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Show Final Report Hydrologic Model Analysis of the Provo River Basin 2. Operational decisions are made on the river system based upon hydrological or institutional variables that are not included within PROSIM. In the first case, if an operating rule is not included in PROSIM, the model cannot replicate the influences of that rule. The second case is somewhat more complicated. If a reservoir operator follows a certain policy at most times, but changes his operations during certain critical conditions, PROSIM will not accurately simulate those conditions unless the alternate operating policy is included in the model. Also, the decision variable that triggers the switch from one policy to another must be included in PROSIM. Frequently the critical condition trigger may include runoff or demand forecasts which are not currently included in PROSIM. Future simulations are ordinarily made assuming constant operating policies, in order to test those policies. Where operations depend upon changing operational policies, or data outside of the model, PROSIM will not be capable of accurately simulating those operations until those changes and outside data are included. PROSIM was specifically designed to be flexible. Therefore, adding new capabilities or parameters is generally quite straight- forward. January 1998 Page 24 |