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<br />. <br /> <br />23. Floods of Designated Frequency. The 10, 50, 100 and SOD-year peak <br /> <br />flo"s are required for the flood insurance study. They "ere obtained bv <br /> <br />using the D.S.C.S. regression equations. Equations for computing the <br /> <br />peak flows as developed for the Plains Region of Colorado "ere used and are as <br /> <br />follOl's: <br /> <br />QIO = 1l<4AO.S28SB 0.336 <br />QSO = 891A 0 .482Sg 0.lS4 <br />QIOO = l770AO.463SBO,086 <br />QSOO = S 770A 0,432 <br /> <br />,\,'here QlO is the 10-year peak flow, QSO is the SO-year peak flo", QlOO is <br /> <br /> <br />the lOO-year peak flm,. QSOO is the SOO-year flo" in c. f. s., A is the <br /> <br />drainage area in square miles. and SB is the basin slope in feet per mile, <br /> <br />Frequency curves were then obtained by plotting the peak flows on log- <br /> <br />probability paper and drawing a curve through the points. <br /> <br />j <br /> <br />24. Frequency curves for the areas in the study are shown' on plates 8 <br /> <br />through 21. <br /> <br />2S. Summary. Table 1 lists peak discharge figures for the concentration <br /> <br />points show on plates 3 through 7, <br /> <br />.? <br /> <br />6 <br />