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STORM DRA1N STORAGE REQUIREMENTS <br />A = � aG » <br />Ce = .D5 <br />Cd = .(?� <br />L =7�� <br />s = 33 <br />vr = ,q�i- � 'FT�-�y <br />T� _ �� �nla <br />I�p— e 1`�i� t!1 �j1�� . <br />Qe = e`�z� c�. <br />QQ = .d13 <br />T ' \/��.�Mla <br />�5 = ���.� <br />�t - 41�Z�(�c� <br />Area of Basin <br />Existing coefficient of.imperviousness of Basin <br />ground ' <br />Developed coefficient of imperviousness of Basin <br />as planned • <br />Length (maximum of overland tr�vel) <br />Slope (average from Basin�high point to low <br />..point on watercourse) � <br />Runoff rate . � <br />Time of concentration�from formula: <br />10+(L�Vr(60)=T� =3%.`�. <br />Rainfall intensity from rainfall curve : <br />Existing outflow.from�si� v�ing equation: <br />CeI��A = Qe . y� Cr�. Z�� . <br />Maximum outflow permitted.per acre imperviousness <br />from formula: ' <br />qa=Ad � ��> =,073 <br />Storage time (to capacity) from formula: <br />T" S- zs -�- z-r� _ 167.s <br />. •p� <br />Required volume of storage per acre in Basin <br />from equation: <br />�Z _ 437SfClL7,�� _ �O ��,,13�(,�ll�i,> <br />IG�,�tZS <br />Required volume of storage for this Basin from <br />equation: AP('EN�IX 7 <br />yT = ysp�� I oF 2 <br />= 3z71.i ���•G3�. t-%�, ��� �1���� <br />T ,� <br />---� -- <br />�i <br />-%---- <br />_ „� _,_ <br />�v� �� _ �4�r . <br />��i� :'�- �oU�T-ED= <br />44,� < --• <br />LG��--.� �A N� ��� <br />5 <br />�" � �(>i Cs�(o :. Ol! <br />