would include every square foot of floor area under the same roof of residential and commercial buildings computed to the outside of the exterior walls, or column line for areas without exterior walls, of the structure. In a residential structure this would include attached garages,carports,storage rooms,etc. Paved areas are any exterior areas covered with human-made or natural materials to provide a walking or vehicle traversing surface as opposed to real grass or other vegetation. Materials could include but shall not necessarily be limited to concrete, asphalt, brick, stone, and astro-turf type surfaces. Penalty fees are additional fees imposed upon'the project for failure to comply with some requirements of this article. Permit fees means monies collected for the processing of permits and operation of the building and zoning division. Plan review fees are fees collected at the time an application for a permit is submitted to the building and zoning division to cover the cost of reviewing the plans and specifications for code compliance. This fee will be charged for all construction projects involving habitable structures and accessory structures where plans have to be submitted. Residential means 1-or 2-family units of occupiable areas. Retention Facility is a facility used to store stormwater runoff and rainfall that recovers its storage volume only when the water evaporates,transpirates,or percolates from the facility. Re-development is any construction activity on a site where the aggregate of actions and/or costs to reconstruct. modify, alter, or improve the property, whether in one phase or in multiple phases, are anticipated to do any of the following: (1) increase the appraised value of he property more than 50% of its current appraised value: (2) replaces the existing building or reconstructs more than 50%of the area under existing roof; (3) raises more than 50% of the existing finished floor; or (4) modifies the existing site grading sufficiently to warrant concern that the new activities could create problems for offsite or adjacent property. Surcharge fees are additional fees imposed by some level of government to be used for some specific purpose. Temporary use permits are permits issued for special activities or events that do not meet local zoning requirements. These permits are issued for a specific time period determined by the building official based on the applicant's request. Section 2. That Section 16-114 of the Code of Ordinances of the City of Naples, Florida, is hereby amended to read as follows(with underlining indicating additions): Sec. 16-114.Submission of sidewalk,street and project site drainage and driveway plans. No building permit shall be issued for any building in the city unless a site plan is submitted with the application for such building permit illustrating the location of driveways, sidewalks if required by ordinance, parking strips consistent with this Code and perimeter retaining structures or a surface water management plan which provides for containment of runoff on-site with surplus routed to rights-of-way or right-of-way swales for drainage as applicable. Section 3. That Section 16-115 of the Code of Ordinances of the City of Naples, Florida, is hereby added to read as follows(with underlining indicating additions): Sec. 16.115 Stormwater construction standards. (a)Any new development,redevelopment or substantial improvement of platted properties within the City of Naples shall be reviewed to assure compliance with the following minimum stormwater design criteria: LAND USE CONVEYANCE/QUANTITY STORAGE/QUALITY (GOAL "A") (GOAL"B") Single Family (A) (B) Multi-Family (A) (B) Non-Residential/ Mixed Use (A) (B) TECHNICAL,CRITERIA NOTES: (A) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District criteria, a storm event of a one-hour duration and 5 year return frequency shall be used in computing the minimum off-site discharge rates from private properties to the City's stormwater system. The stormwater conveyance system should be designed sufficiently so that the conveyance shall pass the design flow while ensuring that the backwater head does not exceed the proposed berms, walls or other containment systems in a twenty five year--24 hour storm event. The side lot swales and other emergency conveyance facilities may be designed to pass the water forward to the Public Right of Way. (B) Unless otherwise specified by previous South Florida Water Management District(SFWMD)permits or District criteria,water quality standards shall be determined based upon selecting the most appropriate pollutant removal presumption to the corresponding BMP technique. The BMP guidelines used must meet a presumed pollutant removal of 85% Total Suspended Solids (TSS). Total Nitrogen (TN), and Total Phosphorus(TP). BMPs that do not effectively remove TN and TP such as"dry detention"will be discouraged. Innovative approaches and LID techniques that reduce percent impervious are encouraged. Although reductions in storage volume may be given to BMPs that use "retention" and exfiltration.under no circumstances will the design storage volume be allowed to be less than half inch (0.5")of retention storage volume nor less than 1.25 inch of dry detention storage volume (based on total site area). The following special conditions shall apply in meeting the above standards: a) on single family lots no more than one-half inch of detention or retention shall be stored underground in vaults, exfiltration pipes, or french drains; b) rainfall runoff from roof drains can be disregarded from the water quality calculations (GOAL"B") but not from the conveyance calculations (GOAL "A") since roof water is not a major source of pollutant concern but it is a major concern for release into the public system for flooding considerations. Directly connected impervious area (DCIA) is discouraged for purposes of GOAL "A". c) retention systems shall be designed and located no less than 18 inches above the wet season water table; exfiltration and pervious pavement shall be designed to be a minimum of 24 inches above the wet season water table; d) where special filtering materials are utilized, where swimming pools and patio areas are designed for storage or where special retention provisions are provided consistent with SFWMD criteria or consistent with Chapter 62 of the Florida Administrative Code, the building official may credit such areas in the computation of total on-site storage. (b) All implementation of stormwater improvements shall conform to the above standards and shall include compliance with the following special criteria: (1) Plans and specifications signed and sealed by an appropriate design professional shall be submitted for review and approval prior to the issuance of City permits. Upon completion of the construction of stormwater improvements and prior to receiving a certification of occupancy or completion, a certification with record documents shall be submitted by the design professional stating that the work has been satisfactorily completed in accordance with the plans and specifications. (2) Establishment, re-establishment or maintenance of swales within the abutting City street right-of-way in accordance with the City's Right-of-Way Standards Handbook. (3) Prohibition of stormwater discharge into a platted alley unless a drainage conveyance system exists within the alley with sufficient surplus capacity to handle the quantity of runoff proposed for discharge to the alley. (4) Roof gutters are required as an erosion control technique that also follows the philosophy of reducing DCIA and shall be installed on all buildings. However, in special cases,where the side yard widths are greater than 10 feet, the building official may allow an exemption as long as the roof directs less than 25% of the roof runoff to a side yard area, and erosion control is adequately addressed. (5) Streets, driveways and sidewalks shall be designed to minimize potential for increasing the runoff from private property to the City's stormwater system. (6) The property owner shall maintain the stormwater system in accordance with the stormwater plan certified at the time of issuance of a certification of occupancy. The building official reserves the right to reject any BMP or innovative technique proposed to meet the goals of the ordinance if the applicant does not provide adequate assurances through a maintenance plan that the system will be effectively maintained in perpetuity. (c) The environmental protection of downstream water bodies is vital to this ordinance as part of GOAL"A". In rare instances where an existing property has elevations that will not grade back into the required stormwater master system.then as a minimum, the City requires some form of pretreatment before discharge to the canal, lake, bay or other water body. Innovative BMPs shall be employed to accomplish this including (but not limited to): interceptor swales, containment berms, rain gardens and interconnection into the seawall rock drain system. SECTION 2: PURPOSE & INTENT 1. This Stormwater Standards Handbook (hereinafter referred to as "Handbook") was developed with the express intent of guiding the community in the implementation of the City's Ordinance of stormwater requirements for all new construction. The general goals of the stormwater requirements are to assure protection of adjacent properties during and after re-construction and new construction within the City's corporate limits and to improve the water quality of stormwater runoff. In the implementation of these requirements over time, there will be added community benefits in areas of stormwater conveyance within the City system by improved control of runoff within the City's swale system, reduced staging of rainfall runoff within the City's swale system, increased retention systems on private property with more runoff percolating into the ground water, improved pre-treatment of runoff on both public and private property and potentially reduced staging elevations of rainfall-runoff from specific storm events. 2. The City of Naples stormwater ordinance and implementation thereof is generally intended to meet the following: a. Preserve the interest of public health, safety and welfare; b. Protect existing public and private stormwater facilities from damage; c. Maximize the ease and effectiveness of long-term stormwater maintenance and operations by the City and other parties; d. Minimize the cost burden of long-term stormwater maintenance and operations; e. Avoid or minimize adverse environmental and drainage impacts to public and private lands; f. Preserve the level of service and integrity of the City's stormwater systems; and g. Provide for best management practices (BMP) of stormwater facilities in the future development of property in the City's. 3. Accordingly, the purpose of this Handbook is to provide standards, procedures, and requirements for implementation of the stormwater ordinance in the best interest of the public and for the protection of public and private property. 4. Revisions to this Handbook shall be at the discretion of the City of Naples City Council upon the recommendation of the City's Public Works Director with advertised notifications to the public as may be required by law. 5. This Handbook, inclusive of attached drawings, illustrations and all specified standards and specifications may be amended and supplemented in content and frequency in the best interest of the public. SECTION 3: DESIGN STANDARDS & REFERENCES Stormwater plans shall be prepared to meet the standards established in the Stormwater Ordinance with the engineering design and plans for proposed stormwater improvements conforming with the most current editions of the following standards, adopted by reference herein: i. Rules and regulations by the South Florida Water Management District, the Florida Department of Environmental Protection and related state and federal agencies. ii. City policies, standards and specifications such as the City of Naples Right-of- Way Standards and the Utilities/Engineering Manual of Standards and Specifications for water, sewer and reclaimed water mains. iii. State of Florida Department of Transportation (FDOT) Design Standards For Design, Construction, Maintenance And Utility Operations on The State Highway System. iv. Florida Accessibility Code. v. FDOT Manual on Uniform Minimum Standards for Design, Construction and Maintenance for Streets and Highways. vi. FDOT Standard Specifications for Road and Bridge Construction. vii. Operating and maintenance policies and standards established by the City's Public Works Director and Community Services Director. viii.Operating standards and/or procedural processes established by resolution by the City of Naples City Council. ix. Applicable City of Naples subdivision regulations. x. City of Naples Comprehensive Plan. xi. Manual on Uniform Traffic Control Devices (MUTCD) latest edition, published by the U.S. Department of Transportation. xii. FDOT Utility Accommodation Manual. xiii.Other pertinent technical literature or documents representing professional standards of practice in various design disciplines. a. In the event of a conflict between two or more of the reference documents listed in above or amongst any other design documents or references, the more restrictive provision or document shall apply and remain in full force and effect. If engineering design criteria or construction standards for construction of a proposed Facility or improvement are not explicitly contained in said reference documents or if unique or special circumstances warrant, the Public Works Director and/or his assignee is directed to include necessary supplemental provisions or regulatory requirements as part of special permit conditions or stipulations which shall then become a formal attachment to a right-of-way construction permit. Moreover, at the discretion and sole authority of the Public Works Director and/or his assignee, special permit conditions or stipulations may require entry into a formal agreement to be executed by the City of Naples City Council to ensure that public property such as drainage infrastructure, utilities and other Facilities are afforded the highest level of adequate protection and are modified or expanded appropriately for the safe operation and maintenance of the public stormwater systems and other public infrastructure as may be appropriate. SECTION 4: BEST MANAGEMENT SELECTION CRITERIA Proposed_BMP Selection Credits Additional BMP Measure Utilized Proposed Justification Explanation Credit 1 Common Swale on Joint Lot Line 1.0 SC Grading disparities between properties and minimal distance between side setbacks result In difficult to construct an efficient stormwater treatment system that are difficult to maintain.Any property owner that can negotiate and develop a common male between two lot lines provides a typically superior to maintain, problem free solution that can remove pollutants with a high efficiency as well as carry on-site stonnwater in an easter to maintain technique than underground vaults and pipes. 2 Home Roof Drains Connected Directly to 1.0 SC Because of FFE Requirements most new homes are well above the crown of the Swales or 6dittration(making roof roadway and driveways have steep slopes where ail impervious pollutants drain NDCMA) into Public Right-of-Way with little treatment.Valid techniques,such as pervious concrete,geoblocka,and other innovative landscape architectural techniques that decrease the impervious runoff and allow for some percolation will provide credits. 3-Pervious Driveway Driveways that are made of pervious materials that allow percolation wilt be given •Flat(,!2%slope) •1.0 SC BMP credits.Their effectiveness is directly related to driveway slope ■Med(2%>5%slope) •0.5 SC •Steep(?5%slope) •0.0 SC 4 Driveway Trench Drain 0.5 SC The slope of driveways usually do not avow for reverse grading to treat on-site,thus substantial portions of impervious area go to the street untreated.Credit will be given to effective use of Intercepting trench drains. 5 Driveway Runoff Collection-"Rain 1.0 SC Most driveways slope toward the roadway and convey runoff directly Into the street Gardens" without providing any treatment,A depressed landscape area located adjacent to the driveway will be encouraged through BMP credits. 6 Loop Driveway Inverted"Rain Gardens" 1.0 SC Most looped driveways utilize a raised landscape area that reduces potential (instead of raised Islands) treatment area from the very Important low portion of the lot where driveways need treatment.A depressed landscape area in these locations will be encouraged through BMP credits. 7 Pool and Deck"Self Containment" 0.5 SC Designing pool deck area to shed the runoff back to the pool instead of generating Design additional stormwater runoff will be rewarded with BMP credits. 6 Native Landscaping That Does Not '1.0 SC Landscaping documented to be Florida native apexes compatible with local native Require Fertilizers/Pesticides soils will be presumed to not require special watering,fertilizing,and pesticide needs that waste water and generate pollutant runoff thus BMP credits may be assessed. 9 Home Roof Drain Fitted with Rain 0.5 SC Most roof drains are connected to the general conveyance of the property to direct Barrels the runoff immeddately offsite following a storm event.A rain barrel intercepts this runoff to be used for Irrigation purposes during times with lower rainfall therein preserving potable water and ifs use will credit BMP's. SECTION 5: SUBMITTAL REQUIREMENTS For the development of platted properties in the City of Naples, the following stormwater information shall be submitted as part of building and/or site development permitting: PROPERTY INFORMATION: 1. Property survey (purpose: confirm location, existing conditions/improvements, corner monuments, easements, flood zone, FIRM, etc.) 2. Boundary& ROW survey (purpose: confirm adjacent properties, ROW information, etc.) 3. Topographic information (purpose: confirm land contours for site, adjacent properties, ROW and downstream drainage flow/outfall). 4. Site plan of proposed building improvements with directional allocation of roof runoff. 5. Soil survey information to confirm water table and previous nature of soil layers. DRAINAGE CONVEYANCE INFORAMATION: 6. Drainage conveyance routing sketch showing site runoff directions and runoff percentages. 7. Drainage conveyance capacity analysis calculations based on the developed site using the 25-Year/1-Day storm event (8.5 inches over 24-hours [hydrograph mass distribution to be provided for the peak in terms of discharge rate and elapsed time]). 8. Drainage calculations on total rainfall-runoff(purpose: determine capacity of conveyance system to handle total runoff and identify backwater elevation data). 9. Drainage calculations for maximum staged elevation, and design containment system for this elevation (purpose: collection & conveyance system shall prevent discharge onto adjacent property. DRAINAGE STORAGE/WATER QUALITY INFORMATION: 10.Site drawing of the planned project confirming the pervious and impervious areas and the relative imperviousness for type detention and/or retention systems (purpose: identify the type of water quality treatment, applicable BMP and capacity) 11.Water quality storage calculations for initial runoff and for selected BMP (minimum thresholds:1/2 inch for retention and/or 1% inch for detention or other over the entire site). 12.Stormwater storage capacity calculation for stormwater system (purpose: confirm design meets City code) Project contractors shall be held responsible to provide engineering designs and related designs that meet professional standards of practice and review processes as designated herein. Review and inspection fees as may be established by City Council shall be paid upfront as part of the plan submittal process. SECTION 6: PLAN REVIEW & APPROVAL PROCESS Subject: For the development of platted properties in the City of Naples, the following stormwater design criteria, plan submittal and approval process will be relied upon for building and/or site development permitting: DESIGN REVIEW CRITERIA: 1. Effective December 17, 2007, all plans submitted to the City shall be reviewed for compliance with Stormwater Ordinance 07-11807. A maximum of two-weeks shall be allocated the review period. 2. Design criteria for review are as set-forth in the SFWMD, FDEP, FDOT and City of Naples standards. 3. Examples of typical standards are outlined as follows: a. Minimum subsurface pipe size: 8" b. Minimum yard slope: 2% c. Maximum yard slope: 8% unless stabilized d. Minimum pipe slope: Not applicable pending BMP e. Drainage materials: reference City standards f. Underdrain design: reference City standard g. ROW Swale design: reference City standard h. Gutter Size: minimum commercial width of 7" on all roof lines within 10 feet of property lines. i. Drainage materials: reference City standards j. Underdrain design: reference City standard k. ROW Swale design: reference City standard I. Gutter Size: minimum commercial width of 7"on all roof lines within 10 feet of property lines. SECTION 7: CONSTRUCTION INSPECTION & APPROVAL PROCESS Subject: For the inspection and approval of permitted building and/or site improvements, the following outline of inspection, certification and approval will be followed: INSPECTION & CERTIFICATION 1. All connections to the City stormwater system shall be subject of inspection by the City. 2. All stormwater system components shall be inspected by the City prior to landscaping and irrigation installation. 3. Critical site work to include size, cross-section and elevation shall be confirmed both by on-site inspection/certification and submittal of record drawings at the completion of work. Final approvals and/or issuance of certificates of occupancy by the City shall not be processed until this verification is provided and confirmed. SECTION'8: SAMPLE APPLICATIONS & CALCULATIONS DESIGN EXAMPLES-LOT SUMMARY • Design Example Problem Lot Summary Assumed Assumed Sample Ground Estimated Roadway 10-Yr High 100-Year Assumed Parcel ID LotAdress Basin Depth to ESHWT Tidal Flood Applicable Lot Elevation ESHWT Center Line Elevation BFE FFE (NAVD) (NAVD) 1 14006040005 1 Broad Ave S III 6.0 -2.0 4.0 4.5 4.1 12(AE) 13.0 2 12962240002 533 Ketch Dr I 10' -6.0 4,0 7,0 4.1" 10(AE) 11.0 to X500 3 08930080008 1962 Gulf Shore Blvd S IV 5.5 -2.0 3.5 4.5 4.1" 16.0 ) 13.0 4 01780520003 675 17th Ave S IV 4.5 -1.0 3.5 4.5 4.1" 1/.0(AE) 12.0 •NOTE:The Structures surveyed in Basin I do not have sufficient elevation information to determine approximate existing ground elevation,therefore USGS 5'Contour Map used. "NOTE:The Tidal elevations are only explained In the Updated Master Plan for Basins III,V,and Vf. They ere a1 the same elevation. Design Example Problem Lot Summary(cont..) Sample Front Lot Side Lot Rear Lot Typical Max Pool Lot Parcel IC Lot Adress ZONING Setback Setback Setback Pool Height Height"' 1 14006040005 1 Broad Ave S R1-10 SF 30.0 7.5 25.0 7.0' 10.5 2 12982240002 533 Ketch Dr R1.10 SF 30.0 7.5 25.0 9.5 13.0" . 3 08930080008 1962 Gulf Shore Blvd S R1-10 SF 30.0 7.5 25.0 7.0 10.5 4 01780520003 675 17th Ave S 111-10 SF 30.0 7.5 25.0 7.0 10.5 "'NOTE:Sec.56-45 Pools-(6)Height-May not exceed 30-inches above the crown of the roadway.Additional Six inches of height can be added for every 12-inches of horizontal distance permitted from either the side or rear property line,whichever Is closer,up to a maximum height of 6-feet(72-inches) fixl e' IlISrI kl3td 4, f, d ; , o ♦ '1 14 : 4 , . i .0 iYi . hry5'''I[)tR ,.. sS P!d TREATMENT VOLUME REQUIREMENT Sample Lot I -Alternative 9 Description: Use the minimum 7.5'sidelof setbacks, use minimum height containment wall,pool with screen enclosure, and textured impervious driveway Ordinance 07-11807-Sec.16-115 Storm water Construction Standards CONVEYANCE/ STORAGE/QUALITY LAND USE QUANTITY (GOAL"B") (GOAL"A") Single Family (A) (B) Multi-Family (A) (B) Non-Residential/Mixed (A) (B) Use TECHNICAL CRITERIA NOTES: (A) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District Criteria, a storm event of a one-hour duration and 5 year return frequency shall be used in computing the minimum off-site discharge rates from private properties to the City's stormwater system. The stormwater conveyance system shall pass the design flow while ensuring that the backwater head does not exceed the proposed berms,walls or other containment systems in a twenty five year-24 hour storm event. The side lot swales and other emergency conveyance facilities may be designed to pass the water forward to the Public Right of Way. (B) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District Criteria, water quality standards shall be determined based upon selecting the most appropriate pollutant removal presumption to the corresponding BMP technique. The BMP guidelines used must meet a presumed pollutant removal of 85% Total Suspended Solids (TSS), Total Nitrogen (TN), and Total Phosphorus (TP). BMPs that do not effectively remove TN and TP such as "dry detention" will be discouraged. Innovative approaches and LID techniques that reduce percent impervious are encouraged. Although reductions in storage volume may be given to BMPs that use "retention" and exfiltration, under no circumstances will the design storage volume be allowed to be less than half inch (0.5") of retention storage volume nor less than 1.25 inch of dry detention storage volume (based on total site area). The following special conditions shall apply in meeting the above standards: a. On single family lots no more than one-half inch of detention or retention shall be stored underground in vaults,exfiltration pipes,or french drains; b. Rainfall runoff from roof drains can be disregarded from the water quality calculations (GOAL "B") but not from the conveyance calculations (GOAL "A") since roof water is not a major source of pollutant concern but it is a major concern for release into the public system for flooding considerations. Directly connected impervious area(DCIA)is discouraged for purposes of GOAL"A". c. Retention systems shall be designed and located no less than 18 inches above the wet season water table;exfiltration and perilous pavement shall be designed to be a minimum of 24 inches above the wet season water table; d. Where special filtering materials are utilized, where swimming pools and patio areas are designed for storage or where special retention provisions are provided consistent with SFWMD criteria or consistent with Chapter 62 of the Florida Administrative Code, the building official may credit such areas in the computation of total on-site storage. Preparedby Frit, TETRATECH PPP:1200-0516-08003-NAPLES STORM WATER MANUALISupportDocs\CalcslNaples-Stormwater Manual-Lot 1 Alt 1.XLS 1 of 5 tll d • ui r f q o>}. ' y. l t 111 1 6� �I d �..• 1 3 u' }� t � ttp n l i,A►, G► Sample Lot 7 -Alternative I Proposed Lot Area Calculations Total Lot Area 11,250 sq-ft 0.26 ac Total Impervious 7,235 sq-ft 64% Imp.Roof Area 3,855 sq-ft 34% Imp.Non-Roof Area 3,380 sq-ft 30% Pervious Area 4,015 sq-ft 36% (necessary for Water Quality Calculations) Containment Area 7,190 sq-ft (necessary for Water Quantity Calculations) (A)CONVEYANCE/QUANTITY(GOAL"A") REQUIRED CONVEYANCE(GOAL"A") 1) Establish Minimum Discharge Rate[per Sec. 16-115(a)(A)) 5-year!1-hour storm event Peak discharge estimates may be calculated from the Rational Method(Q=CiA): Q= runnoff(cfs) C= runoff coefficient(dimensionless) I= rainfall intensity(in/hr) A=watershed area(ac) Note: a)Various publications have recommended values for C for both the undisturbed lot and the developed lot(i.e.ASCE Manual of Practice No. 37, 1970) [most undeveloped lots in Naples will range between C=0.2 and C=0.4] b)The runoff coefficient,C, for the developed, or post, condition will require a composite runoff coefficient calculation.This calculation is: Composite=(Cpervioua*%Pervious)+(Clmervious i%Impervious) c)The rainfall intensity can be determined from Rainfall Intensity-Duration-Frequency Curves published for the State of Florida(Collier County is located in Zone 8)and are a factor of the Time-of-Concentration(minimum value of 10-minutes). [most lots in Naples will use i5yr=6.9(in/hr)which assumes a Tc of 10 minutes] For Design Example SLI-ALT1: Cpo5T= 0.69 (0.3*36%)+(0.9"64%) 15yr= 6.9 in/hr A= 0.26 ac ()POST= 1.22 Itis Minimum discharge rate required from the developed lot: 1.2-cfs Need: 1 Pipe to convey 1.2-cfs • The City requires the exit velocity for residential properties to be greater than 1-fps but below 2-fps(unless otherwise approved by the City Engineer).Assuming the culvert used will be sized for the exit velocity. • 8-inch is the minimum outfall pipe size regardless of velocity. 1 -12-in HDPE will convey 1.2-cfs at a Velocity,V,of 1.4 fps 1-- 1 —1 -10-in HOPE will convey 1.2-cfs at a Velocity,V,of 2.0 fps (too fast) Select 12-in (single 12-in HDPE pipe to be used for discharge from lot to minimize erosion of roadside swaie) Prepared by :-Ib TETRA TECH P:1200-08516.08003-NAPLES STORM WATER MANUAL\SupportDocs1Calcs1Naples-Stormwater Manual-Lot 1 Alt 1.XLS 2 of 5 • • • • � � u-3y tsl� „.."T; 1IN� $� ' � i 1( e 1 lII' "4'1'01 F1'0 vilfl,{•l,i�,�{IItIsItt1sfr:. uk 'd 4 111 'n r "! Sam•le Lot 9 -Alternative I REQUIRED QUANTITY(GOAL"A") 2) Establish the conveyance system will sufficiently pass the Runoff Discharge Rate for 25-year/24-hour Storm without overtopping(per Sec. 16-115(a)(A)] Discharge rate estimates of the"Containment Area may be approximated from the Rational Method (Q=CIA): ()Containment= peak runoff from Containment Area(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) ^Containment= Containment Area(ac) The"Containment Area"(Aoontainment)is the area that will contribute to the runoff through the side lot swales and will need to overtop prior to discharge from the property For Design Example SL1-ALT1: Containment Area 7,190 sq-ft (necessary for Water Quantity Calculations) Pervious Portion 1,765 sq-ft 25% impervious Portion 5,425 sq-ft 75% CContainment= 0.75 (0.3*25%)+(0.9*75%) i25yr= 8.4 in/hr(from FOOT Zone 8 IDF Curve) ACantainmem= 0.17 ac QContainment= 1.04 cfs The approximate peak runoff rate from the containment area will be Qwntatnment•The"Maximum Containment Elevation"(MCE)of the property can be approximated from the Weir Equation (Q=Cy,LH ) ()Containment= peak runoff from Containment Area(cfs) Cw=weir coefficient(dimensionless) L= length of weir crest(ft) H= height of water over weir crest(ft) QContainment= 1.04 cfs Cw= 2.6 (dimensionless)sodded broad crested weir L= 3.00 ft H=I 0.05 ft I 0.6 finches The Maximum Containment Elevation of the property can be approximated by adding the Height of water over the Weir Crest(H)to the overflow elevation shown on plan view.The City requires 1'of freeboard from the MCE.Thus,from the sketch of SL1-ALT1 with weir elevation 7.5 the MCE=7.5+0.05=MCE=7.55 or 7.6 Prepared by [.Ib] TETRATECH P:1200-08516-08003-NAPLES STORM WATER MANUAL1SupportDocs\CalcslNaples-Stormwater Manual-Lot 1 Alt 1.XLS 3 of 5 997 } 1 1 r� i l 1 yf i i�� I� -Arr. (F ,) 1.i:e. 1 7 d i ) H( { �� 6 �m II 11 i ! I M� M 11 dr i i "~ arra:;" s�: �"f'd • I u°i r I �rA �.l;\ 41114140017 ? arT 1 .�alr 1� ,ra•� -- Sample Lot 9 -Alternative (B)STORAGE/QUALITY(GOAL"B") REQUIRED QUALITY(GOAL"B") 1)For Retention Storage(per Sec. 16-115(a)(B)]: (Total Lot Area-Imp. Roof Area)•1/2 inch of runoff For Design Example SLI-ALT1: 1) 308 ft3 4 (utilizing retention storage) Note: a)The Water Quality(GOAL"B")volume calculations exclude the roof covered impervious area per Sec. 16-115(a)(9)(b) b)The runoff from the driveway cannot be directed back towards the exfiltration gallery therefore a trench drain has been installed to discharge into a rain garden to collect and treat the pollutants for this problematic graded impervious area.The use of the trench drain and raingarden are encouraged BMP's.[approximately 1550-sf of the driveway can be intercepted by the trench drain] (Total Driveway Area draining to Rain Garden)• 1/2 inch of runoff b) 65 ft3 (utilizing retention storage) REQUIRED STORAGE(GOAL"B") 1)Maximum Underground Retention Storage[per Sec. 16-115(a)(B)(a)]: VMAx= Maximum Volume allowed to store underground(i.e. exfiltration) VMAx= Total Lot Area•1/2 inch of runoff For Design Example SLI-ALT1: 1) 469 ft3 Prepared by N't: TETRA TECH P:\200-08516-08003-NAPLES STORM WATER MANUAL\SupportDocs\Caics\Naples-Stormwater Manual-Lot 1 Alt 1.XLS 4 of 5 7 it I� � 1YJ'It f\ ,•,1,v,:,;,,i,.',. ; � L4� � y Tl `Ir II',, 1, {� .I 1 111777';'-!-;'>)0'i: ..' ' - ''' t 1,, ga I ,* t Sample Lot 1 -Alternative 1 PROVIDED STORAGE ON LOT 1)Storage through Underground Retention(French Dram) Pipe Data Pipe Diameter D 1.00 ft No.of Pipes # 1 Pipe Length L 140 ft Pipe Area Apipe 0.785 ft2 Apipe=[Tr(D2 l 4)[*# Volume in Pipe Vpipe 110 ft3 VPlpe=Ap;p *L Trench Data Trench Width w 2.00 ft Trench Height h 2.00 ft Trench Length L 140 ft Trench Area Atrenah 4.00 ft2 Avench=W*h Fillable Porosity f 0.50 Volume of Vold Space V, 225 lIft3 V8=(AVenut-Ap,pe)*f*L French Drain Volume Vtreneh 335 ft3 Vtrencb=Vo"+V8 2)Storage through Rain Garden Retention Stage Area Average Incremental Cumulative Area Volume Volume (ff) (Sq.Ft) (Acres) (Ac-ft) (Ac-ft) 4.5 96 5.0 150 123.17 61.58 62 _ 6.0 259 204.67 204.67 266 3)Storage within Conveyance Swale-the volume is too miniscule to gain credit in this example Total Total Required Provided Water Quantity(GOAL"A)5-year/1-hour 1.22 _ 1.40 cfs Water Quantity(GOAL "A")25-year/24-hour Containment 1.04 1.04 Water Quality(GOAL"B) 308 335 ft3 Underground Retention Storage(Max Allowable) 469 _ 335 ft3 Water Quality(GOAL'B")Driveway(not required) 65 62 ft3 Note:a)The containment discharge rate for the 25-year/24-hour storm is shown to be less than the rate for the 5-year/1-hour because the Containment Area is less than the Project Area b)The calculations assume the runoff from the roof will count to non-directly connected impervious area(non-DCIA)because the the roof drains will connect to Swales or to the French Drain. c) The Water Quality(GOAL"E )Driveway is not required to be met. It demonstrates the overall effectiveness of Driveway Runoff Collection-"Rain Gardens"even with only one-half foot of depth of actual storage(only 0.5-ft of actual storage because trench drain set at elevation 5.0). Prepared by l t TETRATECH P:1200-08515-08003-NAPLES STORM WATER MANUAL1SupportDocs\Calcs\Naples-Stormwater Manual-Lot 1 Alt 1.XLS 5 of 5 Wednrdey,August 20.200110:411:40 AM DRAWING:P1200-01151608003-NAPLES STORM WATER MANUALIGUSNetFlee1Se1ngM Lot I DWG LAYOUT:LOT I ALT t USER NAM PAULA OAVALO5 1 • tnTZl U N 1 porno (prl R.WmA O �t = Ic 2 n vtyQrm vyzfl Z 14- a az ��OOm 0 O F' O �mm0 T= 2 1. 5 {to 113-0 nz wpD r.. e bA;ln 7o rnTDm ? a' a' .:D Om a a�-C wpyn mm � y --{i bb O T co z 5 s cy m cn-AD z • 1n a Pr Tor N^+UP9 • xx u x GI ��8 U+ �(t^ y�v_I0 vi K i CIO - y D° lam"l i i i{:'��i1�1 y O q fT -13 zRI •�i,ll 1t4 O m m z _� �1,1,1�,.�.7.1d11,t• l K 1 hV1,101 S'SLI IDEWA tt} I 0< Du1 j:1�11 t711(11151{ m O R1 141 v.�l� i 151:1511.4, \m z • 171 �' hl'Idjt, q �, y Q "1 \,','I WIPP l 151JL1'11N11'Yt' 0 1 - z •111., 1;1;1;11011' k m Z m, 1'1' 411 I;It X ti `� m m z K , 1tq 1'1111 111 14:1; <mq o z 7 1;1,11(hit{,11t111'1, m A A z 8 littifI, 15,.¢1.1,11 <C ,c 1 m or a 4` 111;111,1. 1141.14%1;1;11gt11111`.1$t y 0 m m D u v n .11¢411;111 ey'11'11.. �.c•o_ - v 7° >< < C7 0 `I{ 1;1117171111 111:1!.1...... Ai, IA to 1 o in ✓ 3 W A O 1. i.1 11.S't?1 111111117111; o b D 1'1 1 t' t,1. ll o a I 0 m a 1 i7 11ttilt.1,1 ,I 11.11 1 A 1;��11t1'1'1114.1 11'H15I' -1 ( I It 11,1'.. ,1'"i • a J. _1 , . 11� 1 ..._._-_-_ e 01�' „1• ' m 1— Z m �'1, 1,1 10'1:1'1 y ;1;1;1715 11 �1 'm O 6, C 111 m RI 1�1�1`.111__,l` -._�__ 7 ` �T GzCA D { v n -1 r Q ' 601.. �i. 7.5' - r s Oo gE Z �E O � ' �z �9 1�;1 '"t V - II on °mTn W P Ri N '"-' in O D - J �'' { 0�1 j m 0 17 .�.'��'�JJ11 v1 D 1-z 1'1 z iI ' U N °X m D n z 0 m �1 No �r o �.m z a -1 D� I Nz0 o N Cm >. * Ill = _z 0 0 = o i1`i z Pu,r n 1) m cn // `j 41 i �1 M`" Ilt r� ' 9ug 1 In r. 5. o i; leoA o zom G I x Q y y�.s sea: 'os�si'w 75.00 m • s u o U, 1 m Ss" m z >~ 4 n m r p -1 $a g n � = z m E 3 �� o m O z13 Z rn O v -I cn 0 -io i -Ti ,...,r- 0 Tl O E-, m0.) I- � T I • u,t d � D c >m m r to 1' a a'c 3 --4-4 v L' a it r Dm R=g aott C} zcn j-m 0R-k . D °c zn' F- c P — .D H1 - g� o A , z g� p . • z IN Z Cl) 0 s@@ 0 A cn VJ I S7. II II II II 11 A u q x II II II r F p . 1, - ay _t N P. 1..., N . .. . . •�= O D % 1•1?, o of v ;p;, w I 11'...' j u WOAelday.Aupuel 20.20089'.48:00 AM DRAWING:P:1100-0H51B-08003-NAPLES STORM WATER MANUALICA5kS.eIFbolSomple Lot 1.DWG LAYOUT:LOT1N.T1-DET USER NAME:PAULADAYALOS r • - 41Ilk "t •'43 Ez „ P; :.; o '^ Tmr y Sm _ ra mii71 m ;r Z f1 j3 w o l Q! m Z N 'r: 5s`i '.;5``.y.'y`�` •":.� yA Q 2 r m mamas= R:% /i✓Xi: ,{ .F;�+;; ‘••••-- — r m r�r t* %n n p , 7i iN.-\,.f%,y?, nr 4 .4 1,,,,,! ,O. 001 --I ' ate,}1n� .% ri D 'Y� _t�1. A 2. jy { l rNA ,� W m$/.:Aki z I®0Fi®i II Qf TT O0 Z� iffi � m P 1- z m L� OY �€'� a� Oy $.. • m0 00 J a i r7) .6 cG1) mt-' 1 m nl -a b, my 1 m �1 c Pm -&- zo '8 mm mo - m -t O O Z CO rt i T i 9kiiZ L) / Z m Z G) - mm - 1 I -L A O� m >0 o Ti r, (,, ,,„ , ..7)% nr. 0 r3 C` ti ` IV Q O \ gt..�i< N �N, X `it lith , + Z \,,,,K.< . i in 4 m -I 1i— m t'l..j to n kVX. �` : 'e� r m.l 11 v P.,. 6 0 M > 00r I; pmp gA co x, ca 8 E z ,K�.k�' "n '^O en x'F m CI *e q (I) Tg a, 073 0 y00 "' m-1main ! Ir"r I— Y4: iiii m D O Z y—I[ t , x m m rn ig...:xt.,.. m F: ,,,MZ r--4 0 0 0 II n ■ II Z rf., . -1 r +`m ›,1 3 mmz Ai�yyZ - >1. Z to - __I m m ��m ^ f�j•� %` �1 C s_A m m30r_ 0 ^-C),1E.,t . �1 rr-- D z 0o8o ykti7i F mz z r *.m'S`•i.sr 4 o P v z �z>< F::1w: a7 x r / •A..>;.... r ,-.1 A31 1 Q. r W In \ I--- I, m \�I _ / i t co I r �► I } t I '�� nn I I + III x tir lliihllll ill t lli ,i 4 :`'l-i + frp r 9r .,f 4`I ,i 1 I t t :�r1�i<' ? 1��e, al�Awr�r !1 I { �: re I'(c: 4%.7 t �kt��ktL8 �fEa I{{� -';.t �. '., - .,.�,tl:. _f. .:� ;tr �_� ;r '` �'7w hf �4 • 1•I fr.y, 1 ,• df It'. TREATMENT VOLUME REQUIREMENT Sample Lot 1 -Alternative 2 Description: Push the sidelot setbacks to 10'but keep the same total square footage, use containment berm instead of wall,pool unscreened, and textured impervious driveway Ordinance 07-11807-Sec. 16-115 Stormwater Construction Standards CONVEYANCE! STORAGE/QUALITY LAND USE QUANTITY (GOAL''B") • (GOAL"A") Single Family (A) (B) Multi-Family (A) (B) Non-Residential/Mixed (A) (B) Use TECHNICAL CRITERIA NOTES: (A) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District Criteria, a storm event of a one-hour duration and 5 year return frequency shall be used in computing the minimum off-site discharge rates from private properties to the City's stormwater system. The stormwater conveyance system shall pass the design flow while ensuring that the backwater head does not exceed the proposed berms,walls or other containment systems in a twenty five year-24 hour storm event. The side lot swales and other emergency conveyance facilities may be designed to pass the water forward to the Public Right of Way, (B) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District Criteria, water quality standards shall be determined based upon selecting the most appropriate pollutant removal presumption to the corresponding BMP technique. The BMP guidelines used must meet a presumed pollutant removal of 85% Total Suspended Solids (TSS), Total Nitrogen (TN), and Total Phosphorus (TP). BMPs that do not effectively remove TN and TP such as "dry detention" will be discouraged. Innovative approaches and LID techniques that reduce percent impervious are encouraged. Although reductions in storage volume may be given to BM Ps that use "retention" and exfiltration, under no circumstances will the design storage volume be allowed to be less than half inch (0.5") of retention storage volume nor less than 1.25 inch of dry detention storage volume (based on total site area). The following special conditions shall apply in meeting the above standards: a. On single family lots no more than one-half inch of detention or retention shall be stored underground in vaults,exfiltration pipes,or french drains; b. Rainfall runoff from roof drains can be disregarded from the water quality calculations (GOAL "B") but not from the conveyance calculations (GOAL "A") since roof water is not a major source of pollutant concern but it is a major concern for release into the public system for flooding considerations. Directly connected impervious area(DCIA)is discouraged for purposes of GOAL"A". c. Retention systems shall be designed and located no less than 18 Inches above • the wet season water table; exfiltration and pervious pavement shall be designed to be a minimum of 24 inches above the wet season water table; d. Where special filtering materials are utilized, where swimming pools and patio areas are designed for storage or where special retention provisions are provided consistent with SFWMD criteria or consistent with Chapter 62 of the Florida Administrative Code, the building official may credit such areas in the computation of total on-site storage. Prepared by • TETRA TECH P:1200-08516-08003-NAPLES STORM WATER MANUAL1SupportDocs\Calcs\Naples-Stormwater Manual-Lot 1 Alt 2.XLS 1 of 5 +i 7Ti a• Jive .16•I tiNx ••�� i�f Its til'��yryeHI a it , ll IJ "~`i�' F.1 1 I �}'i I I 1'I{l r, " Tt;d,'. ,I� I a i` a r .r, 4 11. -k1) t I r.P1 i �l '.w �� , F1 1;1. I � � a ^� l ",:a r e �i'aIk�lJit�:. I, 4l N, ,i ,, NO'' Sample Lot I -Alternative 2 Proposed Lot Area Calculations Total Lot Area 11,250 sq-ft 0.26 ac Total Impervious 7,235 sq-ft 64% Imp.Roof Area 3,855 sq-ft 34% Imp.Non-Roof Area 3,380 sq-ft 30% Pervious Area 4,015 sq-ft 36% (necessary for Water Quality Calculations) Containment Area 7,463 sq-ft (necessary for Water Quantity Calculations) (A)CONVEYANCE/QUANTITY(GOAL"A") REQUIRED CONVEYANCE(GOAL"A") 1) Establish Minimum Discharge Rate(per Sec. 16-115(a)(A)) 5-year/1-hour storm event Peak discharge estimates may be calculated from the Rational Method(Q=CiA): Q= runnoff(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) • A=watershed area(ac) Note:a)Various publications have recommended values for C for both the undisturbed lot and the developed lot(i.e.ASCE Manual of Practice No. 37, 1970) [most undeveloped lots in Naples will range between C=0.2 and C =0.4] b)The runoff coefficient, C, for the developed,or post,condition will require a composite runoff coefficient calculation.This calculation is: Ccomposite=(Cper lous*%Pervious)+(C;,,,pp@,,,;0, `%Impervious) c)The rainfall intensity can be determined from Rainfall Intensity-Duration-Frequency Curves published for the State of Florida(Collier County is located in Zone 8)and are a factor of the Time-of-Concentration(minimum value of 10-minutes). [most lots in Naples will use i5yr=6.9(in/hr)which assumes a Tc of 10 minutes] For Design Example SLI-ALT2: CPOST= 0.69 (0.3*36%)+(0.9*64%) 15n= 6.9 in/hr A= 0.26 ac QPOST= 1.22 cfs Minimum discharge rate required from the developed lot: 12-cfs Need: 1 Pipe to convey 1.2-cfs • The City requires the exit velocity for residential properties to be greater than 1-fps but below 2-fps(unless otherwise approved by_the City Engineer).Assuming the culvert used will be sized for the exit velocity. • 8-inch is the minimum outfall pipe size regardless of velocity. 1-12-in HDPE will convey 1.2-cfs at a Velocity,V,of 1.4 fps 4- 1 -10-in HDPE will convey 1.2-cfs at a Velocity, V,of 2.0 fps (too fast) Select 12-in (single 12-in HOPE pipe to be used for discharge from lot to minimize erosion of roadside swale) Prepared by [Irk) TETRATECH P:11200--085516-08003-NAPLES STORM WATER MANUAL\SupportDocs\Catcs1Naples-Stormwater Manual-Lot 1 Alt 2.XLS 2 of 5 lf�t:..• ��-l{ P' I t 1 d e4 t f�f �� rt 10 1, 0 (xf`t� 4�± 1 [l�9f1 i{i Y 1 11 �1,11 • L11f.,.:per:.. Sample Lot I -Alternative 2 REQUIRED QUANTITY(GOAL"A") 2) Establish the conveyance system will sufficiently pass the Runoff Discharge Rate for 25-year/24-hour Storm without overtopping(per Sec. 16-115(a)(A)J Discharge rate estimates of the"Containment Area"may be approximated from the Rational Method (Q=CiA): QContainment= peak runoff from Containment Area(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) ^Containment= Containment Area(ac) The"Containment Area"(Acontainment)is the area that will contribute to the runoff through the side lot swales and will need to overtop prior to discharge from the property For Design Example SL1-ALT2: Containment Area 7,463 sq-ft (necessary for Water Quantity Calculations) Pervious Portion 2,270 sq-ft 30% Impervious Portion 5,193 sq-ft 70% CContainment= 0.72 (0.3*30%)+(0.9*70%) A i25yr= 8.4 in/hr(from FDOT Zone 8 IDF Curve) AConlainmenl= 0.17 ac Qcontainment= 1.03 cfs 4 The approximate peak runoff rate from the containment area will be Qcontainment•The"Maximum Containment Elevation"(MCE)of the property can be approximated from the Weir Equation (Q=CWLH°) QContainment= peak runoff from Containment Area(cfs) CW=weir coefficient(dimensionless) L= length of weir crest(ft) H= height of water over weir crest(ft) O+Containment= 1.03 cfs C = 2.6 (dimensionless)sodded broad crested weir L= 3.00 ft H= 0.05 Ift I 0.6 pinches The Maximum Containment Elevation of the property can be approximated by adding the Height of water over the Weir Crest(H)to the overflow elevation shown on plan view.The City requires 1'of freeboard from the MCE.Thus,from the sketch of SL1-ALT1 with weir elevation 7.5 the MCE=7.5+0.05=MCE=7.55 or 7.6 Prepared by [7.* TETRATECH P:1200085516-08003-NAPLES STORM WATER MANUAL1SupportDocs\Cafes\Napier-Stormwater Manual-Lot 1 Alt 2.XLS 3 of 5 Okint li ] • 1,N •2-1 4^14: ifr`I.ti�h�IHllytl +I��(Q i' 1,f ` �f (4nW) 1 ".11N, t �l y ;.s• • f ui n t r' Sample Lot 1 -Alternative 2 (B)STORAGE/QUALITY(GOAL"El REQUIRED QUALITY(GOAL"B") 1)For Retention Storage(per Sec. 16-115(a)(B)]: (Total Lot Area-Imp. Roof Area)*1/2 inch of runoff For Design Example SLI-ALT2: 1) 308 ft3 (utilizing retention storage) Note:a)The Water Quality(GOAL"B")volume calculations exclude the roof covered impervious area per Sec. 16-115(a)(B)(b) b)The runoff from the driveway cannot be directed back towards the retention swale therefore a trench drain has been installed to discharge into a rain garden to collect and treat the pollutants for this problematic graded impervious area.The use of the trench drain and raingarden are encouraged BMP's.[approximately 1550-sf of the driveway can be intercepted by the trench drain] (Total Driveway Area draining to Rain Garden)*1/2 inch of runoff b) 65 ft3 4 (utilizing retention storage) REQUIRED STORAGE(GOAL"B") 1)Maximum Underground Retention Storage[per Sec. 16-115(a)(B)(a)]: VMAx= Maximum Volume allowed to store underground(i.e.exfiltration) VMnx= Total Lot Area*1/2 inch of runoff For Design Example SLI-ALT2: 1) 469 ft3 Prepared by rit--1 TETRA TECH P:\200-08516-08003-NAPLES STORM WATER MANUAL\SupportDocs\Calcs\Naples-Stormwater Manual-Lot 1 Alt 2.XLS 4 of 5 .r r',Ij`'�' ', ,! , , .1 .1Iiir� ,i. „.„,,1� l tb. ° ,,,a ; ,i,1 i� ;6'<<j� r,t � r a � a�,��'" rti,1 C 'a7 'F l' the , s V: lif :� r 1141' 4..'3' '' � s ,,h " .Hill 41 �' '' - 111 .d',.� L- "lr� 1giiil i llll�I s' i ' s4 r 1I awo tlp'1 s_4 .d + H r• . Sample Lot 1 -Alternative 2 PROVIDED STORAGE ON LOT 1)Storage through Retention Swale Swale Data Side Slopes SS 3 Swale Depth d 0.5 ft (overflow set at 7.5') Width of Flat Bottom w 1.5 ft 1 Swale Length L 245 ft Swale X-Section Area Asw8,0 1.50 ft2 Aswa,e=2'(0.5'd'(SS`d))+(w'd) Volume in Swale Vswa;e 368 ft3 Vswa,e=Aswale`L 2)Storage through Rain Garden Retention Stage Area Average Incremental Cumulative Area Volume Volume (ft) (Sq.Ft) (Acres) (Ac-ft) (Ac-ft) 4.5 96 5.0 150 123.17 61.58 62 6.0 259 204.67 204.67 266 Total Total Required Provided Water Quantity(GOAL"A)5-year/1-hour 1.22 1.40 cfs Water Quantity(GOAL"A')25-year/24-hour Containment 1.03 1.03 Water Quality(GOAL "B") 308 368 ft3 Underground Retention Storage(Max Allowable) 469 N/A ft3 Water Quality(GOAL "B)Driveway(not required)_ 65 62 ft3 Note:a)The containment discharge rate for the 25-year/24-hour storm is shown to be less than the rate for the 5-year/1-hour because the Containment Area is less than the Project Area b)The calculations assume the runoff from the roof will count to non-directly connected impervious area(non-DCIA)because the the roof drains will connect to Swales or to the French Drain. c) The Water Quality(GOAL 'B')Driveway is not required to be met. It demonstrates the overall effectiveness of Driveway Runoff Collection-"Rain Gardens"even with only one-half foot of depth of actual storage(only 0.5-ft of actual storage because trench drain set at elevation 5.0). I Prepared by lib TETRA TECH P:\200-08516-08003-NAPLES STORM WATER MANUAL\SupportDocs\Calcs\Naples-Stormwater Manual-Lot 1 Alt 2.XLS 5 of 5 I — i cV` el at e.eak 1� •n- �A'ye T p O 010 4 p o it s p M O co 1•1 N N I W N YI yy — I ~WW t o N _ g - a �n Si V O tO O C� N y �� - l7•-•- Ni 1� Ih•' N J ■ K II H N II 11 II K 11 II Z 7 Z 01 O c. k a a Q c.aS z F- Z 17 Z N 0 0 - o ' •E9 cYiV ° w � h1 D II V n2A'? H a]0-0 m ~0 # WZ Q E rn9 '-A = Z ..,,,.;2 4 a �CI) J w a2 0 Ti.o - 3 8 tt mm -J—J J U- Z 0 ¢ O ILI Z W 3 0)O IU W w Zip D Z cc JQ W i :S'''':.. Z N ~ 4. rn 8 dpSLM�690ZE 49� "'"--11. �' i 2 O 11 t - ,t:, 0 ?r✓ ` {� y3iid 0 ,1� C i- 1 Gid' „ v+'• Oajai' W g , .ev'r', 1 I 0 ll j% +' CV kyl Wui 0.)i a ❑1- \ --,"A— A oa ( Ln Wa o 0 uj O 44 0\11 y� U zzM ` m a i11 o F ,OL 5 ee c c U �� a❑� d -1 N W a u r 7. �' Ow z Q 7. R O _ {{ J u! U d ,o� `Il , z>® ¢ U 'SZ I� 1 / d Z 1'- 2 N 1 5 0 1/ n!/ 'Ijk I t �f,l�� , W J w W E € b 1 V �14r ` �` , 1 n z a s 3 b 4 m 1 1'J �� 1� t II 1II.y{ilit �.�l' IIIJQ F' B -0 b `�'I V} iy,t'ICtsI! MC . I nl w yW8Q CI 6 I mEi 51\ts I i z LU ZD ZO uj u1I "o'' '1 4 r1 1J '1; 1'c L '1 O O to { ilk. , z Z -.4,,p4r l4 , W z N 1, :j ` py'8 4,, °w Z LLY O O In I T 8 1,. NO, a s O O u o 1,` hhlt'tII.L'a' fi ` U(7 . . 1L_x vrn otss l'._..' '1V.11-11'-i -IIII—— a s Z IL O.0t 6 `I1.... r. -. WN tip WZ m h. UJ fn —,_ 1 1 Ill''+",I ,r rc rc N I F3( m >` '' in W r I..I.f' 14.' to til WU; :4.4111'0.71,...11.1'., ' z �o 13 z. Y r c' U c 8 u❑i m v ' m 't3 I-O1_0, N n_I5- ocn> wQ¢ d W,F z v P` 8 g o NGI,LIn cn0 ul ct3a m _ WW WOOq 111 } JLL(7 >>w p j J a O~m 2 J v 01 i gi �. F-0 ^ 8 N In 0 � (LI W 1Y O IZ U M - Z a a. t 3 (7 W 2" N t1 U W ~ a LL Q C C 0 O z oddoW o�O�iw a N• O.CCCLLmK zavla SOlVAVO YMVd 3WVN N35n ?11V 1101,1n0AVl OMI 1019d..S5.9151.4SWV01lWfNV111 V3LVM WM014531dVN•CD000-9tS40.00L4d:ON1MvN0 WV Et-01,41800Z'az 1*' Y'0P UDM 1 c Q W s N J 2,M ter-~-s �� w ,.., _ is \ iw o J O.030 J 2 az„, fA 1 w0 zJ I\ N / P0w L• . CO <1-z0 w A m ><ZO w o 0 � r • _. : , w a wre b 3..vi4sstpt!;rp ,- 0:0 z N J w J MOW:t. J O .., a:.• rs Oo°WEU Q •s,¢;y;j W tu `I?ig P 0< SZ-IW -i ':,-0.4y01 a L.0211a W '6 0 W > Q � Z um . . m H J < Z cc 4D W o 2.�og ¢ IL�- a •yh W u+wx , ' I--< �CO LI r�� I S -J u..mZw cZceE- r� a1 2u- F w - rr LU y�ix a Z 6 ,_ p U W s a.lt w LU a• w W :r f i EiJo 0re z n i� i� it •4. 1 411 ,Ykt 0i Z it 8 3 F. 6 1`�,ya V /:' nf . � lY � S � 6 ! �? , a �2 i l ,,pi Avb II ,, +<v � \ J ; ilirik*-k,. .,,,k_ —_, ,..,, ,. :!:,,,, ,.;.„-:,,,,, ci to 1111111 MI NM IIII MI MI FA isinimuma !< %}te��t ;,. -0'4 11;:.'‘gz:: :::'):Pri;.V.:.: 'i 1 t •b •0 mz coy ;>J •:z2�ntO ?=r'fi awl-7i'a . • 0 a`../ s. _ I SCW M:11nm;:OWN tenon 13041N 1101,1f10AYl 0M0'IPl 9awSINAA1P4510VJ11111M/MI tl31VM PW1016 S31d1M•MINIS 410-00Ltid:ONIMY1:10 1W CMG 200i'O1 many'AzP 4•M �.1 I. �� : _ t'l•• :;.4,:•i• ',Al k�j'i p it i 1:. !,it,, 46` ,> '�"� ur�k,. Y"t.t 1v.° �� �, r 3 Ih hm��is�r' jJ�i�l�Ail ��- 4. .. 1 n r , pl r ..'3•-..,•1. Y ,8•R d 4 i1"R g• TREATMENT VOLUME REQUIREMENT Sample Lot I -Alternative 3 Description: Use the minimum 7.5'sidelot setbacks, use privacy wall with waterproofing,pool with screen enclosure, "paver'driveway with an exfiltration gallery instead of side yard exfiltration or retention swale Ordinance 07-11807-Sec. 16-115 Storm water Construction Standards CONVEYANCE/ STORAGE/QUALITY LAND USE QUANTITY (GOAL (GOAL"A") Single Family (A) (B) Multi-Family (A) (B) Non-Residential/Mixed Use (A) (B) TECHNICAL CRITERIA NOTES' (A) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District Criteria, a storm event of a one-hour duration and 5 year return frequency shall be used in computing the minimum off-site discharge rates from private properties to the City's stormwater system. The stormwater conveyance system shall pass the design flow while ensuring that the backwater head does not exceed the proposed berms,walls or other containment systems in a twenty five year-24 hour storm event. The side lot swales and other emergency conveyance facilities may be designed to pass the water forward to the Public Right of Way. (B) Unless otherwise specified by previous South Florida Water Management District (SFWMD)permits or District Criteria, water quality standards shall be determined based upon selecting the most appropriate pollutant removal presumption to the corresponding BMP technique. The BMP guidelines used must meet a presumed pollutant removal of 85% Total Suspended Solids (TSS), Total Nitrogen (TN), and Total Phosphorus (TP). BMPs that do not effectively remove TN and TP such as "dry detention" will be discouraged. Innovative approaches and LID techniques that reduce percent impervious are encouraged.Although reductions in storage volume may be given to BMPs that use "retention" and exfiltration, under no circumstances will the design storage volume be allowed to be less than half inch (0,5") of retention storage volume nor less than 1.25 inch of dry detention storage volume (based on total site area). The following special conditions shall apply in meeting the above standards: a. On single family lots no more than one-half inch of detention or retention shall be stored underground in vaults,exfiltration pipes,or french drains; b. Rainfall runoff from roof drains can be disregarded from the water quality calculations (GOAL "B") but not from the conveyance calculations (GOAL "A") since roof water is not a major source of pollutant concern but it is a major concern for release into the public system for flooding considerations. Directly connected impervious area(DCIA)is discouraged for purposes of GOAL"A". c. Retention systems shall be designed and located no less than 18 inches above the wet season water table;exfiltration and pervious pavement shall be designed to be a minimum of 24 inches above the wet season water table; d. Where special filtering materials are utilized, where swimming pools and patio areas are designed for storage or where special retention provisions are provided consistent with SFWMD criteria or consistent with Chapter 62 of the Florida Administrative Code, the building official may credit such areas in the computation of total on-site storage. Prepared by • "lb TETRA TECH P:\200-08518-08003-NAPLES STORM WATER MANUAL\SupportOocs\CalcslNaples-Stormwater Manual-Lot 1 Alt 3.XLS 1 of 5 li �.. , ,r,...,,-,, i h'1S .i o f{ It ,, ,. :!ti.,�� i'Nznt,.tt jjS 1 jj i, �tt, *• e L { 11 3pgijtrg I tl,,t.I}, 1 gi ,a b yy t ,r,4 x 3 pyrt i�.s �- ,d ".r • "Si€: s Zs � c NIt., • 1 n� 1 13 �#i r' AI Sample Lot 1 -Alternative 3 Proposed Lot Area Calculations Total Lot Area 11,250 sq-ft 0.26 ac Total Impervious 7,235 sq-ft 64% Imp.Roof Area 3,855 sq-ft 34% Imp.Non-Roof Area 3,380 sq-ft 30% Pervious Area 4,015 sq-ft 36% (necessary for Water Quality Calculations) Containment Area 4,016 sq-ft (necessary for Water Quantity Calculations) (A)CONVEYANCE/QUANTITY(GOAL"A") REQUIRED CONVEYANCE(GOAL"A") 1) Establish Minimum Discharge Rate(per Sec. 16-115(a)(A)] 5-year/1-hour storm event Peak discharge estimates may be calculated from the Rational Method(Q=CiA): Q= runnaff(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) A=watershed area(ac) Note:a)Various publications have recommended values for C for both the undisturbed lot and the developed lot(i.e.ASCE Manual of Practice No.37, 1970) [most undeveloped lots in Naples will range between C=0.2 and C=0.4] b)The runoff coefficient, C, for the developed,or post,condition will require a composite runoff coefficient calculation,This calculation is: Cwmpos;te=(Cpeni10 *%Pervious)+(CimpemW,*%Impervious) c)The rainfall intensity can be determined from Rainfall Intensity-Duration-Frequency Curves published for the State of Florida(Collier County is located in Zone 8)and are a factor of the Time-of-Concentration(minimum value of 10-minutes). [most lots in Naples will use isyr=6.9(in/hr)which assumes a To of 10 minutes] For Design Example SLI-ALTS: CPosT= 0.69 (0.3*36%)+(0.9'64%) i5yr= 6.9 in/hr A= 0.26 ac QaosT= 1.22 cfs Minimum discharge rate required from the developed lot: 1.2-cfs Need: 1 Pipe to convey 1.2-cfs • The City requires the exit velocity for residential properties to be greater than 1-fps but below 2-fps(unless otherwise approved by the City Engineer).Assuming the culvert used will be sized for the exit velocity. • 8-inch is the minimum outfall pipe size regardless of velocity. 1 -12-in HDPE will convey 1.2-cfs at a Velocity,V,of 1.4 fps 4 1 -10-in HDPE will convey 1.2-cfs at a Velocity,V,of 2.0 fps (too fast) Select 12-in (single 12-in HOPE pipe to be used for discharge from lot to minimize erosion of roadside swale Prepared by • r "'t TETRA TECH P:1200-08518-08003-NAPLES STORM WATER MANUAL\Supportfocs\Calcs\Naples-Stormwater Manual-Lot 1 Alt 3.XLS 2 of 5 s i 4fi elm 1 'Ili .r e;‘ ', .', p I]Iitiii 4 �, 4 ,'.i xr, ss ' t �" 1 �N,,. a.a" ,;tr � 1a 11' I {{ 0,i.giI 1 It Thy, ,. it t1,'-‘,,,;,f-.' R , ;:.s t{ w t s, Orsi l' i. ', .l i,� s I t zssl k ' . r 16' ! � ^s ii P Sam t le Lot 1 -Alternative 3 REQUIRED QUANTITY(GOAL"A") 2) Establish the conveyance system will sufficiently pass the Runoff Discharge Rate for 25-year/24-hour Storm without overtopping[per Sec. 16-115(a)(A)] Discharge rate estimates of the"Containment Area"may be approximated from the Rational Method (Q=CiA): ()Containment= peak runoff from Containment Area(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) AContainment= Containment Area(ac) The"Containment Area"(Aaonteinment)is the area that will contribute to the runoff through the side lot swales and will need to overtop prior to discharge from the property For Design Example SL1-ALT3: Containment Area 7,190 sq-ft (necessary for Water Quantity Calculations) Pervious Portion 1,765 sq-ft 25% impervious Portion 5,425 sq-ft 75% Ccontainment= 0.75 (0.3"25%)+(0.9"75%) i25yr= 8.4 in/hr(from FDOT Zone 8 IDF Curve) AContainment= 0.17 ac ()Containment= 1.04 cfs ~- The approximate peak runoff rate from the containment area will be Qcontainment-The"Maximum Containment Elevation"(MCE)of the property can be approximated from the Weir Equation (Q=C,wLH2J3) QContainment= peak runoff from Containment Area(cfs) CW= weir coefficient(dimensionless) L= length of weir crest(ft) H= height of water over weir crest(ft) QCmtalnment= 1.04 cfs CW= 2.8 (dimensionless)sodded broad crested weir L= 3.00 ft H=I 0.05 Ift 0.6 'inches The Maximum Containment Elevation of the property can be approximated by adding the Height of water over the Weir Crest(H)to the overflow elevation shown on plan view.The City requires 1'of freeboard from the MCE.Thus,from the sketch of SL1-ALT1 with weir elevation 7.5 the MCE=7.5+0.05=MCE=7.55 or 7.6 Prepared by TETRATECH P:1200-08516-08003-NAPLES STORM WATER MANUAL\SupportDocs\Calca\Naplea-Stormwater Manual-Lot 1 Alt 3.XLS 3 of 5 ,'r 'fib ; .1' g P!p e t . t�I` r • i 1 'i 4.114,1v:, ii'I4''Y nuv.- 1 (( �• ri)19I 11, ' fltf . : It. f 1 '3 p Sample Lot 1 -Alternative 3 (B)STORAGE/QUALITY(GOAL"B") REQUIRED QUALITY(GOAL"5") 1)For Retention Storage[per Sec. 16-115(a)(B)]: (Total Lot Area-Imp. Roof Area)*1/2 inch of runoff • i For Design Example SL1 ALTS: 1) 308 ft3 41- __ (utilizing retention storage) Note:a)The Water Quality(GOAL"B")volume calculations exclude the roof covered impervious area per Sec. 16-115(a)(B)(b) b)The runoff from the driveway cannot be directed back towards the exfiltration gallery therefore a trench drain has been installed to discharge into a rain garden to collect and treat the pollutants for this problematic graded impervious area.The use of the trench drain and raingarden are encouraged BMP's.(approximately 1550-sf of the driveway can be intercepted by the trench drain] (Total Driveway Area draining to Rain Garden)* 1/2 inch of runoff b) 65 ft3 41 — (utilizing retention storage) REQUIRED STORAGE(GOAL"B") 1)Maximum Underground Retention Storage[per Sec. 16-115(a)(B)(a)]: VmAx= Maximum Volume allowed to store underground(i.e.exfiltration) VmAx=Total Lot Area*1/2 inch of runoff For Design Example SL1-ALT3: 1) 489 ft3 Prepared by TETRATECH P:1200-08516-08003-NAPLES STORM WATER MANOAL1SupportDocs\CalcstNaples-Stormwater Manual-Lot 1 Alt 3.XLS 4 of 5 ,, l -r ^`'I l,i, �.0'"' ,,� , i ' ai r;,.. €,1•:,:.10,1'i r �41 ilf I� rr 4> ,,d '{rf G r ' , l- '16 t Ir E € �It, f h� s'= .'. +11141 ailid �, 4. r i1 '' ^II tr .+4.31ir�1y� i'' 1a rox . 4 ', l'i' I� , +l aW € s Af c; • ' ... : 545 ,€ 1€ � .1€I !! 11 fl !.r t , � Sample Lot 1 -Alternative 3 PROVIDED STORAGE ON LOT l 1)Storage through Underground Retention(Exfiltration Gallery) Trench Data Exfiltration Depth D 1 ft Surface Area Ae,il 640 ft2 Fillable Porosity f 0.50 Volume of Void Space V, I 320 ft3 V,_(AB„,I)*D 1 Exfiltration Gallery Volume Vtrent, 320 ft3 Vvena,=Vpipe+V, 2)Storage through Rain Garden Retention Stage Area Average Incremental Cumulative Area Volume Volume (ft) (Sq.Ft) (Acres) (Ac-ft) (Ac-ft) 4.5 96 5.0 150 123.17 61,58 62 6.0 € 259 204.67 204.67 266 3)Storage within Conveyance Swale-the volume is too miniscule to gain credit in this example Total Total Required' Provided, Water Quantity(GOAL "A")5-year/1-hour 1.22 1.40 cfs Water Quantity(GOAL "A)25-year/24-hour Containment 1.04 1.04 Water Quality(GOAL "B) 308 320 ft3 Underground Retention Storage(Max Allowable) 469 320 ft3 Water Quality(GOAL "B)Driveway(not required) 65 62 ft3 Note: a)The containment discharge rate for the 25-year/24-hour storm is shown to be less than the rate for the 5-year/1-hour because the Containment Area is less than the Project Area. b)The calculations assume the runoff from the roof will count to non-directly connected impervious area(non-DCIA)because the the roof drains will connect to the exfiltration gallery. c) The Water Quality(GOAL "B")Driveway is not required to be met.It demonstrates the overall effectiveness of Driveway Runoff Collection-"Rain Gardens"even with only one-half foot of depth of actual storage(only 0.5-ft of actual storage because trench drain set at elevation 5.0). Prepared by TETRA TECH P:1200-0'8516-06003-NAPLES STORM WATER MANUAL 1SupportDocs\Galcs1Naples-Stormwater Manual-Lot 1 Alt 3.XLS 5 of 5 '8 CO r 1 Q� "\$ J N .(1 N N 4 g N \1 O N ��i t O N ♦ N Z $ ItSN•N�m, 4 4 rw N ° " t NN a 4 ' o \j1 g h i -12 L o c CL I d� i (f) --1 4 ul a t $ Zvc 4. $,o Z;rZ G��ag.--o- O p Q %.1.12. ;r- \ :*X \ 1?0 an� $�� � 8Qr r d 3 U a ®riO� i� u ` tfd xo O W FO N � o a 4 mi 14 1 "Vi r Y o r w OJ wd 12 Y Zj +} �\ QS U �S--'l ; O \ in t., ffir3 in O YY ,.... ,,-4*,. .i._37.4 r �� 0,0 u� All„, . , ,,.,, 0 ,,,, . 4, ,„0 \ > Y•-i I' tu Z 0- i 1 0 b LU < CO ci 0 • CC it I- if ta a - o I— 2 ce q9 c‘l —I 1 0 U_ CO UJ • 0 w ' 8 15 P 1— e. o•I itt n r 1 .. „....... 1 1"'" CI) <r:Zz w o ui < ,• LL1 8 a•-• w ZC- < CM 0 *t rii a Z--i L1J 2 •4q, i=0'.. 2 co ce a. A•:' Q Li ca a al a cn t 0 LU a. <„:, k)' N . . F._ z uuuuna LLI 0 1 LLI u_u-uj wu i I I U-LLI 2 111 I I —1 ;F-7 a_ 1_7. Z In E U)CO LU ?7•.• ••ei Pi ZO • Am.., 0 0 < 0 LU. mil (.0 >" 111 a co o < , I w I L.I v2 U . > z ILI III --- iii ce - .z§:i !g / ,.. z,•?, 11.1 3 i g!: CE 0,,, x il o z 1 a.o._tjj w cr 1- to —I g F-- z ir. 0 II Al z • r/r T. L o ro 0 0..5 o i•-: 0 00 j W 0. I-la LU Ui <0 ,,,,•-••• w-I w. 2.;:.,:e c9: I- .t ° 7-5 5: i-w 0 c! •,,,,,,•;,..,,,,,, .,;,,,',;•::2".F.,,,,., 0 o o g g §‘° .;.-;•5<1..*.,,6s<•,.. Go---- -- --- ---- -....- --,,,,,,,..,•• EL ,.._ ‹u. ....0, N. . • ..1- ___________ -,,, alEIMMINNIIIIIIMINEIIIIIIIIIIMISIMINI 4: _, ta -Y;..7:.3- 5';' ,1$•-•. )::::•2 Q Ei 4,„ '-a."<1•••';'W'Z'..< ", ti t`..- •'•'<;:•`)/2<•A';..:•'. .k: ..:....,.,;t:•";.,1::.•,s:.7,,>"<,,,,',";;: II >- o 7 -.•;,,?,:%5::;,••,•,>kt':•0 to ,'''...:.;?•.'k:::1,"..??.;';>:?; -I I';:A'.c.,P•'::;: ; > , 1_4 • •—•— ,-,:>,:n•j,?::',4':'>:.: T i., (NI'I., — g 4,),.. ..,,,.::: :a,/,:: : 7 7 o i': @ ';:'4 ":4:%•,:'-',4 '7C 'Ci-i ‘,.!,::,,•:.;.•:,0„:..:•,:c.,',.,‘,,..c.:•,, a I— -I c'.; El 1 •;.•.k:;,:-.•:!.',;-:•.>;p::•:,42,':' II. tri (,) > ,:-,e''X?.?;•‘:`-,•"• ,•-; ui a •••••,.> ,-:•:1•A;;•,54:, ',':(••••V,::.:', • ;''';'4'•' ''.:;'-',). '''' a. o :)•.:-:• ;•',.4:"';‘,•'';c:,:;;; 4,.....,..v.,•.•- •X' 0 I/3 -- .. 11111M11111111111111111111Piimimmomme 5 11111.11EMMENIWAIIME11•1114 ----- ; ,.......,::,./.,-;•,.;-,....-.,::'.::,..,.-;•::::,-,, ..r..,•:';,..:..,,:, w ,x.J— --- --,':':"...,....:".;:k; u_ -**•:..0 LLI ...-I •to a:_I • c...! 0 tu —J i ft j2. Z cc D IPJ cc 0 z al Z Lu 0 3 0 Ea AtIL . IL < I so-nmvo rinvd I3rom unn .Ga-t.ovuoi„Lamy)aMO ion wuniuri4.ursNova\1vnum41312VNI owls ea-urer•cominsguaond,9NIMYHO PlY ICI ma goat'a morn/•A.P.,0•AA eN 0 gr 1•f 0 ae at ae 3i 3E O xpo x i alH Ov ANS A g v'� A O_ QEd % ._...:_-_ to vVV N %N`S r, a01 <A N N% % Ill.-_ In ^ ,r _ .•1 R •• 9 n m T II R II I I II II I I I I 11 N 2 o (n RcR a (r U 0 a o 0 0 a N Nng c5�oa Q °' N a d z0.--;;.0 T't a z aY a I-a U lQ o U m= 5 rn W .,gc.8 qr z(nJW J2 g�C ' o c ; t0J ~ 2w !� ` $maim z >ma°in own z � Q o ^ Zr- m 8 8 � 1! O� o O O OQ Il1L U CC Q U I- LI-z ° $ g W W Wve I 'N W VI0 IL Drc14 aAlaaHZJi37I zz w ,vi o 3 • " % Q1-7.0 8 9 S Nm CL al 0 r'' 4, pti Zea "-�� .b-1WAPar$t5 =Z—. + Z Eri la W r I �3 g Z al 13 O O O act J '�• F b0 07 ,11 1 ..asi _C_Lam___. = 0 / qin 0 > �� 1 0. 0Qc Y o < Q K u j Q Q �w 0U. ( /• lbw pp a z Q r W 1 __ , __ 62 li r W aQ W gi W a' O Ili M O O U 2 va N Cl) � a � b r NZ ZQr x F O O O J YCLLj ' F U 1 Ai $ oQp w �N b N OLL^ m N u_ m W cc Z (A co a4°w • � - Jv .M., .•• i LL o� d m la i wp r I w W N jjj gm 1 V/f b ¢ W ' N WI a N I �` o%I CO Z Z Z a f , ��. $S.,,e; i O O O 1 I y,r� ';' /' z z z ` I r.n l`1. If!a �l(n I • O ♦ / 4 F 0 r: I M .a o b o I N. I rn b z In I j "zk 4_ __ �y u, m O W 6 ....... "' .yg •M,61 S5,VZ.bBS'. Y . J v v $ c wa.aw I- F amr oQ Q ° o w W �l'z ! z m w5 ^ p z wzl` d F-z❑ 0 rCOwz�o z a z x zl0.d a r a cc N attu.m O O 0.. U Ci. J i,.. S0IVAVO VVWYd 3YMN N3Sll UT'21O1•117OAV10MQL 1o1g0RNgpl...IS10V011VI1NYM N3IVM MN01S 531dYN•000MYSIS60'00L1:d:0NIMVtla PN LI�LVO10002'021�+N1V'IF. M i rl ca Y F Q lil 2 .t— -5 Di / r e N v Z q I ti , as it c rn• ! J= mCV s LU(9 J Zci N 02w3P. 2 E. Cl) cg / , . ....<..c-2 z w rWOi w W<O J ' KK N 8o�❑J� ¢N Q .w 4� rIL =n w2 a Q g❑ 0 � W< W z� °Y $zw � a U O LL Awa O J F- 4� ❑ .,� Z unxuxn NaQ ZLL� p II[ ' II LLw()� Y N F LL002 W I cc f.- O �.�'x3� �d � UQ E�-az Z ui p c i R O 1: �a = W a spa -Ra � y W m V 4}- --< g a w !Al 89 ; 's ❑ O ud w w U H N Q 31 31�, 1-1-, w i Eck '1' -Ii LLu, 0 W . ; rzii\ :::,,, 1....„. "..,:w.>, i 'co' 03 (1e A z ` N yI FIlY r ..z.:p $._:, Zw 0 x-' Iy� 0 aK Y Za a W o2 w a <0 a Z Qp • zo pZ to Zw � _ y a w r w °' b 0 m '0s 0 g 3 1- w x Y�`5,4.s>;}' `>:., 3 3 z U �re;: ��`m a Z u (azo m z-y .%:'•;•;,,,,,. ..,.;:;•:...;,". ,4,lty'• �,M - � U..� " , gIli Y. ' b fi l .,,, a .11�,1MI0lIIpiwt�O�mii r ��'1om©ies i®. 0zs,LL Cew 1:-A0, 4 ,.,-/O. ,4 .ray' �� &J CO �',�,5. �,,( �..,.., e\y,:,• w �5.,�)�'.%1fj;d J.J. , �A/:4" vtiQ Yi jt b Q IiSn � 11 _ � Lu a 0 w�I�aOIYM0 -311111111111.11111111=111-311111111111.11111111=111111111,11•111•1 0 rc ' 0 CO W ..f 8d gzW 2 0. NI MI0 U t d SOWAVO VVIVd.3MMYl N3SA 130-11TA 0101 WOW'worm Md.u,sm musiOVOINf•xVW7l31VM YTOiS S31dYx•EOOS091SO-00A"dOWMVIO VV tEUOI SOOT OCW61ry'Aepuupkm .41111k..‘' i f{1 r'y Q[ I i, I t � rI '1� �t ( Q( I ',1':1G � � i .I , , N�•iP +G -; TREATMENT VOLUME REQUIREMENT Sample Lot 2 -Alternative 2 Description: Use the minimum 7.5'sidelof setbacks, use privacy wall with waterproofing, 'paver"driveway with an exfiltration gallery instead of side yard exfiltration or retention swale Ordinance 07-11807-Sec. 16-115 Storm water Construction Standards CONVEYANCE! STORAGE!QUALITY LAND USE QUANTITY (GOAL"B'I) (GOAL"A") Single Family (A) (B) Multi-Family (A) (B) Non-Residential/Mixed (A) (B) Use TECHNICAL CRITERIA NOTES: • (A) Unless otherwise specified by previous South Florida Water Management District (SFWMD) permits or District Criteria, a storm event of a one-hour duration and 5 year return frequency shall be used in computing the minimum off-site discharge rates from private properties to the City's stormwater system. The stormwater conveyance system shall pass the design flow while ensuring that the backwater head does not exceed the proposed berms,walls or other containment systems in a twenty five year-24 hour storm event The side lot swales and other emergency conveyance facilities may be designed to pass the water forward to the Public Right of Way. (B) Unless otherwise specified by previous South Florida Water Management District (SFWMD)permits or District Criteria,water quality standards shall be determined based upon selecting the most appropriate pollutant removal presumption to the corresponding BMP technique. The BMP guidelines used must meet a presumed pollutant removal of 85% Total Suspended Solids (TSS), Total Nitrogen (TN), and Total Phosphorus (TP). BMPs that do not effectively remove TN and TP such as "dry detention" will be discouraged. Innovative approaches and LID techniques that reduce percent impervious are encouraged.Although reductions in storage volume may be given to BMPs that use "retention" and exfiltration, under no circumstances will the design storage volume be allowed to be less than half inch (0.5") of retention storage volume nor less than 1.25 inch of dry detention storage volume (based on total site area). The following special conditions shall apply in meeting the above standards: a. On single family lots no more than one-half inch of detention or retention shall be stored underground in vaults,exfiltration pipes,or french drains; b. Rainfall runoff from roof drains can be disregarded from the water quality calculations (GOAL "B") but not from the conveyance calculations (GOAL "A") since roof water is not a major source of pollutant concern but it is a major concern for release into the public system for flooding considerations. Directly connected impervious area(DCIA)is discouraged for purposes of GOAL"A". , c. Retention systems shall be designed and located no less than 18 inches above 1 the wet season water table;exfiltration and pervious pavement shall be designed to be a minimum of 24 inches above the wet season water table; d. Where special filtering materials are utilized, where swimming pools and patio areas are designed for storage or where special retention provisions are provided consistent with SFWMD criteria or consistent with Chapter 62 of the Florida Administrative Code, the building official may credit such areas in the computation of total on-site storage. Prepared by El TETRA TECH P:1200-08516-08003-NAPLES STORM WATER MANUAL1SupportDocs\Calcs\Naples-Stormwater Manual-Lot 2 Alt 2.XLS 1 of 5 !•' a t l T,'h 41 r9L� ` r 11`'4� 4 �1 11}iiI 1t}itI • 11110*0 I tj• d w. •S✓ 'an{ Sample Lot 2-Alternative 2 Proposed Lot Area Calculations Total Lot Area 14,476 sq-ft 0.33 ac Total Impervious 8,754 sq-ft 60% Imp.Roof Area 5,722 sq-ft 40% Imp.Non-Roof Area 5,540 sq-ft 38% Pervious Area 3,214 sq-ft 22% (necessary for Water Quality Calculations) Containment Area 11,132 sq-ft (necessary for Water Quantity Calculations) (A)CONVEYANCE/QUANTITY(GOAL"A") REQUIRED CONVEYANCE(GOAL"A") 1) Establish Minimum Discharge Rate[per Sec. 16-115(a)(A)] 5-year/1-hour storm event Peak discharge estimates may be calculated from the Rational Method(Q=CiA): Q= runnoff(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) A=watershed area(ac) Note: a)Various publications have recommended values for C for both the undisturbed lot and the developed lot(i.e.ASCE Manual of Practice No.37, 1970) [most undeveloped lots in Naples will range between C=0,2 and C=0.4] b)The runoff coefficient,C, for the developed,or post,condition will require a composite runoff coefficient calculation.This calculation is: Cmmposite=(Carvious*%Pervious)+(`+impervious*%impervious) c)The rainfall intensity can be determined from Rainfall Intensity-Duration-Frequency Curves published for the State of Florida(Collier County is located in Zone 8)and are a factor of the Time-of-Concentration(minimum value of 10-minutes). [most lots in Naples will use isyr.=6.9(in/hr)which assumes a Tc of 10 minutes] For Design Example SL2-ALT2: CPosT= 0.61 (0.3*36%)+(0.9*64%) t5yr= 6.9 in/hr A= 0.33 ac °POST= 1.40 cfs Minimum discharge rate required from the developed lot: 1.2-cfs Need: 1 Pipe to convey 1.4-cfs • The City requires the exit velocity for residential properties to be greater than 1-fps but below 2-fps(unless otherwise approved by the City Engineer).Assuming the culvert used will be sized for the exit velocity, • 8-inch is the minimum outfall pipe size regardless of velocity. 1 -12-in HDPE will convey 1.4-cfs at a Velocity,V,of 1.8 fps ♦------ 1 -10-in HOPE will convey 1.4-cfs at a Velocity,V,of 2.6 fps (too fast) Select 12-in (single 12-in HOPE pipe to be used for discharge from lot to minimize erosion of roadside swale) Prepared by fel TETRA TECH PPP:120�00-08855516-08003-NAPLES STORM WATER MANUAUSupportDocs\Calcs`,Naples-Stormwater Manual-Lot 2 Alt 2.XLS 2 of 5 • /..,. .."..--='-'••• • • �. 1 . p,itt + 7t I 4, 11$ i// ,,,F i f " ,,‘„;4 i � tr� I3tdu � , if i Ill t 'rel Ia 1r l'• i{� (' a ( ft � y '•. A' � i 'L, 4 Z� r • 1 i t..-1,'Fr � tCr ;nta, I . ,I ah �)' 1 .; „..' . I' .K ,iilt ! ' i 7iI: JN-' '' 1 .:,14 1.1trJ? Sample Lot 2-Alternative 2 REQUIRED QUANTITY(GOAL"A") 2) Establish the conveyance system will sufficiently pass the Runoff Discharge Rate for 25-year/24-hour Storm without overtopping[per Sec. 16-115(a)(A)] Discharge rate estimates of the"Containment Area"may be approximated from the Rational Method (Q=CiA): ()containment= peak runoff from Containment Area(cfs) C= runoff coefficient(dimensionless) i= rainfall intensity(in/hr) ^Containment= Containment Area(ac) The"Containment Area”(Acontainment)is the area that will contribute to the runoff through the side lot swales and will need to overtop prior to discharge from the property For Design Example SL2-ALT2: Containment Area 11,132 sq-ft (necessary for Water Quantity Calculations) Pervious Portion 3,751 sq-ft 34% Impervious Portion 7,381 sq-ft 66% Cconteinment= 0.70 (0.3*30%)+(0.9*70%) i25yr= 8.4 in/hr(from FDOT Zone 8 IDF Curve) Acontainmeni= 0.26 ac ()Containment= 1.50 cfs .i -- The approximate peak runoff rate from the containment area will be Qcon,ainment•The"Maximum Containment Elevation"(MCE)of the property can be approximated from the Weir Equation (Q=C,,,LH213) ()Containment= peak runoff from Containment Area(cfs) CW=weir coefficient(dimensionless) L= length of weir crest(ft) H= height of water over weir crest(ft) 0contairen*nt= 1.50 cfs CW= 2.6 (dimensionless)sodded broad crested weir H = 0.08 ft 1.0 inches The Maximum Containment Elevation of the property can be approximated by adding the Height of water over the Weir Crest(H)to the overflow elevation shown on plan view.The City requires 1'of freeboard from the MCE.Thus,from the sketch of SL2-ALT1 with weir elevation 9.5 the MCE=9.5+0.08=MCE=9.58 or 9.6 Preparedby iI TETRA TECH P:\2000``0''85516-08003-NAPLES STORM WATER MANUAL 1SupportDocs\Calcs\Naples-Stormwater Manual-Lot 2 At 2.XLS 3 of 5 'r t r ' 'I • II., + •- u fi n I x1tl'{1}I! if 3ffi Fr YqL 10�<i-� Q Ri oil „,} l' 1f c 7r 1 INI`Ij 1 �y eI I 1:-; r r.. , '7 1 r..Ir C�ddl Ei Sample Lot 2-Alternative 2 (B)STORAGE/QUALITY(GOAL"B") REQUIRED QUALITY(GOAL"B") 1)For Retention Storage(per Sec. 16-115(a)(8)J: (Total Lot Area-Imp. Roof Area)*1/2 inch of runoff For Design Example SL2-ALT2: • 1) 365 ft3 (utilizing retention storage) Note:a)The Water Quality(GOAL"B")volume calculations exclude the roof covered impervious area per Sec. 16-115(a)(B)(b) b)The runoff from the driveway cannot be directed back towards the exfiltration gallery therefore a trench drain has been installed to discharge into a rain garden to collect and treat the pollutants for this problematic graded impervious area.The use of the trench drain and raingarden are encouraged BMP's.[approximately 1640-sf of the driveway can be intercepted by the trench drain] (Total Driveway Area draining to Rain Garden)*1/2 inch of runoff b) 68 ft3 (utilizing retention storage) • REQUIRED STORAGE(GOAL"B") 1)Maximum Underground Retention Storage[per Sec. 16-115(a)(B)(a)]: VMAx= Maximum Volume allowed to store underground(i.e.exfiltration) VMrvc= Total Lot Area*1/2 inch of runoff For Design Example SL2-ALT2: 1) 603 ft3 Prepared by alb TETRA TECH P:12o0-08515-08003-NAPLES STORM WATER MANUAL\SupportDocs\Calcs\Naples-Stormwater Manual-Lot 2 Alt 2.XLS 4 of 5 r :-� t i 1„atm...,i .„.1 I � ',,,,pAitv,1 tt e�..(-41-) h�,l d .z , R :or„ ,„ Mori rll Y�t.��jf(ynjS i i f 1, , J i,d lit = I >', ijrll trakii.' 1`t},�,d I 1 Sample Lot 2-Alternative 2 PROVIDED STORAGE ON LOT 1)Storage through Underground Retention(Exfiltration Gallery) Trench Data Exflltratlon Depth D 1 ft Surface Area ABvii 745 ft2 Fillable Porosity f 0.50 Volume of Void Space V, 372 ft3 Vr=(Ag n)•0 Exfiltration Gallery Volume Vo-enc, 372 ft3 Vtrench=Vpipe+V3 2)Storage through Rain Garden Retention Stage Area Average Incremental Cumulative Area Volume Volume (ft) (Sq.Ft) (Acres) (Ac-ft) (Ac-ft) 6.0 120 7.5 355 237.38 356.06 356 8.0 433 393.88 196.94 553 3)Storage within Conveyance Swale-the volume is too miniscule to gain credit in this example Total Total Required Provided Water Quantity(GOAL"A)5-year/i-hour 1.40 1.80 cfs Water Quantity(GOAL"A”)25-year/24-hour Containment 1.50 1.50 Water Quality(GOAL"B') 365 372 ft3 Underground Retention Storage(Max Allowable) 603 372 ft3 Water Quality(GOAL"B19 Driveway(not required) 68 0 ft3 Note:a)The containment discharge rate for the 25-year/24-hour storm is shown to be less than the rate for the 5-year/1-hour because the Containment Area is less than the Project Area. b)The calculations assume the runoff from the roof will count to non-directly connected impervious area(non-DCIA)because the the roof drains will connect to the exfiltration gallery. c) The Water Quality(GOAL"B')Driveway is not required to be met. It demonstrates the overall effectiveness of Driveway Runoff Collection-"Rain Gardens." Prepared by [" TETRATECH lb P:\200-08516-08083-NAPLES STORM WATER MANUAL1SupporlDocslCalcs\Naples-StormwaterManual-Lot 2 Alt 2.XLS 5 of 5 • M m 1 N N m le- M e aeee. A 9- OHT GN N 0 O 0]N M 0 Q W v ,E S _N N N N v r O N N 1 1r N::-..m g N < r° �i Ni m O1 ,ti rn II O II !r J 8. v CI) II rr ii ti II B U a' n t Z cE a ❑ a 0 g --g w 'III z N U . Ca8 2 Q CWd Z W N D E TY d Z "0Y d n. U . 5q°q � m� W °a `-° a BZW Q� w ym1�� z til ?m0.w g s—a Q z1... o 8 8 Q 8 8 8� � Z pQ N < p; J -1 'Z4 - J a°~Cn ise W ›- Cf 0 F- d O-1 ❑!!1 u- J V ce g zo» OJ 'a U� Q0Q d z °- 0z.r go LL �w rte} w N w0 w% Q}Q Za = �J,J S I- g 0 0 cn 'W> '=>a 3A121a N01371 z E , ° w ❑ z�� ° x4� crreu. �o $ 8� �+ wcsp e4 �ttyy�N - ra T w0 wel � 4I1ia9 _� �V "'•Ss ap - =-w a== m M R.41:4'.771.----' — r. ,,}},.. -s' _ __ o y O N i. S i A!n 11.1'' Z ai .:r 'S S i:^ p o_A4t 3.. — LL N -: , = L '_=-:�`% /v hays W H W_ `�> W r, 0. wg I cI— WM. g- I 5 N< Q � pto 0 �i4 . 1 IryW N LL 0 V 1 461I ^rvl a W 11lM w w a C'O �, N ? Naw o JN 0a J. ' - ! cn > _i F O co co w 01 >d- I -cc z d CV H a l �Z � WI0� o� z ;W�I'� w ~ 43" 45 m W Z �..j` 0w y III m .Q9'L ! 1:k".,yl.. ♦� V 8 8 N iJ '�yy � AI 0 0 0 '' .z w z z z Q . o . ix aul co N a (i) 11/4,i°- 3 "; r N F V K Q 7 Z _ ....� ._... ----x.46 M»61SS.4Z.48S U m o a C o w<IA.N LC a .J J m Q . c z F°m•n. s �ax�� w6 �N J v .. C Z 0_5kcca00 o c)g ''' z< N� Q d ` S o 000th 0_ �o , w r rt r acc N 0_CCw7)O_' NF."-§o❑ z aaplw O SOIVAYO ViflNd:31WVN N38f1 OWV L10111110AV1 0MO'L 101 oiNNswattomr510V3i1WINVY4 N31VM VO1O1$S31.dIN-F00001W911O-DOVVd'ONN1V1O TW BO:BYOL B00L'0Z I Y1.P.I.p"M • • PI N '. m r4 a r4 IN" m z ccQ ` W D li 0 Q N O m (9 o a <a ry ` L 11 1— i w y rn ( u_ m z .. o ooz= s s a v >azz z Ct o" 7 z0 l''-':' tu1: ird -Mzw• 4D U.1 ze N N0 Ilib] � 0 , �QZ o W � Z u It u l u I I' -I Q Z U.IC .'y w ! 1 g� aa ° w wu.o l F'C.0 w Ce 2a U° 71.1 04( Q �' 04 ,0�'.� LLI co IP .'It 4 egii W z I 'h Z ILI ` II; a ,2.. • zW w g 0 A6 zz i rzi o a z - rc 'a . M zw 2 as o 3 - K�Jy^o] �. 1, 3 h m..=if ¢ t�{ C b i 2 0. o t z ����S�S���®mom Oct —__3_—_'4& ',,.f ry„ w . .. ri :::,•15....1,.. .of<�4f: .\. C7s{tt,:•.*x.y'.F,. -1”— ! i. .ii to �`t,';:i.;:. `ii .G. Q 7n O o `▪ �ti" '}~ :rf!• ?✓ to tiw y,•,C J �f`�^[yk.i �EI00M®IMM ®ssomme▪ f 7 to o w b • /,',4e47,-:.;: W V , ih 7.' 501YAVO vinve:31•011.1M3sn J30-Z11Y Z1O1,1f1OAY1WATT 1.1.1.1...S1.11liMySICIVO11f1NV1 b31YM MAWS S37dYN•£009011.990-0021Fd,DNIMYbO WY CZ,CYOL OO OZ PAN.1•P OP.M BMP Credit Applicability Credit Credit Allowance Credits Required Justification Explanation Policy 1 25-Year Storm Freeboard Compliance •12"(as written) • 9"1.0 SC ▪ 6"2.0 SC 2 Maximum Underground Storage •0.5"(as written) •2x 1.0 SC •3x 1.5 SC . •4x2.OSC •5x2.5 SC 3 Maximum Exfiltration Estimated Seasonal HIgh •24"(as written) Water Table(ESHWT) •18"0.5 SC Freeboard •12'1.0 SC • 6.1.5 SC 4 Minimum Exfiitration Ground Cover •12"0 SC(recommend) • 6"0.5 SC • 3"1.0 SC ▪ 0"1.0 SC(under slope) • SUNCOA5T r ;t • \ ENGINEERING } !ING 4t t �/STRUCTURAL„ SPEC 4 RESIDENCE WATER MANAGEMENT CAA.CULATIONS. C0 tkhNT,r`j') • _ Match 6,2048 I. 2 L( /I DRy . (r'' k) (A is' e -1&._- i' � F, b.a.T . p ��Ls l Cox-- ' 0 j Z = 3.1 Lam/ or+ Q = -G S = th/_ t S', 8WGi t DLlusc +*Iw 0.irr4 Liam.' 7ti t - ,t7.34ck a 3G+gt -- (0.‘) (3,01)(34'L6 o.s93 0.'3 �`... 0.6o • Z. C k k M S-r-tr4 G') (o" 4-44.Vee(" • A,., it /.4 o,s5' Z b� G �?• c. * tf2.1 46.44- C '4 6 114 61)661) 2.0"C—;T-0 420L6XL (A)312 2.73 c- S >> o..c ) 432-2 _ 7.Duct ?cpt. 6:4.0 ' it5s Lc.a.o 4 ° Cznig.-1 he) 4?„6LL C c - (e9,Att.-1v ;,0. 61k SF > o. es-a- t vK ,mop.. . �raF.cs c-ssE.s =-Kc VZ 6, eh l�y� L ,U,,; /6L r- 0.033x 4 cel = O. 131i1* A th.-v4 46 V— .$off ; 1� �,Sr /Tr o fa- �S' ,o ;1n4�f�2�o'� ?41,3) b.Z2 � f to #. t.osse5 �i, = io•ga(L) Q/G''�'-ed,,,yl r- 02_0) td' $1 9130 Galleria et.Suite 109,Naples;Florida 34109 . C� 41 R 7�3 .6nTorii 1r we/pp � 1 � ..�.r Phone(239)593 2071 Fax(239)593-2091 , rt,1 . Maw E-mail:sceng(ao1 Bora d!, Ifsau,L �'.a o8? - 0,1,33-f o2Z.' = 361 6i,An o.ft ' /'_ .,,� e% .. . r i i -y– a ki. �_ � _ . 11 , 111 i r