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<br />-0019,28 <br /> <br />. <br /> <br />All releases were discontinued August 30 so repairs to outlet works <br />could be started and possibly completed before winter weather or <br />demands for stock water releases occurred. <br /> <br />During the irrigation season, an inspection of the Medicine Creek <br />channel between Medicine Creek Dam and its mouth was madem determine <br />if project use for conveyance of irrigation releases were creating any <br />erosion problems that would not have occurred without project use. It <br />was concluded that although erosion has occurred, the channel appears <br />to be more stable than at any time since construction of Medicine Creek <br />Dam. Several referenced cross-sections were taken to evaluate erosion <br />progress. <br /> <br />During'October, an investigation was made of the upper end of the <br />reservoir to determine sediment accumulations, and a resurvey is not <br />required at this time. <br /> <br />Harlan County Reservoir <br /> <br />The reservoir inflow for 1963 was 61% of the most probable. The reservoir <br />reached a depth of 1.79 feet (24,890 acre-feet) on February 21, and a <br />depth of 0.44 feet (6,050 acre-feet) on June 24 in the flood control <br />pool. Controlled spills were made during February, March, and early <br />April. Irrigstion demands and special releases in late August and early <br />September resulted in the reservoir being drawn down approximately 8.2 <br />feet (98,790 acre-feet). This drawdown was necessary to inspect and <br />make temporary repairs to the riprap on the upstream face of the dam. <br /> <br />During the irrigation season, a series of current meter measurements were <br />made below the Superior-Courtland Diversion Dam to determine the river <br />gain from return flows of irrigstion diversions. It was found that these <br />return flows snd natural accretions were sdequate to meet the allocated <br />water rights and sanitation requirements below the Superior, Nebraska <br />sewer outlet with no by-pass at the Superior-Courtland Diversion Dam. <br />It was also found that when many of the irrigation pumps were operating <br />simultaneously at a higher rate than their allocated appropriation, the <br />minimum instantaneous flow recorded at Hardy, Nebraska was 38 cfs while <br />the minimum mean daily flow was 41 cfs. Hardy, Nebraska is about 6 miles <br />downstream from Superior, Nebraska. These studies sre to be continued <br />in future years when climatic conditions are favorable. <br /> <br />Lovewell Reservoir <br /> <br />. <br /> <br />Controlled spills were made in January, February and March to maintain <br />the pool elevation at 1578.0 while erosion control structures were being <br />completed in the upper reaches of the reservoir. The reservoir inflow <br />for 1963 was 133% of the most probable. The 14,972 acres of the Kansas- <br />~ostwick Irrigation District below Lovewell were provided a full water <br />supply. During the drawdown of Harlan County reservoir for the inspection <br />and temporary riprap repairs, Lovewell Reservoir reached a depth of <br /> <br />7 <br />