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<br />I <br /> <br />I <br /> <br />I <br /> <br />A. <br /> <br />I <br /> <br />Section 2: Formulation of Alternative Plans <br /> <br />Planning Assumptions <br /> <br />The following assumptions were lTIade when formulating alternative plans for the <br />present study: <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />1. <br /> <br />A full water supply (under varying degrees of firmness) would be <br />provided to the existing net irrigated area of 14,255 acres within the <br />study area. No new areas which have never been under irrigation were <br />included in the alternative plans. <br /> <br />2. <br /> <br />Water demands for project operation studies and project sizing were <br />based on the minimum water requirements approach as opposed to the <br />use of historical diversions. The minimum water requirements approach <br />utilizes a calculated diversion requirement incorporating the crop <br />irrigation requirement, irrigation efficiencies and irrigated areas as <br />described in Chapter III. <br /> <br />3. <br /> <br />Use of return flows in the study area would be optimized by allowing <br />upper basin irrigators first use of available runoff and upper basin <br />storage. Upper basin return flows would then be used to meet a portion <br />of lower basin diversion requirements. <br /> <br />4. Adequate reservoir storage capacity would be provided to offset <br />shortages which might occur in the lower basin due to changes in <br />operation of the upper basin. Storage capacities would be estimated for <br />varying degrees of firmness of supply. <br /> <br />B. Plan Formulation Rationale <br /> <br />The rationale for formulating alternative plans in this study was based on <br />alternative sources of water supply. Plans were developed using three different <br /> <br />I <br />I <br />I <br /> <br />V-2 <br />