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<br />September 12, 1956 <br /> <br />!'YE>TOltANDUJ\.,. <br /> <br />TO: R. M. Gildersleeve <br /> <br />(;:) <br /> <br />F](O:,: J. E. Flack <br /> <br />N <br />~ <br />.... <br />N <br /> <br />SUBJECT: A Study of I(eturn Flow Benefits of John Martin <br />Reservoir, Arkansas River--Caddoa to State Line. <br /> <br />Jin evaluation of return flovl benefits to the <br /> <br />Arkansas River between Caddoa and the Colorado-Kansas <br /> <br />state line because of the river regulation since <br /> <br />John T!iartinReservoir began storing water was attempted <br /> <br />in this studY. Ilecords of diversions of irrigation water <br />from the Arkansas River to lands bordering this reach <br />of the river, along with changes in storage of <br /> <br />tributary reservoirs in this area, ,vere compared with <br /> <br />the accretions to the river in this same reach. <br /> <br />',Vlnter accretions, November through March, were <br /> <br />used as an indication of the return flow in any <br /> <br />particular year because it was assumed that very little <br /> <br /> <br />local storm inflow below the John :Tartin li'eservoir would <br /> <br />occur during this season. Significant months of <br /> <br />diversion which were presumed to directly influence the <br />winter accretions were July through January of the <br /> <br />previous summer and fall and April through October of <br /> <br />the previous summer. These two periodS of diversion <br /> <br />were used in this study. <br />Evaluation of irrigation diversions to lands <br />adjacent to the study reach of the river was made <br />utilizing records available in this office. Records <br />