Laserfiche WebLink
The composite existing runoff coefficient, C � will <br /> exist <br /> be 8820(0.90) + 7615(�.90) + 8765f0.20) + 900f0.2�) <br /> 261U0 <br /> ar 0.64. From the grading/drainage plan for the <br /> z <br /> proposed site (figure 2 in the Appendix we have the � <br /> ., <br /> t� <br /> following tahle of values. m <br /> � � <br /> Runof f -� � <br /> Qroeosed Ground Coyer Qrea1SF Coeff_ N � <br /> Roofs� 3ldewalt:s 9075 0.90 �'+ <br /> �� <br /> Paved ParL:ing 12195 0.9U � <br /> 0 <br /> Landecape, Lawns 3930 0.20 � � <br /> m <br /> Landscaped Side Slopes 900 0.25 � _ <br /> -------- � x <br /> .... <br /> < � <br /> Total 26100 � <br /> The composite developed runoff coefficient� C , will �� <br /> dev �^ <br /> be 9075f0.90) + 12195(0.90) + 39�0(0.20) + 900f0.25) �m <br /> 26100 ��^ <br /> N <br /> Z C� <br /> -�r <br /> . � <br /> or 0.77. <br /> -a <br /> In conclusion we have Lh� followinge � <br /> z <br /> C = 0.64 = <br /> exist � <br /> � <br /> C = �.77 = <br /> dev � <br /> -i <br /> .. <br /> n <br /> m <br /> Step 2 Tir�ie of ConcPntration <br /> From Figure B of the Appendix the flow pat�i of the most <br /> remote tributary area has a length of 210' . The slope <br /> along thls path is approximately 3%. From Figure 1 of <br /> the handout the velocity of flow is about 3 fps ( I have <br /> assumed an existing surface between paved area & grassed <br />