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<br />r. <br /> <br />" <br />,I <br /> <br />AVERAGE NUMBER OF FLOWS IN A 10-YEAR PERIOD <br />20 10 5 2 <br /> <br />300 <br /> <br />. <br /> <br />Percentage of area sewered- <br />percentage im pervious <br /> <br /> <br />I <br />1 <br /> Cl <br /> :z <br /> 0 <br /> u <br /> UJ <br /> VI <br /> . <br /> UJ <br /> UJ <br /> LI.- <br />I u <br />" cc <br />:::> <br /> u <br /> :z <br /> <br />250 <br /> <br />200 <br /> <br />150 <br /> <br /> - a. <br /> UJ <br /> ~ '1.e <br /> "" 100 <;\\ <br /> <I: ~'(l'3- <br /> :J: '\)<;\'> <br />I' U <br />., VI <br />" <br /> Cl <br /> 50 <br /> <br /> <br />o <br />0,2 <br /> <br />0.5 <br /> <br />1.0 <br /> <br />2 2,3 <br /> <br />5 <br /> <br />10 <br /> <br />RECURRENCE INTERVAL, IN YEARS <br /> <br />eigUre 5.-Flood-frequency curves for a l-square-mile basin in various states of urbanization. <br />figures 2 and 4.) <br /> <br />(Derived from <br /> <br />9 <br />