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<br />.c, <br /> <br />TASK NO.: 9 <br />RFP CROSS-REFERENCE: <br />Step 3, Item (l) <br /> <br />STAFF MEMBERS RESPONSIBLE: <br />Alternative Identification and <br />Evaluation Specialist <br />System Operation Studies Specialist <br />Hydraulic Design Specialist <br />Preliminary Design and Cost <br />Estimates Specialist <br /> <br />TASK TITLE: <br /> <br />Evaluation of Alternative Surface Creek Projects Only. <br /> <br />RATIONALE: <br /> <br />Evaluations to determine the comparative feasibility of alternative plans for <br />augmenting the water supplies of the Surface Creek system from Surface <br />Creek itself using the GMWCD conditional water rights requires using <br />estimates of the probable degree of success in implementing a basin-wide <br />water management plan in the Surface Creek basin. <br /> <br />METHODOLOGY: <br /> <br />I. Based on discussions with GMWCD personnel, individual senior water rights <br />owners, and the District ,.0 Water Commissioner, estimate the most probable <br />level of participation in a Surface Creek basin water management plan <br />involving exchanges. <br /> <br />2. Using an available reservoir operation computer program, the replacement <br />storage releases determined in Task 3, the gross storable inflows determined <br />in Task ", and appropriate values of reservoir evaporation and seepage losses, <br />determine the required size of the Cactus Park or other selected replacement <br />reservoir under the existing and most probable future scenarios of participa- <br />tion in a management plan by senior water rights owners. <br /> <br />3. Prepare appraisal level designs and cost estimates for replacement reservoirs <br />and feeder canals, if any, of the capacities estimated for the two scenarios <br />evaluated in Step 2 above. <br /> <br />PRODUCTS: <br /> <br />1. Descriptions of alternative project plans using only Surface Creek supplies <br />obtained by means of improved system management and the GMWCD <br />conditional water rights. <br /> <br />2. Tabulation of the comparative costs and feasibility of the alternative project <br />plans. <br /> <br />II-17 <br /> <br />Revised 9/23/1985 <br />