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<br />. <br /> <br />4, RTIWR: Execute the StateMod base flow generator to create the .rim file. Vistmlly check for <br />negative base flow values, and correct these at a level of effort not to exceed 8 hours. If modifications <br />to base flows are required beyond 8 hours, a change order will be requested. <br />5. STATE: Document the base flow network, any additional streamflow gages and associated data <br />filling, and the base flows in a 1-2 page memorandum. RTi will provide written comments prior to the <br />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 Base Flows. <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 subsequent <br />Base Flows generated from the Phase III network. <br /> <br />Task 2.14 <br /> <br />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 />. <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. Although <br />calibration may not be improved by enhancing the model, the additional detail is beneficial for non- <br />calibration reasons, <br /> <br />Calibration effort will focus on two comparisons: <br />. Phase III historical demand scenario vs. gaged data <br />. Phase III historical demand scenario vs. Phase II historical demand scenario <br />Adjustments will be made to the model with the objective of improving agreement <br />between the Phase III historical scenario and gaged data. The comparison between Phase III historical <br />output and Phase II historical output provides perspective on how well modeled and observed data can <br />be expected to match: if the Phase III changes do not significantly alter Phase II calibrated results, the <br />Phase III model is deemed acceptable, When the model has been calibrated, the Phase III calculated <br />demand scenario will be compared to gaged data and the differences will be documented. <br /> <br /> <br />Approach: <br />1. RTIWR: Run the StateMod program to generate runs required to evaluate each of the three <br />scenarios required for calibration, <br />2. RTIWR: Prepare big picture plots of diversions, streamflows and reservoir contents for two <br />scenarios (Phase III historic vs. Phase II historic scenario, and Phase III historic vs, gaged) to be <br />presented at the calibration meeting. <br />3. RTIWR: Conduct one informal calibration meeting between RTi and the State to identify areas of <br />potential calibration concern. Document the meeting through a set of informal meeting minutes. This <br /> <br />Phase IIla Scope of Services <br /> <br />1167 <br /> <br />A-17 <br /> <br />Jan31,1997 <br />