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<br />developed using estimates of probable maximum thunderstorm <br />precipitation based on thunderstorm records. Precipitation- <br />frequency curves were used to develop the 100-year and 500-year <br />storms and loss ra,tes were established by hydrologists familiar <br />with the area. <br /> <br />The discharges for the 50-year and 500-year floods developed in <br />these on-going studies are less than those listed in the previous <br />FIS (5). The 100'-year flow computed in the Nay 1988 study (9) <br />plus the base channel flow of 60 cfs 1117ill be used. A comparison <br />of the previously accepted flows and those to. be used in these <br />on-going studies follows. <br /> <br />10'-vr _ 50-yr <br /> <br />100-vr <br /> <br />500-yr <br /> <br />19 82 l~IS <br />On-going FIS <br /> <br />160 <br />290 <br /> <br />430 <br />360 <br /> <br />670 <br />385 <br /> <br />1850 <br />435 <br /> <br />r <br /> <br />i.. <br /> <br />-15'. <br />