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201403030758012793000 Gulf to Bay Boulevard, Suite 201 -� Clearwater, FL 33759 (727) 796 -1926 www.synergycivileng.com Certificate of Authorization No. 27692 SYNERGY Civil Engineering, Inc. Pit Prepared For: Parking Lot Approving Agencies: Southwest Florida Water Management District -h >n �,r; 4 Revised: ii � � jj� 11 W I' I FRIN PJAII, kl-i L, - PREPARED FOR: Mainstream Partners Vill LTD 101065 NW 191h Street Miami, FL 33172-2529 SUBMITTED BY: Synergy Civil Engineering, Inc. 3000 Gulf to Bay Boulevard, Suite 201 Clearwater, FL 33759 ,\\\\\\\0\\\jI III I IIIIIII NO� E L MichaQ P,,lialrn4TViFp (Lip'. Ab13743) 0 el Al. N ENGN I I if I I I I 3000 Gulf to Bay Boulevard, Suite 201 SYNERGY Clearwater, Florida 33759 Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B: CLEARWATER, Fl. 4. NARRATIVE A. Introduction B. Historic & Existing Conditions C. Proposed Conditions D. Conclusion 11. EXHIBITS A. Location Map B. GIS Aerial Map — Historic Conditions C. USGS Map Ill. DRAINAGE CALCULATIONS • Run off Coefficient Calculations • Attenuation & Weir Calculation per City of Clearwater • Stage/Storage and Treatment Calculation • PONDS software draw down calculations 3000 Gulf to Bay Boulevard, Suite 201 SYNERGY Clearwater, Florida 33759 Pa g e3d 10'-� Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B: CLEARWATER, FL i f r; � MAINSTREAM PARTNERS VIII LTD is proposing to construct a temporary parking lot located at the northeast corner of Coronado Drive and 5th Street (vacant no address, Parcel ID SEE PLAN COVER SHEET) which will include a storm water management system for treatment, attenuation (dry pond), and landscaping on a 0.96 acre + /- parcel of land. MAINSTREAM PARTNERS VIII LTD will be the Operation and Maintenance Entity and it will be shown that the treatment and attenuation requirements will satisfy the criteria for both the SWFWMD and the City of Clearwater. B. HISTORIC & EXISTING CONDITIONS The 0.93 acre site located at the northwest corner of Coronado Drive and 5th Street is currently vacant. There is no existing storm water management system in place for storm water treatment or attenuation. Storm water runoff from the site is directed towards the property boundaries and flows off site into the City of Clearwater's street right of way and storm water system. The site does not contain existing wetlands or surface waters. The site was previously (2009) occupied by (5) five buildings and was essentially 100 percent impervious. The current owner demolished the (5) five existing buildings and is in the process of permitting the site for a new hotel building. It is anticipated that construction of the new hotel building will begin in 2016. lellr r 6, r MAINSTREAM PARTNERS VIII LTD is proposing to construct a parking lot at the northeast corner of Coronado Drive and 5th Street (vacant no address, Parcel ID SEE PLAN COVER SHEET) and will include a storm water treatment and attenuation system (dry pond), landscaping, walkways and associated utilities on a 0.93 acre + /- parcel of land. 3000 Gulf to Bay Boulevard, Suite 201 SYNERGY Clearwater, Florida 33759 Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B:CLEARWATER, FL Dry Pond: SWFWMD: • Treatment Volume =Y2" over the entire site (Discharging intoCitySystenm). • Full treatment volume recovery within 72 hours — PONDS V3.2 software. Note: S\0FVVKAD Criteria was confirmed bm District Engineer, Reference Appendix B. City of Clearwater: • Treatment Volume = Y2." over the entire site (Discharging into City System). • Full treatment volume recovery within 24 hours — Modeled in PONDS V3.2. • Existing Impervious "C" Value =Y2 /0.95\ =O.47S. • Attenuation — control peak flow rate to Pre-Development flow rate due to direct discharge to City System. • Meet 6" Freeboard Requirement. The sLornlVvater management systems have been designed tm meet the treatment requirements ofthe SWFVVKU[} for a minor system and the treatment and attenuation requirements of the City of Clearwater. K��UK�� 3000 Gu|f to Bay 8ou|evard, Suite 2O1 ��KU'WK_K��K Clearwater, Florida 33759 Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B: CLEARWATER, FL A. LOCATION MAP B. GIS AERIAL MAP C. USGS MAP 3000 Gulf to Bay Boulevard, Suite 201 SYNERGY Clearwater, Florida 33759 Civil Engineering, Inc 3000 Gulf to Bay Boulevard, Suite 201 s »«m E Fl G Y C|earxxeter, F|orida 33759 'V Tbf Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B: CLEARWATER, Fl. B. AERIAL MAP - RECENT 3000 Gulf to Bay Boulevard, Suite 201 SYNER"GY Clearwater, Florida 33759 pq e Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B: CLEARWATER, Fl. 3000 Gulf to Bay Boulevard, Suite 201 SYNERGY Clearwater, Florida 33759 Civil Engineering, Inc STORM WATER MANAGEMENT REPORT- PARCEL B: CLEARWATER, FL I Civil Engineering, Inc 3000 Gulf to Bay Boulevard, Suite 201 Clearwater, Florida 33759 Page 0 of 10 IvXgC� `e Elevation Area Volume Cumulative Volume (Ft.) (Sq.Ft.) (Cu.Ft.) (CuSt.) 3.25 808 0 0 4.00 1721 948 948 4.38 2183 742 1690 4.50 2384 274 1964 4.70 13362 1575 3539 REQUIRED TREATMENT VOLUME= 1689 SITE AREA 1/2" RAINFALL VOLUME 40,544 REQUIRED ATTENUATION VOLUME= 3253 Treatment Elevation Attenuation Elevation s` Q ;,. Omi Ln u c u c u C; u Obi r;s z p z p c y u m z u 00 is ` W W u g u n Y r u m °o m °o LL O W O u c ci u o u m �f s a a 'S m LU o ci _. N u to -1 M, C5 o } Ln z u C C V CA C ~Q Vim, W W W W kya _`vZ uZ �J nv ui C cc a r.: G p Zc m zO) p py uj ui uj °° u cc Lb u a ra STORM WATER MANAGEMENT CALCULATIONS PREPARED FOR PARKING LOT B Required Volume 25 Year 60 min Storm V= (Cpost -Cpre) x A x I x 3600 sec. PHASE N0: II Q =CIA Q PRE= 1.61 CFS Q POST= 2.48 CFS PRE - DEVELOPMENT "C= 0.48 POST - DEVELOPMENT "C"= 0.74 AREA (ACRES)= 0.93 INTENSITY (IN /HR.)= 3.60 VOLUME= 3,153 F Required Stc Volume Duration = 120 min. Q = POST Q = PRE Enter L & H in inches C= 3.13 L= 32 inches H= 3.6 inches Q= 1.37 CFS WEIR FLOW CALCULATIONS PRE-DEVELOPMENT PEAK FLOW = 1.61 CFS Permeability Calculations using Simplified Kv and Kh Approximations 02-Mar-14 Project Number : 90= 030 -82 . Design By. MO. Project Name Parcel B'Patking ]L'4 oi. Brief Description Simplified P6 ilffitCal6ulati6hs:,:% e From Soils Report: Saturated K, = 47.2 in/hr Proposed Value : Saturated Kv = 23.6 in/hr Average Unsaturated Kv — 2/3 Saturated K, Unsaturated K, = 0.6667 23.6 in/hr 15.73 in/hr Unsaturated Kv = 31.47 ft/day Average Saturated Kh — 1.5 Saturated K, Saturated KI, = 1.5 23.6 in/hr 35.4 in/hr Saturated Kh = 70.8 ft/day Average Unsaturated K, 31.5 ft / day Average Saturated Kh 1 70.8 ft / day Project Data Project Name: Simulation Description: Project Number: Engineer : Supervising Engineer: Date: Aquifer Data PONDS Version 3.3.0229 Retention Pond Recovery - Refined Method Copyright 2008 Devo Seereerarn, Ph.D., P.E. Parcel B - Parking Lot Treatment Volume Recovery 90-030-82 Michael J. Palmer Michael J. Palmer, P.E. 02-27-2014 Base Of Aquifer Elevation, [B] (ft datum): Water Table Elevation, [W1] (ft datum): Horizontal Saturated Hydraulic Conductivity, [Kh] (ft/day): Fillable Porosity, [n] (%): Vertical infiltration was not considered. Geometry Data Equivalent Pond Length, [L] (ft): 155.0 Equivalent Pond Width, [W] (ft): 20.0 Ground water mound is expected to intersect the pond bottom Stage vs Area Data Stage Area (ft datum) M 3.25 808.0 4.00 1721.0 4.38 2183.0 4.50 2384.0 4.70 13362.0 5.00 13973.0 Discharge Structures Discharge Structure #1 is inactive Discharge Structure #2 is inactive Discharge Structure #3 is inactive 1.20 2.50 70.00 20.00 Parcel B - Parking Lot 03-02-2014 18:06:01 Page 1 PONDS Version 3.3.0229 Retention Pond Recovery - Refined Method Copyright 2008 Devo Seereeram, Ph.D., P.E. Scenario Input Data Scenario I :: 1689 ft3 slug load Hydrograph Type: Slug Load Modflow Routing: Routed with infiltration Treatment Volume (W) 1689 Initial ground water level (ft datum) default, 2.50 Time After Time After Storm Event Storm Event (days) (days) 0.100 2.000 0.250 2.500 0.500 3.000 1.000 3.500 1.500 4.000 Parcel B - Parking Lot 03-02-2014 18:06:02 Page 2 PONDS Version 3.3.0229 Retention Pond Recovery -Refined Method Copyright 2008 Devo Swereemmmm" Ph.D., P.E. Surnrna!y of Results :: Scenafid I :: 1689 fP slug load Time Stage Rate Volume (hours) datum)� (ft3/S)�� (ft3)�� Stage Minimum 06.000 2.76 Maximum 0.002 4.38 Inflow 24.000 Rete - Moxhnum - Puodkm 0.002 Rate - Maximum -Negative None Oumu|atixeVp|ume - MeximumPooitixu 0.002 Cumulative Volume - Maximum Negative None Cumulative Volume ' End ofSimulation 96.000 Infiltration Roba - Moxhnum - Poobive 0D02 Rate - Maximum ' Negative None Cumu|oUvaVo|uma - MaxmumPoedkve 24.000 Cumulative Volume - Maximum Negative None Cumulative Volume - End ofSimulation 98.000 Combined Discharge Rate - Maximum -Positive None Rote - Nlaximum'NegoUue Nona Cumu|obveVo|ume - MoximumPooitima None Cumulative Volume ' Maximum Negative None Cumulative Volume - End ofSimulation 96.000 Discharge Structure 1 -inactive Rote - Maxhnum - Poadke disabled Raba Maximum disabled CumubUveVoiumo - MaxmumPooitiva disabled Cumu|oUxeVo|ume - YNeximumNaub disabled Cumulative Volume - End ufSimulation disabled Discharge Structure 2 -inocbxe Rote - YNaoimum - Pooitixe disabled Reto - [Nnximum'Negobve disabled Cumulative Volume 'Maximum Positive disabled Cumu|advaVo|uma - NYmximum Negative disabled Cumulative Volume - End ofSimulation disabled Discharge Structure 3 -inocUxa Rate - Maximum -Positive disabled Rate ' Maximum -Negative disabled Cumulative Volume - Maximum Positive disabled Cumulative Volume - Maximum Negative disabled Cumulative Volume - End ofSimulation disabled Pollution Abatement: disabled 38 Hour Stage and Infiltration Volume 36.000 3.00 72 Hour Stage and Infiltration Volume 72.000 2.82 281.5000 None 1689.0 None 1689.0 0.6905 None 1689.0 None 1689.0 None None None None 0.0 disabled disabled disabled disabled disabled disabled disabled disabled disabled disabled disabled disabled disabled disabled disabled 1689.0 1689.0 PomeB'PorkingLot 03-02-2014 18:06:02 Page