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FROM POWER OPERATING 5. 12. 1989 8: ;8 P. 12 <br /> FORMULgS FOR CALCULA�"ION OF A <br /> STORM DRAIN PONYS VOLUME <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICJENT <br /> POND or BASIN 1. 00 <br /> PAVING (concrete , aspholt, oiled surface ) 0.98 <br /> BUILDING or ROOF . . . . . . . . . . . . . . . 0.80 <br /> COMPACTED EARTH ( gravel ) . . . . . . . . . . 0.78 <br /> LAWN or LANDSCAPING 0.20 <br /> RUNOFF CALCULATED AT 3.12 ( 0.26 ' <br /> ( a 10-year , 46- hour storm ) <br /> FORMULAS <br /> '0.• <br /> 11+ <br /> bJ�F bPbr 4 � tQ� qJ�� 6J�• <br /> POND 13ASIN m x 1 . 00 x 0.26 <br /> PAVING a Z: 6 I^ x 0. 95 x 0.26 It <br /> ROOF * x 0. 80 x 0.26 ■ <br /> COMP. EARTH■ x 0.75 x 0.26 • <br /> LAWN & a x 0.20 x 0.26 a <br /> LANDSCAPE <br /> SUBTOTAL <br /> * THE NEEDED POND CAPACITY • SUUTOTAL X Z • 4 J?,4 Cd 6,11E j, P <br /> VOLUME DETERMINCD WITH NO ALLOWANCE FOR PERCOLATION. ) <br />