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Casper Creek Townhouses <br />2/oa/s3 <br />Revised 6/04/93 <br />BASIN "B" ANALYSIS <br />R/D Analysis & Design <br />II. DEVELOPED SITE CONDITIONS <br />b. Bypass Area = 1.20 acres <br />88-4555 <br />CRO <br />A portion of the pervious area currently located in existing Basin "B" will <br />bypass the proposed detention facility (see Developed 8asin Map). <br />CN Value <br />Impervious Area = 0.45 <br />CNimpervious - 98 <br />(Rooftops - Buidlings 11-15) <br />Pervious Area = 0.75 acres <br />CNPervious - 87.60 <br />Time oi Concentratton <br />The developed time of concentration travel path of the bypass area consists <br />of 90 lineal feet of sheet flow over undeveloped area at 15.50 percent, 350 <br />feet of channel in undeveloped wetland area at 3.0 percent, 319 lineal feet <br />of channel flow in concrete pipe at 0.5 percent and 200 lineal feet of <br />channel flow in undeveloped wetland area at 0.5 percent. The time of <br />concentration was calculated within the computer program "WaterWorks <br />Version 2" to be 29.89 minutes. <br />