NCC233492_Site Plan or Location Map_20231127

Riverwalk of Hayesville Subdivision Plat Detail
CLAY-2023-011
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! Area draining to Inlet #1 145' x 340' = 49,300 sq ft = 1.132 Acres
Area draining to Inlet #2 39' x 150' = 5,850 sq ft = 0.143 Acres
Area draining to Inlet #3 39' x 210' = 8,190 sq ft = 0.188 Acres
Calculation for Area to Inlet #1
C runoff coefficient using recommended (by Fred Walker) value of 0.6
I intensity in in/hr for 24hr 10 year storm event (from NOAA intensity map ) =5.28
A is drainage area = 1.132 therefore:
Q = C* I* A = 0.6 * 5.25 * 1.132 = 3.56 cfs
Inlet #1 drains into a 12" storm water pipe with max flow 10.5cfs which is sufficient
Inlets #2 & #3 have much smaller drainage area.