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<br />4 <br /> <br />. <br /> <br />These ditches can also be controlled to obtain the desired diversion <br />even during low river flows, and adjustments are usually made when an <br />increase occurs during a reservoir release. <br /> <br />The amount of water inadvertently diverted by a particular ditch <br />can readily be determined through analysis of the ditch's diversion <br />record during reservoir releases. Following a brief study of the diver- <br />sion records for 21 ditches along the upper Arkansas River (table 5), <br />14 ditches were selected to be examined in detail during 15 reservoir <br />releases. These releases ranged from about 225 ft3/s to about 500 ft3/s <br />and were made during the years 1965, 1966, 1970, 1971, and 1972. The <br />average reservoir release was about 400 ft3/s. <br /> <br />It is emphasized that data in table 5 are averages of diversions <br />during reservoir releases only. They do not represent the diversion <br />during anyone release, and they do not report average diversions during <br />all types of river conditions. <br /> <br />Analysis of these data consisted of simple graphical techniques and <br />multiple regression using the following variables: <br /> <br />(a) Dependent variables: <br /> <br />(1) Total inadvertent diversion by the 14 ditches, in cubic <br />feet per second, and <br /> <br />- <br /> <br />(2) Inadvertent diversion by a selected ditch, in cubic feet <br />per second. <br /> <br />(b) Independent variables: <br /> <br />(1) Amount of reservoir release, in cubic feet per second, <br /> <br />(2) River flow at Wellsville gage at time of release, in <br />cubic feet per second, <br /> <br />(3) River flow at Wellsville gage at time release arrived at <br />the Wellsville gage, in cubic feet per second, and <br /> <br />(4) River flow at Wellsville gage 6 hours after release <br />arrived at the Wellsville gage, in cubic feet per second. <br /> <br />Results of this analysis indicated the simple relation of total <br />inadvertent diversion to river flow at the Wellsville gage at time of <br />release was well defined and the most useful for administrative purposes. <br />This relationship is shown on fi~ure 7. Figure 7 shows that inadvertent <br />diversions range from 48 to 4 ft Is for antecedent river flows of from <br />350 to 3,200 ft3/s, respectively. Although intuitively one would expect <br />that the amount of the release affects inadvertent diversions, available <br />data were insufficient to adequately define this effect. Inadvertent ~ <br /> <br />20 <br />