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<br />1041 <br /> <br />4. Boyle: Execute the Statemod baseflow generator to create the ,rim file, Note that Statemod <br />will'generate new baseflows at all nodes, rather than subdivide Phase II baseflows in reaches <br />to which a node has been added. <br />5, Boyle: Check for negative baseflows and other implausible conditions. Adjust baseflow <br />distribution factors or diversion time series as necessary within the bounds of sound <br />engineering judgement to achieve plausible baseflow estimates. <br />6. Boyle: Prepare a Task Memorandum 5 to 10 pages in length describing the baseflow <br />network, additional streamflow gages and data filling procedures, and adjustments made to <br />improve baseflow estimates. The State will provide written comments on the draft of the <br />memo within one week of receiving it. Boyle will finalize the memo within two weeks of <br />receiving the State's comments. <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, Adjusted baseflows to reflect elimination of negative base flows, <br />6. A memorandum documenting the revised base flow network, and an assessment of the <br />subsequent baseflows generated from the Phase III network. <br /> <br />Task 3.14 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 />Phase II scenario outputs for the calculated and historical data sets will be available <br />to Boyle, <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 <br />III historical output and Phase II historical output provides perspective on how well <br />modeled and observed data can be expected to match: if the Phase III changes do not <br />significantly alter Phase II calibrated results, the Phase III model is deemed acceptable, <br />When the model has been calibrated, the Phase III calculated demand scenario will be <br />compared to gaged data and the differences will be documented, <br /> <br />Phase lIIa Scope of Services <br /> <br />A-39 <br /> <br />June 12, 1996 <br />