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<br />2 <br /> <br />INTRODUCTION <br /> <br />This report is the fifth in a series of studies of Kansas streamflow char- <br />acteristics undertaken as a part of the cooperative programs for water re- <br />sources investigations between State of Kansas agencies and the U. S. Geo- <br />logical Survey. Technical report No. I in the seriesl shows the percent of <br />time that streamflow of a given magnitude can be expected to be equalled or <br />exceeded. The second technicalreport2 shows the frequency at which the <br />annual minimum flow continuing for periods of given length may fall below <br />various rates. The third report3 evaluates the magnitude and frequency of <br />flood discharges. The fourth report4 evaluates the adequacy of various stor- <br />age capacities to sustain the low flow of streams above various rates. This <br />report, the fifth of the series, evaluates the adequacy of storage from an <br />opposite viewpoint by showing the storage capacity needed to limit flood re- <br />leases below various rates. Other analyses are now in process to evaluate <br />that proportion of streamflow which is not derived from storm runoff. <br /> <br />Reliable information is needed in Kansas of the effect of storage on flood <br />remoff, particularly because of increased planning and operational studies of <br />both flood control and multipurpose reservoirs. A reservoir cannot reduce <br />the total volume of flood runoff, but with adequate storage a reservoir can <br />reduce the peak outflow to a safe rate if continued over a longer period. The <br />design of adequate storage reservoirs should be on the basis of factual con- <br />siderations such as the following: (1) From past streamflow experience what <br />is the chance that a given storage capacity wo uld be ins ufficient to limit out- <br />flow to a specified rate? (2) Conversely from past streamflow experience <br />what is the chance that with a specified storage capacity a given outflow rate <br />would be exceeded? (3) To meet a given need will the knowledge of the effect <br />of storage-outflow relationships permit design of a smaller reservoir, per- <br />mit correction of an underdesigned reservoir, or permit allocation of more <br />storage for conservation uses? It is the purpose of this report to define <br />flood storage requirements in Kansas to help governmental agencies and de- <br />sign engineers provide the best solutions for reducing flood damage. <br /> <br />1 Furness, L. W., 1959, Kansas streamflow characteristics, pt. 1, Flo~ dura- <br />tion: Kansas Water Resources Board, Tech. Rept. No.1. <br /> <br />2 <br />Furness, L. <br />frequency: <br /> <br />W., 1960, Kansas streamflow characteristics, pt. 2, Low-flow <br />Kansas Water Resources Board, Tech. Rept. No.2. <br /> <br />3 <br />Ellis, D. W., and Edelen, G. W., Jr., 1960, Kansas streamflow characteris- <br />tics, pt. 3, Flood frequency: Kansas Water Resources Board, Tech. Rept. <br />No.3. <br /> <br />4 Furness, L. W., 1962, Kansas streamflow characteristics, pt. 4, Storage <br />requirements to sustain gross reservoir outflo~: Kansas Water Resources <br />Board, Tech. Rept. No.4. <br />