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Subcommittee Agenda 09/12/2016 Agenda Development Services Advisory Committee Land Development Review Subcommittee Monday, September 12,2016 9:00 a.m.—10:00 a.m. GMD Building- Conference Room 609/610 1. Call to order 2. Election of Subcommittee Chairperson 3. Approve agenda 4. Old Business a. Approval of minutes: i. February 29, 2016 ii. April 13, 2016 5. New Business a. Staff presentation i. Review of current standards ii. Evaluation of 1 year of lot coverage reviews iii. Stormwater/lot coverage in other communities iv. Potential alternatives v. Next steps b. Committee questions and initial feedback 6. Next meeting date: September 19, 2016 7. Public comments 8. 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C-dS21 ' W --- a/ K 6Z 21S Nuiii I Qv- Z CD � J c LLp ' d CNI W W d Q n cE C 1 CC o G ' I Y al m N U.'9 WI l E O W Z aI I J LL LL LL II I x W 1 cc IQ Wim. I C, w -o x m J M Q ` N/ I, C 3 Q N M V L° p G d Z LL ll Ll LL lL O 1 2 xu°. z4A viV I- 3 3 1 7 , / i CO 04 %• / w f'1w tib/ I /tv u .. i r LL z' w LL _ . f s rix_ ‘ z S ¢ le , w IS ISI S • A/ LL U) Pi*9; 5 £-ASS LL W 4 — +,/ � _ , i 2 NZ 6z as — — IIX ii 1 '''k'-7.1101,re Ne \Q r f ,�� ' p an N LL t` re W Q —) 111 a) t 1 Cl.. m ® is. C a' a G O. 5 _ O u.CO 'i; w d O W z z �� c Z ni, Q iL LLL LL LL �� �� W a m cc or W w c2 g M — J eh Q ce ' S / LLu. 0 N M V tfi o ZLLLui iLLLLLen L O O o e e to C we 5a z Vo " I 3 Pan Am AVE 'tes,ca An,CA ParkAVE ___..... _-_ 111 — CC Manor Lake DR STORMWATER PLAN: RMF-6 mperiat DR • • I Encore WAY • Required Z` _,1 Colliers Reserve DR ZONING: -1 RSF-1 RSF-6 \RSF-3 -ti RSF-2 RMF-6 RSF-3 '` RMF-12 1 RSF-4 RSF-4 RMF-16 RSF-5 iver CT / hones AVE I. -_.__—_ Walkerbilt RD I w (DatatSource:Growth Management Department) 11 � , 1 Roma CT se i Captn Kate CT 'A RMF-16 �m�o $ RSF-4 i cL ,Q, N o Crosspointe DR ___ ____Bluebift AVE _ _ _ __-__ 1+it,AVEN 111TH AVE N oImmokalee RD h Ptami AVE t1Oth AVEN --' �' ,3 ngo m • 109th AVEN • v � •Sron AVE _ 01D$th AVEN ¢ Egret AVE 107th AVE N U 9ACreekside BLVD • m • m • •Conners AVE 106th AVEN • • • 105th AVE N• ee VE Seabee AVE•di 104th AVEN E nr9ress ilk, seaveew Germain AVE 103r1 AVEN N Cbnnei OR •eaguif AVE 102nd AVE N ill E pVro E 1A1st AVE N • Bayview AV 0 100th AVE N A 70 `"' Trade Winds AVE rRMC-C , 99th AVE N RMF-6 >=G 4 O It 70 Lagoon AVE iz �� � O N • 8th AVE N 'd,� A 6 I m � a -rtGayside AVE 97th AVEAVN e'k, 91 � % II Plne AVE 96th AVE NO n 0 W • 95th AVE N Oak AVE Spanish Moss TEL 0 c 94th AVEN 0 ,m CT • 33rd AVEN • o g 44 m_ c, 92nd AVE N to,iY 18 A m § Beachwatk C!R 91st AVE`N Gutf Pavilion DR �¢ o g1%'4,6 006° n----4;----- Reef Point CA j 4 ,N AN -I-_T Gra hieD 13E r- ZQ q CH RD — Hickory RD"� Zoe Z , o ,-, 2 cot`s 4°l' Jeo�o o¢ E 1 i 7"Pei°RD ,40° a c a °; 3 E! L1 .A R �i ,m 2� e ~I . n ,I > ZmF •i -n RSF-1 ° m L a g. ? C m - O 3 a 1 tr I a.0 m cR�cm, A O i Sand Pine DR C 0 N e�DR ...1,.?. c .v..:x ,'" o ‘be' 9R _E v W'i�0E ym 1eeo-6 8 Banyan RD P. �`�yy//- m O S Gdt"ocQ� Woodhaven LN •S 4% Shadow Shadow Lake LN 1 1) m • NAPLES PARK AREA STORMWATER PLAN REVIEWS G 0' - "M (JUNE 2015 - JUNE 2016) GIS MARRING'BETHYANG,AICD QC,Copy, GROWTH MANAGEMENT DEPARTMENT DATE:JULY.ROW Yesica Ann CIF? - i STORMWATER PLAN: RMF-6 Manor Lake DR Imperial DR C Encore WAY • Not Required Z Colliers Reserve DR ZONING: -ICI RSF-1 - RSF-6 \\RSF-3 ti4/1 RSF-2 RMF-6 RSF-3 RMF-12 RSF-4 RSF-4 RMF-16 i RSF-5 river CTy�% -..-_ hOres'7 ., Walkerbitt RD f `7 (Data Source:Growth Management Department) 0V.1 Roma CT set Captn Kate CT d Re I9� RMF-16 c¢0Q i RSF-4 a O Crosspolnte DR Bluebill AVE ',�,,_:N 111TH AVE N ._ _____.__._ __.... lmmokalee RD FlamingoEi AVE 110th AVE IN ?� m s 109th AVEN m m Heron AVE N _ ' • 0106th AVE1. x 4 Egret AVE 107th AVE® • u ni Creekside BLVD 4. tn Conners AVE • 106th AVEN • • 1051h P.YP.. VE Seabee AVE NC, ® E Beor9 ss&A,,,seytlreezeP • Germain AVE 103rd.N N Cha+l Seagull AVE 102nd AVE N ' E •ayview AVE Willet AVE t015'AVE N �.- I T �) 100th AVE N ■�/"�� /Ka -. /y Trade Winds AVE RMF-6 r �L O 99th Q '� Lagoon AVE +•: ;AVE Z e'7y %A m 2 `_ e ° m v, y O-rt Bayside AVE 97th AVE N ,;:._��� �°';rh ilt_ 8 m • m 3. �i_4 Pine AVE 96th AVEN e/L4 crt W • 95th AVE N I" Oak AVE I Spanish Moss TRL 94th AVEN ct 0 Palm CT ® 0 93rd AVEAVEN® a c 92nd AVE Zeta OR d C N 0 ` qy A s I BeaahwaUk CUR 91st AVE N Ga)ravilion DR o� R y r 1°- = v``��Seed V., -La hi--_,----_, '.'--_, 4 e'°< 4]0.00 rd _ Reef Point CUR A Gran°/5/e V Np„Rai._.- n rb,itB OR Cc Cc a ALT 8E--__� _—ea-n RD __ z1 ACH RD z--- o NickoO'RD�� O 7t .l z yZ C's' °$ ,0,.- r ` rePefo RD E o °2 § i� -451 8 F T RSF-1 o p A o A L. S Q m i V- A c E o_ g a P'4 C r a �,C N o U , Lr N S^. �°be O S•4P, c c ,,'��F ° 'ye Gleeoaea m M Banyan RD =1� West gt `r!" n o�Q Woodhaven LN ?,� S 12 Gg� N� o Shadow Lake LN C m F' NAPLES PARK AREA STORMWATER PLAN REVIEWS G o, = M,r. (JUNE 2015 - JUNE 2016) GIS GROWTH ANAGEMEHTDE CP AR C C GROWTH MANAETH YANG, DEPARTMENT DATE:JULY.2016 6.05.01 - Water Management Requirements A complete stormwater management system shall be provided for all areas within the subdivision or development, including lots, streets, and alleys. A. The system design shall meet the applicable provisions of the current County codes and ordinances, SFWMD rules and regulations pursuant to Florida Statutes, and the Florida Administrative Code, and any other affected state and federal agencies' rules and regulations in effect at the time of preliminary subdivision plat submission. Water management areas will be required to be maintained in perpetuity according to the approved plans. Water management areas not maintained will be corrected according to approved plans within 30 days. B. Where stormwater runoff from outside the subdivision or development historically passes on, over, or through areas of the subdivision or development, such runoff shall be included in the stormwater system design. The system shall be designed for long life, low cost maintenance by normal methods and provide for optimal on-site detention of stormwater runoff and groundwater recharge in accordance with applicable County and SFWMD regulations. C. Any structure with an outside wall which is closer than 10 feet from a side property line shall install properly sized (minimum twenty-four-square inch cross-section) gutters and downspouts to direct stormwater away from neighboring properties and toward front and/or rear swales or retention/detention areas. D. In-ground percolation type retention systems such as rock trenches, exfiltration trenches or beds, infiltrator type systems, gallery type systems, etc., shall not be used to achieve water quality retention for residential subdivisions. Rear yard open retention systems shall likewise not be designed to achieve water quality retention on projects submitted after January 1, 2002. All retention systems for projects designed after January 1, 2002, shall be on common property owned and maintained by a homeowners'association or similar entity. E. Any canal which forms a part of the public water management system shall be dedicated for care and maintenance per the requirements of the governmental agency which has jurisdiction.Canals located entirely within the subdivision and which do not form a part of the public water management system shall be dedicated to the public, without the responsibility for maintenance, as a drainage easement.A maintenance easement,of a size acceptable to the County Manager or designee or other governmental agency with maintenance responsibility, shall be provided adjacent to the established drainage easement, or the drainage easement created must be of a size suitable for the proposed canal and its maintenance. F. Stormwater Retention/Detention Design for Single-Family Dwelling Units, Two-Family Dwelling Units and Duplexes. 1. Applicability. Any application for a building permit to allow the development or redevelopment of a single-family or two-family dwelling or duplex submitted after July 1, 2008, except for the following conditions: a. Any application within the boundaries of development projects that have: (1) been permitted by the South Florida Water Management District for Surface Water Management or Environmental Resource Protection and (2) have a central surface water management collection, storage, treatment and discharge system; b. A one-time addition is allowed for certain sized homes, as set forth below; or c. An application accompanied by a stormwater management plan, signed and sealed by a registered Florida Professional Engineer. Page 1 Table 6.05.01 F. Lot Size Lot Coverage Impervious Area Coverage Under 11,000 sq.ft. 25% 40% { 11,000 sq.ft.to 52,999 sq.ft. and 2,750 sq.ft. +5%of area in 4,400 sq.ft.+5%of area in 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.and 2,750 sq.ft.+2%of area in 4,400 sq.ft.+2%of area in less than 100 ft. in width excess of 11,000 sq.ft. excess of 11,000 sq.ft. 4,850 sq.ft. +3%of area in 6,500 sq.ft.+2%of area in 53,000 sq.ft. and over excess of 53,000 sq.ft. excess of 53,000 sq.ft. 2. The maximum allowable ratio of lot coverage and impervious area coverage to the total lot area shall be as provided for in Table 6.05.01 F. unless accompanied by an engineer's analysis as specified below. a. The site drainage analysis shall include water quality calculations to SFWMD standards and water quantity calculations done to accommodate the runoff, from area in excess of the above ratio,from a 5-year 1-day storm and shall include a percolation test done by a qualified engineer or technician. If the site will use a drainfield/septic tank for sewage treatment/disposal, the wet season water table calculations for drainage must match that used for the drainfield design. b. The application site plan shall list all required separation distances between wells, drainfield systems, and stormwater retention/detention areas. The calculations may be done on the site plan or may be in a separate Engineer's report, but must be signed and sealed by the Engineer. c. The water surface area of swimming pools and ponds is not considered as impervious area for the purposes of the calculations in Table 6.05.01 F. 3. A one-time addition to an existing residence will be allowed after July 1, 2008. The addition will be limited to 3 percent of the lot area up to a maximum of 1,000 square feet as long as that one-time addition does not exceed the area in Table 6.05.01 F. by more than 3 percent of the lot area or more than 1,000 square feet. G. The design of the stormwater management system shall fully incorporate the requirements of the Interim Watershed Management regulations of LDC section 3.07.00. H. Street grades. Street grades must be determined in relation to the drainage facilities for the subdivision and must not exceed four percent nor be less than 0.3 percent, unless otherwise approved by the County Manager or designee pursuant to section 10.02.04 of the LDC.Street grades must be shown on the development plans by direction and percent of fall on the road profiles. I. Rainfall and runoff criteria.The system must be designed for"design floods"resulting from rain storms and antecedent conditions for all system components in accordance with current Collier County and South Florida Water Management District criteria. Page 2 1. Runoff coefficients. Existing land usage will be considered for the selection of proper runoff coefficients within the drainage basins involved,whether within the subdivision or development or not. 2. Lakes.Artificial lakes and retention basins proposed as part of a stormwater retention system for on-site water management must be designed and shall be consistent with other ordinances or regulations of Collier County, the state or the region. All lakes will be set back from abutting roadways or intersections pursuant to the design standards established in sections 22-106 through 22-119 of the Code of Laws and Ordinances. J. Stormwater outfalls. Stormwater runoff must be conducted to positive outfalls that can be permanently maintained, practicably and legally. Outfalls to existing waterways, canals, preserve or conservation areas, lakes or storm sewers will be acceptable provided it can be demonstrated through a professional engineering study to the County Manager or designee that such receiving systems have adequate capacity to receive the proposed quantity and quality of the additional flow. 1. Side ditches or swales along public or private roads shall not be accepted as suitable positive outfalls except as may be specifically accepted under the provisions of the LDC by the County Manager or designee and by the Florida Department of Transportation, if applicable.The storage of stormwater runoff in other existing or proposed ditches or swales within a public or private right-of-way will be permitted for volume storage when approved under South Florida Water Management District design criteria, but will not be utilized to satisfy the stormwater storage (quality) requirements of a development's master water management system. K. Major waterway. Improvement or establishment of major waterways and canals will be developed in full accord with applicable stormwater management criteria. Engineering data, criteria, and suitable calculations shall be submitted to the County Manager or designee prior to approval of construction plans. 1. Roadways over major waterways will be structures approved by the County Manager or designee,sized to maintain flow capacity, designed to assure long life and minimal maintenance. Construction must meet all current Florida Department of Transportation Standard Specifications for Road and Bridge Construction, as amended, unless otherwise approved by the County Manager or designee pursuant to section 10.02.04 of the LDC. L. Outfall ditches and open channels. Unless otherwise approved by the County Manager or designee pursuant to section 10.02.04 of the LDC, side slopes no steeper than four to one will be allowed. Protection against scour and erosion will be provided as required by the County Manager or designee. M. Roadside swales. 1. Design. In the interest of preserving the existing natural groundwater levels, roadways will not be designed so as to cause the significant lowering of the water levels existing in the area prior to development. Roadside swales and ditches may be permitted within street rights-of-way where the use of roadside swales can be justified to the County Manager or designee through a written report prepared by the applicant's professional engineer. Swales, where permissible, will have side slopes no steeper than four to one and they will not be utilized to satisfy the stormwater quality (volume) requirements of a project's master water management system. Where flow velocities in excess of four feet per second are anticipated, urban right-of-way sections will be required. 2. Erosion protection. All unpaved areas within the permanent right-of-way must be provided with permanent erosion protection, such as native vegetation or turf. Swale ditches shall be sodded a lateral distance extending from the road pavement to the top of the swale ditch backslope. Where valley guttered sections are used for drainageways, turf protection must be placed from the edge of the gutter to the outer limits of the right-of-way. If seeding is utilized, then mulching in accordance with the Florida Department of Transportation standards will be required. Additionally, if seeding and mulching are utilized, then a strip of sod one foot wide will be placed along the face of the pavement or curb section and over the invert of any approved swale section Page 3 within the runoff flowway. All swales subject to erosion velocities will have adequate erosion protection in the form of riprap or other applicable like methods. 3. Driveways across swale ditches. Driveways across permitted swale ditches must have placed beneath them drainage pipes of adequate size and type approved by the County Manager or designee, based on the capacity requirements calculated by the applicant's professional engineer for the development's master water management system. N. Street drainage. Street drainage within the road right-of-way through grassed swales will be permitted for rural cross sections only except where velocities in excess of four feet per second are anticipated.The flow from these swales or other types of drainage facilities will be diverted to natural percolation areas, artificial seepage basins or artificial lakes of at least sufficient capacity to comply with the criteria of Collier County and the South Florida Water Management District. Other equally effective methods of returning cleansed waters to the aquifer will be acceptable upon prior review and approval by the County Manager or designee. 1. Existing natural lakes may be used as detention areas provided that they have adequate storage capacity and that pretreatment measures approved by the County Manager or designee are taken to prevent pollutant matter from entering the lake. Positive outfall drainage facilities will be provided away from all percolation areas, seepage basins, detention areas and artificial lakes to handle the runoff from storms which exceed the required design storm event in duration and/or severity. O. Percolation areas. The actual area required will depend on the percolation rate for the soils at the specific site and the manner in which the site is developed in accordance with Collier County and South Florida Water Management District criteria. 1. Underground drainage. Where drainage plans provide for, or it is so directed by the County Manager or designee, the collection of stormwater in underground pipes, inlets and other appurtenances for conveyance to an intermediate or ultimate outfall, the following minimum design criteria will be observed: a. The minimum pipe used within a publicly maintained stormwater collection system will be 15 inches in diameter. b. Inlets will be spaced at such intervals and in such a manner to allow for the acceptance of 100 percent of the ten-year, one-hour storm runoff. c. The distance between terminating and intermediate structures must not exceed those required by the Florida Department of Transportation, pursuant to Florida Department of Transportation Drainage Manual, Volumes 1-4 (1987 edition or latest revision). d. The stormwater, underground collection system, must be so designed that the elevation of the hydraulic gradient during a ten-year,one-hour storm event is never higher than the crown elevation of any publicly maintained roadway in the system. e. The pipes must be designed to minimize sediment deposits. f. The pipe materials must meet the requirements set forth in sections 943-948 inclusive of the current edition of the Florida Department of Transportation Standard Specifications for Road and Bridge Construction. Only concrete pipe or other pipe materials approved by the County Manager or designee may be used in tidal or salt waters. g. All drainage pipes must be fitted with headwalls, endwalls, inlets and other appropriate terminating and intermediate structures. P. Stormwater disposal. The method of ultimate disposal of stormwaters will be dependent upon the soil characteristic underlying the development or subdivision. All stormwaters will be subjected to treatment for the removal of petroleum residues, oils, suspended solids and other pollutants found in stormwater runoff. The method of treatment will be determined by the applicant's professional engineer responsible for the preparation of the stormwater management plans and specifications, and will be subject to the approval of the County Manager or designee and the concerned state agencies. Page 4