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U 1.., :.,j ~ 23 Outflow -Storage Relation Curves Outflow-storage relation curves (fig, 6-118) are presented in this section for 113 gaging stations operated for 6 or mo re years under unregulated con- ditions. The illustrations are in downstream order corresponding to the order of the stations in table 1. Each station is numbered in agreement with table 1, also with the map in figure 1, and with prior reports in this technical series. The curves in each illustration show the storage required to sustain a continu- ous gross outflow or draft rate with chances of deficiency in outflow ranging from 2 to 50 percent, No allowance is made for evaporation or seepage losses. Sustained gross outflow with small chances of deficiency cannot exceed the mean flow of the river which is show n by a horizontal dashed line and the val ue in the left margin. The chance deficiency relations are developed from stream- flow records extended to the base period 1920- 56. Storage requirements are in acre-feet per square mile, and corresponding outflow is in cubic feet per second per square mile. Total drainage area is noted at the bottom of each figure. Outflow-storage relations for the 1952-57 drought are shown by cir- cled points for comparison. Numerals at spaced intervals along the curve of 2-percent chance of deficiency show the effective detention period in years to deplete the indicated storage starting from full reservoir. Each set of curves is based on essentially unregulated flow, Other inves- tigations maydeem it necessary to apply other criteria for identifying unreg- ulatedflow, but for this report it was arbitrarily decided that all years ofrec- ord at all stations could be used in developing the outflow-storage relations except as follow s: (1) For station e, South Fork Republican River near Ben- kelman, the only records used were those obtained prior to closure of Bonny Reservoir. (2) For lower Republican River stations 8, 13, and 14, records ob- tained prior to closure of Harlan County Reservoir in November 1952 were used despite the possible effect of older reservoirs and diversion in the head- waters which has not been evaluated. (3) For stations on Smoky Hill River and Solomon River below Cedar Bluff, Kanopolis, Kirwin, and Webster Reser- voirs, the only records used were those obtained prior to the effect of these reservoirs. The possible effect of these reservoirs and of those in the Repub- lican River basin on the discharge at the mainstem stations along the Kansas River was not evaluated. (4) On the main stem of Arkansas River, the stations near Wichita, at Wichita, and Arkansas City were considered not to have been appreciably affected by nearby regulation or by the operation of John Martin Reservoir. (5) For stations below Fall River Reservoir on Fall River and Verdigris River, records prior to 1949 were the only ones used. Users who may be concerned with present and future opportunities below existing or pro- posed reservoirs should make allowance for the specific existing or proposed regulating procedures.