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<br />piles, roads, and disturbed lands around mine portals, all of which are likely to increase <br />the magnitude of Rational "c" coefficients compared to undisturbed conditions. The <br />higher coefficients are-representative of the basins whose land use may be redefined at a <br />future date and do not have Drainage Master Plans. In addition, although historic stonn <br />peak discharges are supposed to be maintained from developed areas, there is an inherent <br />difficulty in constructing and predicting the impact of upgradient detention facilities on <br />steeply sloped basins on the magnitude of downstream stonn peaks in small mountainous <br />basins. <br /> <br />I <br /> <br />As shown on Table 3, historic stonn peak discharge estimates for Basins B1 through B6 <br />range from approximately 5 to 80 cfs for the 5-year event and from approximately 10 to <br />210 cfs for the 100-year event. Storm peak discharge estimated for design basins are <br />shown in Table 4. <br /> <br />J <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />6 <br />