11-20-2017 Planning Commission Packet

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IVY PLACE - PROPOSED CONDITIONS 17059 - IVY PLACE - PROPOSED Type 1124-hr 100-YEAR Rainfall=7.50" Prepared by Microsoft Printed 7/17/2017 HydroCAD® 10.00-19 s/n 02202 ©2016 HydroCAD Software Solutions LLC Page 37 Summary for Pond 1P: UNDERGROUND FILT DET POND 1 Inflow Area = 0.119 ac, 50.51% Impervious, Inflow Depth > 5.84" for 100-YEAR event Inflow = 1.20 cfs @ 11.97 hrs, Volume= 0.058 af Outflow = 0.76 cfs @ 12.04 hrs, Volume= 0.057 af, Atten= 37%, Lag= 4.3 min Primary = 0.76 cfs @ 12.04 hrs, Volume= 0.057 af Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 931.34' @ 12.04 hrs Surf.Area= 704 sf Storage= 527 cf Plug-Flow detention time= 27.3 min calculated for 0.057 af(98% of inflow) Center-of-Mass det. time= 20.8 min ( 765.0- 744.2 ) Volume Invert Avail.Storage Storage Description #1A 930.00' 323 cf 11.00'W x 64.00'L x 1.50'H Field A 1,056 cf Overall -248 cf Embedded = 808 cf x 40.0%Voids #2A 930.00' 248 cf CMP Round 12 x 15 Inside#1 Effective Size= 12.0"W x 12.0"H => 0.78 sf x 20.00'L = 15.6 cf Overall Size= 12.0"W x 12.0"H x 20.00'L 5 Rows of 3 Chambers 9.00' Header x 0.78 sf x 2 = 14.0 cf Inside 571 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 930.00' 2.0" Round Culvert L= 26.0' RCP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 930.00'/929.77' S= 0.0088 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.02 sf #2 Primary 930.25' 4.0" Round Culvert X 2.00 L= 26.0' RCP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 930.25'/929.77' S= 0.0185 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.09 sf Primary OutFlow Max=0.76 cfs @ 12.04 hrs HW=931.34' (Free Discharge) -1=Culvert (Barrel Controls 0.06 cfs @ 2.95 fps) 2=Culvert (Barrel Controls 0.70 cfs @ 3.98 fps)