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<br /> DRAINAGE AREA, IN SQUARE KILOMETERS <br /> .3 10 100 200 <br /> 100,000 <br /> Q50 = The peak discharge far a 2000 <br /> 50-year recurrence interval <br /> I = Effect ive impervious caver <br /> in percen t 1000 <br /> Cl Cl <br /> Z <br /> Z 0 <br /> 0 u <br /> u '" <br /> '" 10,000 Vl <br /> Vl <br /> a: a: <br /> '" <br /> '" Q. <br /> Q. ~, <br /> .... "e Vl <br /> '" e' a: <br /> '" <br /> '" ,<I .... <br /> u. <br /> <,.~ 100 '" <br />I ~ ::E <br />-I> 0,,0' <br />en m ~ <br />=> <br />, u ...o~ m <br /> => <br /> ~ ,:," u <br /> ..; ~o ~ <br /> C> ..; <br /> a: 1000 C> <br /> <( a: <br /> :I: <( <br /> U :I: <br /> Vl U <br /> Cl Vl <br /> Cl <br /> 10 <br /> <br /> <br /> <br />100 <br />0.1 <br /> <br />ID 10 <br />DRAINAGE AREA, IN SQUARE MILES <br /> <br />3 <br />100 <br /> <br />FIGURE 9.-Comparison showing the effects of urbanization on the 50-year peak discharges in Dallas and Houston <br />