11-20-2017 Planning Commission Packet

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IVY PLACE - PROPOSED CONDITIONS 17059 - IVY PLACE - PROPOSED Type 1124-hr 1-YEAR Rainfall=2.47" Prepared by Microsoft Printed 7/17/2017 HydroCAD® 10.00-19 s/n 02202 ©2016 HydroCAD Software Solutions LLC Page 11 Summary for Pond 1P: UNDERGROUND FILT DET POND 1 Inflow Area = 0.119 ac, 50.51% Impervious, Inflow Depth > 1.32" for 1-YEAR event Inflow = 0.30 cfs @ 11.97 hrs, Volume= 0.013 af Outflow = 0.19 cfs @ 12.05 hrs, Volume= 0.013 af, Atten= 38%, Lag= 4.4 min Primary = 0.19 cfs @ 12.05 hrs, Volume= 0.013 af Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 930.44' @ 12.05 hrs Surf.Area= 704 sf Storage= 185 cf Plug-Flow detention time= 43.5 min calculated for 0.013 af(97% of inflow) Center-of-Mass det. time= 30.9 min ( 809.8 - 778.8 ) 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=0.19 cfs @ 12.05 hrs HW=930.44' (Free Discharge) I1=Culvert (Barrel Controls 0.04 cfs @ 1.76 fps) 2=Culvert (Inlet Controls 0.15 cfs @ 1.47 fps)