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<br /> 100 100,000 2.50 <br /> EXAMPLE <br /> BO BO,OOO 2.40 <br /> Determine 10- and 50- year flood <br /> 60 60,000 discharges (QIO ,Q50) 0100- 2,30 <br /> A= 10.0 sq. mi. 2,20 <br /> Impervious orea, 1,= 30 percent <br /> 40 40,000 K= 1.00i" 0.015 I 2,10 <br /> :1.00+-0.45=1.45 <br /> 30 30,000 010= 7800cfs 050 -----:::- 2.00 <br /> 0 Q50= 1I,400cfs -- 1.90 <br /> z --- <br /> '" 0 S\e'P.J>----- g <br /> "' u <br /> 20 "' 20,000 <br /> :! '" -- I,BO .... <br /> '" 0: -- Z <br /> --- "' <br /> "' w -- U <br /> 0: .. <br /> -- ii: <br /> :!l .... -- 1.70 <br /> "' "' -- ... <br /> 0 z "' -- - 025- w <br /> '" u-__- 0 <br /> ...l U <br />I " _--u 1,60 <br />.f> ~ 10 --- -::"__iii 10.000 '" <br />'" .... '" <br />OJ -- ~- --- w <br />, '" 0 -<<.. -------- z <br />B > BODO <br /> "' " ---___Stepl 1.50 '" <br /> 0: .. ~ --- ::> <br /> '" ---- ---- 0 <br /> 0 -- ---- :;: <br /> w ..; <br /> '" 6 6000 --- 0: <br /> '" '" -- 1.40 "' <br /> " 0: --- .. <br /> '" '" ::! <br /> :E: -- <br /> 0: U - - -..!tepc <br /> 0 '" <br /> 4 5 4000 <br /> -- 1.30 <br /> - <br /> -- <br /> -- <br /> 3 3000 --- <br /> o -- <br /> 10~ 1.20 <br /> 2 2000 <br /> 1.10 <br /> <br /> <br />1000 <br /> <br />1.00 <br /> <br />Square miles )( 2.59 <br />"'square kilometers <br /> <br />Cubic feet per second x 0.028 <br />"cubic meters per second <br /> <br />'. <br /> <br />FIGURE S.-Nomograph showing the relation between flood frequency, drainage area,and 0 coefficient of imperviousness <br />