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<br />. <br /> <br />. <br /> <br />the Ci'lCB for their review and comment before being finalized. <br /> <br />USE OF HYDROLOGIC MODELS IN THE STUDY <br />In general, three types of hydrologic models may be needed <br />for the study. These include watershed models that would be used <br />to develop design flood hydrographs, allocation models that would <br />be used to allocate available flow according to the dictates of <br />water rights and other rationale as desired, and operational <br />models that would be used to simulate the operation of alterna- <br />tive projects in order to determine the optimum management scheme. <br />There are several models, with slight variations from one <br />another, under each of the above catagories that are currently <br />available for use. Loosely defined these include, but are not <br />limited to, the following: <br />1. Watershed Models <br />SAC: Robert J.C. Burnash, R. Larry Ferral, Richard <br />A. McGuire, "A Generalized Streamflow Simulation <br />System, Conceptual Modeling for Digital Computers", <br />cooperatively developed by the Joint Federal-State <br />River Forecast Center; U.S. Department of Commerce, <br />National Weather Service and State of California, <br />Department of Water Resources, March 1973. <br />SSARR: U.S. Army Corps of Engineers, North Pacific Divi- <br />sion, "Streamflow Synthesis and Reservoir Regula- <br />tion", June 1975 edition. <br />HEC-l: U.s. Army Corps of Engineers, The Hydrologic Engin- <br />eering Center, "Flood Hydrograph Package", January, <br />1973. <br />2. Allocation Models <br />SIMYLD: Texas Water Development Board, Systems Engineering <br />Division, ":economic Optimization & Simulation <br />Techniques for Management of Regional, Water Re- <br />source Systems, River Basin Simulation Model", <br />July, 1972. <br /> <br />I-7 <br />