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SOUNDVIEW TECHNOLOGY CENTER EVERETT, WA <br /> This equation results in a surface area of 7,857 SF. The pond was designed with a surface area of 2,000 SF at <br /> the top of the sediment storage, which exceeds the minimum requirements for the 10-year flow. The required <br /> area of the orifice was calculated using the following equation: <br /> Ao =AS(2h)05/0.6 x 3600Tgo.5 <br /> =7857x(2(3.5))05/[0.6x3600x24x32.215] <br /> = 0.0748 sf <br /> Converted to the required diameter using the following calculation: <br /> D = 73.54 x Aoo.s <br /> = 73.54 x 0.07480.5 <br /> = 7.64" z 1-5/8" <br /> The sediment pond will have a 3.5'minimum depth from top of riser to bottom of live pond along with 1'of <br /> free board and 1.5'of sediment storage for a total depth of 6.0'. <br /> SEPTEMBER 23, 2022 STORMWATER DRAINAGE REPORT PAGE 42 <br />