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FORMULAS -- FOR CALCULATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> BASIC RIJN•OFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> POND or BASIN 1 . 00 <br /> PAVING (concrete , asphalt, oiled surface ) 0.95 <br /> BUILDING or ROOF 0.80 <br /> COMPACTED EARTH J q'ravel ) . , . . , , , , , , 0,75 <br /> LAWN or LANDSCAPING .. 0.20 <br /> RUNOFF CALCULATED 'AT 3. 12" ( 0.261 ) <br /> ( a 10-yecr , 4_$ - hQur afi-orm ) <br /> FORMULAS <br /> POND BASIN u x 1 . 00 x 0.26 <br /> PAVING a i7, VO x 0. 95 x 0.26 #-4k�Y <br /> ROOF ,3b00 ` x ' . 0. 8 0 x 0.26 a ev Z4 <br /> COMP. EARTH= 'I°oo x 0.75, x 0.26 ■ l�55 <br /> LAWN a x 0.20 x 0.26 4&$ <br /> LANDSCAPE. SUBTOTAL - � <br /> , ° THE NEEDED POND; CAPACITY - SUIMTAL. X 2CLLf <br /> (VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION . ) <br />