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~ TASK NO.: 6 RFP CROSS-REFERENCE: Step 2, Item {2} STAFF MEMBERS RESPONSIBLE: Hydrologist System Operation Studies Specialist qam Evaluation Specialist .. TASK TITLE; Estimate of E"cess Water Supplies in the Overland Ditch and Reservoir System Available for Transbasin Diversion. RATIONALE: To estimate the gross inflows available for diversion by the Overland Ditch and Reservoir system and the resulting water supplies excess to the demands' of the sys'tem and potentiaJly available for transbasin diversion to' the Surface Creek basin a computer simulation of the hydrologic operation of the system must be conducted. METHODOLOGY: 1. Evaluate the results of. Task No. 5 to determine whether excess water supplies are available under existing operation of the OyerIand Ditch and Reservoir system and/or whether additional water could be made available through. improved management, if opportunities for such were identified, for diversion to the Surface Creek basin. 2. Review the physical storage restrictions presently imposed on Overland Dam by the State Engineer and the status of proposed reconstruction or replace- ment of the dam on the basis of information obtained in Sub-Task No. 5.6. 3. Determine the r110st probable future plan for Overland barn, viz. its operating capacity and location. 4. Prepare a compllter simulation model of the Hubbard Creek and Muddy Creek basins and operate for the 15-year study period on a monthly basis" under the proposed future operating conditions to determine the gross water supplies available to the Overland Ditch and Reservoir ~ystem. 5.. Combine and evaluate the results of Steps I and ,4 above with regard to supplies required for utilization in the Overland Ditch system under the selected level of improved management identified in Task No.5 to estimate the g~oss water supplies available for diversion to the Surface Cre~k basin. ' Il-14 /