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<br />HYDROLOGIC AND HYDRAULIC ANALYSES <br /> <br />t~rO~9qic Analyses <br /> <br />Hydrologic analyses were carried 01.:.t to establi.sh the peak <br />discharge-frequency relationships for floods of selected <br />recurrence intervals for Kiowa Creek which was studied in <br />detail for the community. <br /> <br />The study reach of Kiowa Creek which was studied is <br />ungaged. Discharges were determined using a regional <br />methodology. The U.S. Geological Survey Technical Manual NO.1 <br />dealing with ungaged streams (Reference 1) was used and the <br />findings were compared to the results of the USDA-SCS "CN" <br />method for determining a reasonable degree of confidence. The <br />basin parameters needed to utilize this method. drainage area <br />and basin slope. were measured from U.E. Geological Survey <br />topographic maps at a scale of 1:250,000 with a contour <br />interval of 200 feet (Reference 4). Peak discharges were <br />determined for the 10- and 100-year floods and plotted on log <br />probability paper (Reference 4). A straight line was drawn <br />through these points to get the 50-year discharge, and this <br />line was extrapolated to get the 500-year discharge. Peak <br />discharge-drainage area relationships for Kiowa Creek are shown <br />in Table 1. <br /> <br />Table 1. Summary of Discharges <br /> <br />Flooding Source <br />and Location <br /> <br />Drainage Area <br />ilquare mil~ <br /> <br />Peak Discharges <br />(Cubic Feet Per Second) <br />],~!_::.Y.~L.... 5 0 -_rr~!J) 0 -,Y.L..._~; 0 ~::YE <br /> <br />Kiowa Creek at <br />Interstate 76 <br /> <br />709.2 <br /> <br />14.237 36.000 49.346 96,000 <br /> <br />.-4.-- <br />