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<br />depend on the suitability of the index station and the consequences of <br />exceeding target flows at the damage center, and would range typically <br />between 25 and 100 percent of the forecasted local flows. <br />Where more than one downstream damage center must be protected on <br />a forecast basis by a reservoir, this entire process is repeated for <br />each damage center, and the smallest current allowable release is <br />adopted. <br /> <br />Section 2.03. Computer-Aided Forecast Procedures <br /> <br />In the index approach just described, reservoir releases are based <br />on runoff that is occurring at an "index" station, and use is not made <br />of precipitation information. Computer-aided forecast procedures <br />currently (1975) available in the United States employ sophisticated <br />precipitation-runoff models that can utilize precipitation forecasts in <br />determining streamflow forecasts. Three computer programs that are <br />used on an operational basis for forecasting streamf10ws are described <br />in references 1, 4,and 11. <br />In order to determine reservoir releases for planning studies where <br />flows throughout the basin are known, or for real-time flood operations <br />where forecasted flows are developed by an external procedure, the pro- <br />cedures employed in computer program HEC-5C, Simulation of Flood Control <br />and Conservation Systems, have been found to be useful. Exhibit 2 of <br />Appendix 1 illustrates the procedure. <br /> <br />2-07 <br />