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<br /> <br />()03124 <br /> <br />Pueblo and using the frequency of the maximum flood of record on Dry <br /> <br /> <br />Creek and the ratio of the drainage areas todetermlne a peak flow and <br /> <br /> <br />comparable ftequency. The curve then was obtained by paralleling the <br /> <br /> <br />Dry Creek curve. This preli.minary discharge-frequency curve indicates <br /> <br /> <br />that the maximum flood of record 22,000 c.f.s. would have been equaled <br /> <br /> <br />or exceeded once in 23 years and the estimated channel capacity (vicinity <br /> <br /> <br />of U. S. Highway No. <;0 bridge) of <;,000 cubic feet per second equaled <br /> <br /> <br />or exceeded once in 2 years. <br /> <br /> <br />6. Discharge frequency curves for the Arkansas River at Holly, <br /> <br /> <br />. Colorado, Syracuse and Dodge City, Kansas, with ,I ohn I~artin Dam opera- <br /> <br /> <br />ting were lnodifi,ed to show the additional effects of a reservoir on <br /> <br /> <br />Wolf Creek. The estimated hydrographs of flood flows at Wolf Creek Dam <br /> <br /> <br />have been routed to the above named stations to determine the reduction <br /> <br /> <br />in peaks. Peak flows at this frequency were adjusted on the probability <br /> <br /> <br />plot and a modified discharge-frequency curve assumed to go through the <br /> <br /> <br />average of these points; the floods of lower flows were unaffected. <br /> <br />7. Since the reservoir capact ty below the spillway crest exceeds <br /> <br /> <br />. the volume of the estimated standard project flood, all floods at the <br /> <br /> <br />dam site will be reduced to less than the capacity of the uncontrolled <br /> <br /> <br />outlet conduit at this elevation (1.120 c.f.s.). Plate 3 shot,lS the area- <br /> <br /> <br />capacity curve for Wolf Creek Reservoir. Plate 4 shows the conduit dis_ <br /> <br /> <br />charge curve; Plate <; shows the operation hydro graphs of the est:inia:ted~ <br /> <br /> <br />flows during the'1949.flood. <br /> <br /> <br />8. The reservoir capacity at spillway crest is 30;000 acre":feet'., <br /> <br /> <br />1'he required flood control storage is 26,600 acre-feet leaving 3,400 acre- <br /> <br />feet for sediment accumulation., This sediment reserve is far in excess <br /> <br /> <br />of the 900 acre-feet requited for an estimated <;O,rear sediment accumulati.on. <br /> <br />3 <br /> <br />'-,,"- <br /> <br />