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<br />_ From: RO,n Elhesner To: ShIrley Mondy <br /> <br />o <br />C:) <br />~ <br />~..\ ) <br />~ <br />f0 <br /> <br />Date: 01/11/02 1lme: 2:56:42 PM <br /> <br />Pcge7ol1 <br /> <br />The gage flow of the San Juan River at ArchuletalBlanco will be used in place of <br />Navajo Darn releases. This takes Navajo Dam operation out of the model. All <br />gainlloss nodes on main stem of the San Juan below Navajo Dam will be set to <br />zero. <br /> <br />2. The model will then be run on a daily time step for the entire model period (1929 <br />-2000), producing a daily flow record at each main stem gage. <br /> <br />3. The gainslIosses above each main stem gage will be calculated by subtracting the <br />historical daily gage record from the simulated gage record produced by the <br />model run (Actual Gage - Model Gage). This will be a cumulated gain!loss <br />down-river. To compute the gain!loss in each reach, the upstream gain!loss will <br />be subtracted. A daily time series of positive and negative numbers results. This <br />time series is the gainlloss adjustment required to match gage flow. <br /> <br />A gain!loss node is placed in the model above each of the main stem gages_ The time <br />series calculated in step three is placed in the gainlloss node as a flow correction. This <br />assures that the historical model will always reproduce gage flows. This same set of <br />gains and losses will be used in Baseline runs and any run used to evaluate future <br />projects. The only reason for the gainslIosses to change would be due to a correction or <br />modification of the historical model that would effect the generation of the natural flows. <br />In such a case, the process described is repeated. <br /> <br />Gains and losses on the Animas can be done in the same manner. We would recommend <br />that the only gain!loss node required is immediately above the Animas at Fannington <br />gage. <br /> <br />Keller-Bliesner Engineering <br />Draft San Juan Model Input Data Generation <br /> <br />January 11, 2002 <br />Page 6 <br />