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Seattle,Washington <br /> ti A A II/ T 206.5www.pa22.9510dand.com <br /> TURNING VISIONS INTO REALITY <br /> Table 5 — Existing Flow Control Structure Information <br /> Rim IE (in/out) Riser Size Top of Riser Bottom <br /> Orifice <br /> 522.39' 510.3'/ 18" 517.3' 4.07" <br /> 510.2' <br /> Table 6 — Existing Detention Pipe Information <br /> Pipe# Pipe Diameter(FT) Pipe Area(full) Pipe Length (FT) Calculated Volume <br /> (CU. FT.) <br /> 1 3 7 337 2,385 <br /> 2 6 28 192 5,430 <br /> I <br /> 3 4.5 <br /> 16 319 5,066 <br /> i4 5.5 24 259 6,152 <br /> 5 7 38 88 3,397 <br /> Total 22,429 <br /> Equivalent 6' pipe 793 <br /> Assume only 90% capacity 714 <br /> The above information was used to calculate the estimated runoff from the site to compare <br /> developed vs. redeveloped flow rates to confirm that the redevelopment does not result in <br /> I an increase of 0.1 cfs during the 100 year storm event. The results of the calculations are <br /> presented in items B and C above, in this Section. <br /> INo additional flow control measures are proposed on the site. <br /> I <br /> I <br /> Everett Mall Plaza Parcel III Retail Expansion Stormwater Site Plan Page 21— <br />