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I Orifice Sizing <br />The orifice was sized through the use of level pool routing using the Water Works <br />Iwmputer program. The_ori6ce was designed to_ detain the 2-year developed stonn event <br />in the pond while allowing the 10-year, 25-ycar, and 100-year storms to overtlow. The <br />Imaximum water surface elevation was set at 509.00 ft. To csiculate the 2-year storm <br />event, the off-site hydrograph was added to the on-site developed hydrogaph then routed <br />Ithrough the pond. The following tabldsummary is per the L.evel Table Summary and <br />Stage Discharge/Storage Tables provided in the Appendix: <br />I <br />I �� <br />u- � <br />ioo- <br />o�sie� � ��r.> � orc�«< �. e�r,� I Total Fbw (cfal'� <br />�` Please note that the total of the flows is not <br />an arithmetic sum of the pealc flows, but the <br />addition oFthe hydrographs. <br />712APEZAIDAL BASIN ID No. S7'ORI <br />Dcscriplion: AC'fUAL LIVE S1'ORAGE <br />Lenglh: 548.00 ft, Width: 52.50 ft. <br />Side Slope l: 2 Sidc Slope 3: 2 <br />Side Slope 2: 2 Side Slope 4: 2 <br />Mi1I.T[PLE ORIFICE ID No. DISI <br />Description: DISCHARGE OEtIF'[CE <br />Outict Elcv.: 505.50 <br />Elev.: 503.50 (t Oritia Diametcr: 4-�/= in. <br />� STORM DRAINAGE REPORT FOR VIKING FREIGHT/I�RRILL CREEK PAGE 6 <br />