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<br />[, <br />'I <br />:1 <br />"I <br />,) <br />"I <br />l <br />I <br />'I <br />"' <br />" <br />ii, ' <br />'3 <br /> <br />j <br />i <br />I <br /> <br />j <br />1 <br /> <br />J <br /> <br />"t <br />.' <br />~1 <br /> <br />w -, <br /> <br />Memorandum <br />November 22, 1978 <br />Page 5 <br /> <br />Calculations for extending the Nontrose Arroyo <br />frequency-discharge curve to determine a I)-year frequency <br />discharge: <br /> <br />For 200 cfs <br /> <br />P(R) = 0.135 <br />P(S) = 0.115 <br /> <br />P(RUS) = P(R) + P(S) - P(R) P(S) <br /> <br />= 0.135 + 0.115 .- (0.135) (0,,115) <br /> <br />= 0.250 - 0.015 <br /> <br />= 0.235 (Recurrence interval = 4.3 years) <br /> <br />For 250 cfs <br /> <br />P(R) = 0.105 <br />P(S) = 0.047 <br /> <br />P(RUS) = 0.105 + 0.047 .. (O.lOS) (0.047) <br />= 0.152 - 0.005 <br /> <br />= 0.147 (Recurrence interval = 6.8 years) <br />