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Orifice N3 <br />Qsizing = 0.313 CFS <br />Head = 565.10 - 563.02 = 2.09' <br />0.313 = 0.62 a (2)(32.2)(2.08) <br />a = 0.0436 <br />D= 4 t�46 <br />= 0.236 FT = 2.83 IN <br />Use orifice diameter of 2 7/8" <br />Orifice A4 <br />Qsizing = 0.313 CFS <br />Head = 565.10 - 564.02 = 1.08' <br />0.313 = 0.62 a (2)(32.2)(1.08) <br />Ll�. <br />,J. <br />a = 0.061 <br />'w 0' <br />D = 4 0.061 = 0.278 FT = 3.33 IN <br />►► <br />Use orifice diameter of 3 3/8" <br />For purposes of oil/water separation asphalt areas require biofiltration. A grass lined <br />(No asp ds or lvehie is pro ri ed <br />IMM M" <br />in the Edgewater basin after discharge from the detention system. <br />I <br />areas will exist in the Japanese Gulch basin.) <br />Total area of asphalt = 153,900 SF <br />Length of swale required = 200 LF + I LF for each 800 SF of asphalt area over 50,000 SF = 330 LF <br />Size Swale: 25 year storm under developed conditions <br />I25yr = 0.22 cfs release rate <br />Use trapazoidal channel w/ 3:1 side slope <br />From attached Table 11 <br />K _ n Where: Q = 0.22 CFS <br />y8/3 suz n = 0,035 <br />y = 0.45 FT <br />s = 0.02 FT/FT <br />8488.03/1310 <br />