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Casper Creek Townhouses <br />2/04/a3 <br />BASIN "A" ANAL.YSIS <br />100-year/24-hour Design Storm <br />EXISTING SITE CONDITIONS <br />Area 1.30 acres <br />C Value 83.0 <br />T(me of Concentration <br />88•4555 <br />CRO <br />The existing time of concentration travel path of easin "A" consists of 300 feet of <br />sheet fiow over forest at 6.0 percent, 40 feet of shallow flow over forest at 5.0 <br />percent and 50 feet of channel ilow in roadside ditch at 9.0 percent. The time of <br />concentration was calculated within tfie computer program "WaterWorks Versien <br />2" to be 46.85 minutes. <br />II. DEVELOPED SITE CONDITIONS <br />� 0.38 acres <br />CN Values <br />Impervious Area = 0.08 acres <br />CNimperviou� 98 <br />Pervious Area = 0.30 acres <br />CNpervious— 87�60 <br />Time of Concentration <br />A practical minimum time of concentration of 5.0 minutes will be used as the <br />developed time of concentration for Basin "A". This is a conservative assumption. <br />