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li � . I � .�. � <br /> C . 1C� <br /> e '� ��f�' � <br /> Wa14:en/koti �i �, G <br /> 2313 N. 172nd Street S%/� �, r � � <br /> � Seattle, WA 98133 „ - <br /> (206) 365-9435 ����i/" `�� � <br /> � ��I � � <br /> DRAINAGE PLAN SUBMISSI;`N CALCULATION5 <br /> FOF THE' INTERSECTIONEOFYCASINOcANDNHARDESON�ROADSNT <br /> 0 <br /> � <br /> .. <br /> � <br /> m <br /> INTFODUCTIONe <br /> .,., <br /> � � <br /> These calculations are to accompany the attached DRAINAGE PLAN N� <br /> SUB[,'IISSION �OR�'I• They have been prepared in accordendedWtoh the �' <br /> atep by step description of the Y & W method as app <br /> cQ <br /> above mentioned submission farm. �?5 <br /> o� <br /> �i= <br /> m <br /> � <br /> .+ <br /> c z <br /> c <br /> Step 1. Runoff Coefficient � -� <br /> x <br /> The p��operty currently contains three duplexes. The two �� <br /> � � southerly duple>:es are to be removed. Attached as �i� <br /> figure 1 is a 1=20' aerial photo 04 the site indicating m N <br /> the er.isting ground cover an d associated areas for use �N <br /> in calculating the "area weighted" existing runoff �� <br /> ' s <br /> coefficient. The terrain has a slope of abaut 3% and Ss � <br /> x <br /> classified as rolling p <br /> er Tahle 1 of the handaut. _ <br /> � <br /> Funoff = <br /> ., <br /> Area SF Coef f_ �^ <br /> Er.isting Ground Cov_er i-- _ <br /> 0 <br /> 8820 0.90 '"� <br /> Roof s '' <br /> n <br /> Paved Par4;ing <br /> 7615 0.90 <br /> Lawns�Landscape <br /> 8765 u.20 <br /> Landscape Side S'.opes <br /> 900 0.^<5 <br /> Total 26100 <br /> 1 <br />