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FORMUI_� FOR CAI_CUI_ f-�FION OF A <br /> STORM DRAIN PONDS VOLUME <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> POND or BASIN 1 . 00 <br /> PAVING (concrete , asphalt, oiled surface ) 0.9115 <br /> BUILDING or ROOF _ 0.80 <br /> COMPACTED EARTH ( gravel ) . . . . . . . . . . 0.75 <br /> LAWN or LANDSCAPING 0.20 <br /> RUNOFF CALCULATED AT 3. 12' ( 0.26 <br /> ( a 10- year , 48 - hour storm <br /> FORMULAS <br /> POND BASIN = /9000 x 1 . 00 x 0.26 <br /> PAVING = io x 0. 95 x 0.?_6 = t4z7 <br /> ROOF x 0. 80 x 0.26 = zoo <br /> COMP. EART0.75 x 0.26 6307 <br /> LAWN a = is'687 x 0.20 x 0.26 Sis� <br /> LANDSCAPE <br /> THE NEEDED POND CAPACITY = TOTAL OF ABOVE _ ���O1cu.4 \� <br /> -- — <br /> yQL,I [v1-�pTER ��r1�H' ED A �,p�NANc F FOR PERCOLATION . <br /> ✓i2 co <br /> ✓`/-?��00.5�'� �.J���CQS t- QrJirL�ft.�' J I <br />