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<br />. <br /> <br />. <br /> <br />~ <br /> <br />~o~:, <br /> <br />Hydrology <br /> <br />The results further show that the flows near Crook, Colo., <br />are of lower quality than those at the other testing points <br />including the Julesburg station near the Colorado-Nebraska State <br />line. When the flows at the Crook station are at low stage, they <br />are made up mainly of return flows, and the salinity is high enough <br />to constitute a minor problem; that is, in order to prevent an <br />excess of soluble salts from accumulating in the soil, a moderate <br />amount of soil leaching is required. Historically, this leaching <br />requireIlEnt has been met by means of the unavoidable farm losses. <br /> <br />In the future, with the Narrows Unit in operation, passage of <br />sllrfRce flows through the reservoir and the change in flow pattern of <br />the So.Platte River below the dam can be expected to eliminate the <br />wide !'luctuations in the salinity levels of the streamflows. But <br />the overall quality should not be altered significantly. In future <br />"with" project operations, as in the past, the lowest quality of <br />water is expected to occur at the reach near Crook, but the condition <br />is not expected to be substantially different than it has been <br />historically. With supplemental water available,greater soil leach- <br />ing can be accomplished. Thus, it is unlikely that further saliniza- <br />tion of the soils will take place, and it is possible that a slight <br />improvement could be obtained in the salinity balance that now exists <br />between the water supply and the soil. This opportunity for greater <br />leaching applies to all lands which are served supplemental water. <br /> <br />DOWNSTREAM EFFECTS <br /> <br />As previously discussed in the water rights section of this <br />part, the Narrows Unit would not be affected by the Colorado-Nebraska <br />Compact, since Narrows Dam would be located above Balzac, Colo. The <br />average annual flow at Julesburg, Colo., for the period 1947 through <br />1961 would be reduced from the historic flow of 315,000 acre-feet to <br />229,900 acre-feet with the Narrows Unit in operation. A comparison <br />of monthly flows for historic and "with" project conditions indicates <br />that during high flow periOds, such as the spring of 1958, the "with" <br />project flow would be less than the historic flow, but during low <br />flow periods, such as the summer of 1954, the "with" project flow <br />would be greater than those which occurred historically. <br /> <br />TO <br />