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JHN-ie-64 Wto d;UJ K W 81t6Kt1U S1KN FAX NO, 2099420214 <br /> 130 <br /> FORMULAS FOR CALC I ATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> BASIC RUNOFF CO£,H41CIENTS <br /> SURFAGOE,F`FICIETTS <br /> POND or BASIN 1.00 <br /> PAVING (concrete, asphalt, oiled surface) 0.95 <br /> BUILDING or ROOF 0.80 <br /> COMPACTED EAR'T'H (gravel.) 0.75 <br /> LAWN or LANDSCAPING 0.20 <br /> SAN JOAQUIN COUN:I'Y <br /> ZON '1�,URAI:.-AREAS <br /> RUNOFF CALCULATED AT 3.36" (0.28 <br /> ( a 10 - year, 24 - hour storm) <br /> ~aRMVL SS <br /> Surface krea (in Sq.Ft.) Coeffl. Runoff in Ft, Cu. Ft. Needed <br /> POND BASIN = � �� x 1.00 x 0.28 -2730 <br /> PAVING x 0.95 x 0.28 S 9 3 I <br /> ROOF = .2 �r '� '_ x 0.80 x 0.28 <br /> COMP. EARTH = __ x 0.75 x 0.28 = <br />_ LAWN & <br /> LANDSCAPE _ �. �:�� x 0.20 x 0.28 = -� <br /> SUBTOTAL <br /> * The needed pond capacity = Subtotal x 2 - 2, 0E.2 CU. FT. <br /> (Volume determined with no allowance for percolation) <br />