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Casper Creek Townhouses <br />2/04/93 <br />Revlsed 6/04/93 <br />BASIN "B" ANALYSIS <br />R/D Analysis & Design <br />I. EXISTi:JG SITE CONDITIONS <br />� <br />rea 4.98 acres <br />CN Value 83.0 <br />Time oi Concentration <br />86-4555 <br />CRO <br />The existing time of concentration travel path of Basin "B" consists of 250' of sheet <br />flow @ 8.5% over forest and 700' of channel @ 1.75%. The time of concentration <br />is computed by the computer program "WaterWorks Version 2" to be 43.20 <br />minutes. <br />DEVELOPED SITE CONDITIONS <br />The discharge point of the detention facility is to the existing stream located along <br />the north half of the eastern property line. The detention facility will be sized based <br />on the existing conditions of Basin "B" which is tributary to this discharge point. <br />a. Detatned Area = 5.79 acres <br />The detained area consists of impervious areas diverted from Basin "A" and <br />Basin "C" as weli as impervious areas in Basin "B". A small portion of <br />pervious area will also enter the proposed detention Tacility. <br />CN Values <br />Impervious Area = 4.18 acres <br />CNimpervious ' 98 <br />Pervious Area = 1.61 acres <br />CNPer�io�e = 8�•60' (lawns/landscaping good condition) <br />Soil <br />Custer Fine Sandy Loam <br />Aldenvood-Urban Land C <br />M`Kenna Gravelly Silty Loam <br />pe;vious — <br />„C„ <br />� <br />Group � CN <br />:. <br />�� <br />Time of Concentratfon <br />The developed time o( concentration consists of 10 lineal feet of sheet fiow <br />over forested wildlife corridor et 2.0 percent, 50 lineal feet of sheet flow over <br />lawns at 24.0 percent and 433 lineal feet of channel fio�v in pipe at 0.50 <br />percent. The time of concentration was calculated by the computer <br />program "WaterWorks" to be 12.39 minutes. <br />