Inflow Area = 70,567 sf, 24.69% Impervious, Inflow Depth = 0.79" for 2 YR-C event Inflow = 1.33 cfs @ 12.11 hrs, Volume = 4,651 cf Outflow = 0.14 cfs @ 12.90 hrs, Volume = 3,145 cf, Atten = 89%, Lag = 47.9 min Primary = 0.14 cfs @ 12.90 hrs, Volume = 3,145 cf Routed to Pond 2P : Subsurface Infiltration Basin 1

Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 91.88' @ 12.90 hrs Surf.Area= 1,500 sf Storage= 2,824 cf Plug-Flow detention time= 338.4 min calculated for 3,144 cf (68% of inflow) Center-of-Mass det. time= 229.2 min ( 987.2 - 758.0 )

#1 90.00' 8,250 cf Custom Stage Data (Prismatic) Listed below (Recalc)

Elevation (feet) Surf. Area (sq-ft) Inc. Store (cubic-feet) Cum. Store (cubic-feet)

90.00 1,500 0 0

95.50 1,500 8,250 8,250

Device Routing Invert Outlet Devices

#1 Device 3 91.00' 2.5" Vert. Orifice C = 0.600 Limited to weir flow at low heads

#2 Device 3 95.00' 48.0" x 48.0" Horiz. Grate C = 0.600 Limited to weir flow at low heads

#3 Primary 87.48' 12.0" Round Culvert\n L = 28.0' RCP, groove end projecting, Ke = 0.200\nInlet / Outlet Invert= 87.48' / 87.00' S = 0.0171 /'' Cc = 0.900\n n = 0.012 Concrete pipe, finished, Flow Area= 0.79 sf

Primary OutFlow Max=0.14 cfs @ 12.90 hrs HW=91.88' TW=87.00' (Dynamic Tailwater) 3=Culvert (Passes 0.14 cfs of 8.90 cfs potential flow) 1=Orifice (Orifice Controls 0.14 cfs @ 4.25 fps) 2=Grate ( Controls 0.00 cfs)