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�� <br />Job Number: 93-419-26 File: F:\��41�oocs�PREa.woi <br />T. Fisher Date: 04-Nov-93 <br />Calculated by: Date: <br />Checked by: <br />Project: Everett Clinic <br />CALULATE THE WEIGHTED SCS CURVE NUMBERS FOR BASIN 'B' <br />AREA Cn• <br />PREDEVELOPED CONDITIONS o 22 86 <br />-grass 0.03 9e <br />-pavement, buildings <br />TOTAL = 0.25 Acres <br />WEIGHTED AVERAGE Cn VALUES: <br />-Predeveloped conditions <br />PERVIOUS IMPERVIOUS <br />66.0 98.0 <br />*Note: Hydrologic soil group'C' was used as the SCS <br />soils map indicates Alderwood (AgC) soils. <br />CALCULATE THE TIME OF CONCENTRATION <br />�a hour�sop�uvia�s: ref. KCSWDM 3.5.1-8 <br />2-year (P2) = 1.55 incheslday So 0.4 <br />Tt=I0.42"(Ns"L)^.8]/I�P2�0.5)*( � )� <br />Sheet flow: Tt = L/[60"Ks`(So ^ 0.5)] <br />Conc. tlow: <br />Predeveloaed conditions so 7t <br />Segmerit Status Length NS KS �,�� (mIn) <br />���� 3.1 % 17.2 <br />g� _ gp lawn 160 0.150 NA <br />(sheet) Total = 17.2 min <br />SUMMARY OF INPUT �ATA FOR KCSWDM'S ITYD PROGRAM <br />Predeveloped: <br />Aper Cn Almp Cn <br />(Ac) (Ac) <br />0.22 86.0 0.03 98.0 <br />Tc P2 <br />(min) i��) <br />� 7, 2 1.55 <br />