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<br />through the previous time periods. <br /> <br />Column 7: Effective precipitation for the pervious area IS Column 4 <br /> <br /> <br />minus Columns 5 and 6, positive values only. <br /> <br />Column 8: Column 7 times the (decimal) percent of the pervious area <br /> <br /> <br />gives the area-weighted depth of water that will runoff in each time <br /> <br /> <br />increment for the pervious area. <br /> <br />Column 9: Enter the total assumed impervious detention and depression <br /> <br /> <br />storage determined from Table 2-2 of the Criteria Manual at the bottom <br /> <br /> <br />of Column 9. The impervious detention and depression storage In <br /> <br /> <br />Column 9 is then either the amount of precipitation in Column 4 or the <br /> <br /> <br />amount available as determined by deducting the total accumulated amount <br /> <br /> <br />from the total assumed value shown at the bottom of Coluum 9. When the <br /> <br /> <br />total assumed amount is fully used, all remaining values arc zero. <br /> <br />Column 10: After all of the impervious storage have been filled, an <br />impervious loss will still occur, To account for this, Column 10 IS <br />computed by taking 5 percent of Column 4 less Column 9. <br /> <br />Coluum 11: Effective precipitation for the impervious area is Column 4 <br />less Columns 9 and 10. <br /> <br />Column 12: Column 11 times the (decimal) percent of impervious area <br /> <br /> <br />gives the area-weighted depth of water that will runoff in each time <br /> <br /> <br />increment for the pervious area. <br /> <br />-28- <br />