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' <br />� <br />DRAINAGE CALCULATIONS <br />The wet pond will provide treatment for the entire Project (i.e., ell three of the lots). The <br />wet pond was sized to treat the 6-month, 24-hour developed hydrograph. The SBUH <br />method was used to develop a hydrograph for the developed tributary drainage basin using <br />a precipitation of 0.99 inches, which is 64% of the 2-year precipitation. Following is a <br />summary of the on-site and off-site hydrogaphs for the 6-month, 2-year, 10.year, 25-year, <br />and 100-year stonn events: <br />On-Site Area <br />Time of Concentration (T�) On-Site Flow = 14.58 min. <br />TcReach - Shat L: I00.00 ns:0.4000 p2yr: 1.35 s:0.2400 <br />TcReach - Shallow L: 160.00 ks:27.00 a:0.0500 <br />TcReach - Channel L: 685.00 ke:42.00 s:0.0100 <br />evelo ed On-Site Ai <br />Precip. Peak Flow <br />Peak <br />ISTORM DRAINAGE REPORT FOR VIKING FREIGHT/f�RRILL CREEK PAGE 4 <br />