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<br />3. RTIWR: Revise the required STATEMOD input files to include the new base flow points. <br />May require modification to existing Phase II base flow points, <br />4. RTIWR: Execute the Statemod baseflow generator to create the .rim file, Visually check <br />for negative base flow values, and correct these at a level of effort not to exceed 8 hours, <br />If modifications to base flows are required beyond 8 hours, a change order will be <br />requested, <br />5. STATE: Document the base flow network, any additional streamflow gages and associated <br />data filling, and the base flows in a 1-2 page memorandum, RTI will provide written <br />comments prior to the State's finalization of the memo, <br /> <br />Deliverables: <br />1. Tributary areas and weighted precipitation information for each new baseflow node, <br />2. Evaluation of whether new stream gages should be added to model for new baseflow nodes, <br />Addition of stream gages to model if appropriate, <br />3. Revised Statemod input files necessary to generate baseflows. <br />4. Statemod base flow file reflecting new baseflow points. <br />5. A memorandum documenting the revised base flow network, and an assessment of the <br />subsequent baseflows generated from the Phase III network. <br /> <br />Subtask 2.14 Calibration <br /> <br />Objective: Demonstrate that the model can reasonably reproduce historical diversions, gages, and <br />reservoir contents when historical operations are simulated, <br /> <br />Assumption: With the Phase III model, it may be difficult to achieve the level of agreement between <br />simulated and historical parameter values that was observed with the Phase II modeL <br />Although calibration may not be improved by enhancing the model, the additional <br />detail is beneficial for non-calibration reasons. <br /> <br />Calibration effort will focus on two comparisons: <br />· Phase HI historical demand scenario vs. gaged data <br />· Phase HI historical dem<!n.d scenario vs. PhaSell historical demand scenario <br />Adjustments will be made to the model with the objective ofiIDprovirig agreement <br />between the Phase III historical scenario and gaged data. The comparison between <br />Phase III historical output and Phase II historical output provides perspective on how <br />well modeled and observed data can be expected to match: if the Phase III changes do <br />not significantly alter Phase II calibrated results, the Phase HI model is deemed <br />acceptable. When the model has been calibrated, the Phase HI calculated demand <br />scenario will be compared to gaged data and the differences will be documented. <br /> <br />Approach: <br />1. RTIWR: Run the STATEMOD program to generate runs required to evaluate each of the <br />three scenarios required for calibration. <br /> <br />Phase IlIa Scope of Services <br /> <br />1059 <br /> <br />A-21 <br /> <br />June 12, 1996 <br />