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� sized to release '/, of the allowable release rate. The 12-inch standpipe also acts as an <br /> overflow riser for the 100-year storm event. The release rates are as follows: <br /> Storm Event Release Rate <br /> CFS <br /> 2-Year 0.08 <br /> 5-Year 0.16 <br /> 10-Year �•ZZ <br /> 25-Year 0.31 <br /> 100-Year N/A <br /> Pond InOow (Develoned Conditionsl <br /> Please refer to the Developed Conditions Map located in the Appendix. <br /> There is approximately l 1.90 AC of area tributary to the wet pond/detention pond. There <br /> is approximately 9.96 acres of impervious area modeled with a CN-value of 98 and <br /> approximately 1.94 acres of 1lndscaping modelcJ with a CN-value of 86. The curve <br /> numbers are based on the Curve Number Tabla located in the Appendix. The drainage <br /> basin cliaracteristics used to generate the inflow hydrographs are listed below: <br /> BASEFLOWS: 0.00 cfs <br /> TOTAL AREA: I 1.90 Acres TIME INTERVAL: 10.00 min <br /> RpINFALL TYPE: Type IA pgSTRACT. COEFF: 0.20 <br /> TIME OF CONC: 16.30 min IMpERVIOUS AREA <br /> PERVIOUS AREA � 94 Acres AREA: 9.96 Acres <br /> AREA: 86.00 CN: 98.00 <br /> CN: <br /> T�Reach - Sheet Flow: L: 140 feet n,: 0.1500 p2yr:I.55 s: 0.1890 ft/ft <br /> T�Reach - CI an el Flowl�`�� L� 1325 feet k�: 21•�� s�. 0.0179 fl/fl <br /> HYDROGRAPH SUMMARY <br /> Storm Precip. Peak Flow Volume Tim nonPeak <br /> �❑ `CPS Ac-ft <br /> 480 <br /> 2-Year f.55 2.86 1.54 480 <br /> 5-Year 1.93 3.71 1.82 480 <br /> ]0-Year 2.23 4.39 2 20 480 <br /> 25-Year 2.63 6.63 2.76 480 <br /> 100-Year 321 <br /> STORn7 DRF.INAGE REPOItT FOI2INTRAWEST-SEA�VAI' - PAGE 4 <br />