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-4 <br /> SECTION III - METHODS <br /> 3.1 General <br /> One of the early goals of this study is to develop a standard method for <br /> quantifying alternative operational strategies in terms of risk, water <br /> supply, flood control, and power generation. The elements of this method <br /> will include: hydrology data, depletion data, a detailed river basin model <br /> (CRSS), a method of applying the hydrology and depletion data with the <br /> model, and a common list of parameters to be used in the evaluation of each <br /> strategy. <br /> 3.2 Hydrology Data <br /> The CRSS natural flow and salt hydrology data base will be used. The period <br /> of record to be used will be from water year 1906 through water year 1983. <br /> This data base represents the most thorough analysis made of historical <br /> depletions, the effects of reservoir regulation, and other developmental <br /> impacts on runoff and salt loading in the Colorado River Basin. <br /> Documentation of the assumptions, methods, and data employed in constructing <br /> this data base is available. <br /> 3.3 Depletion Data <br /> There are three depletion schedules that have been developed by the Basin 411 States for use by the Colorado River Basin Salinity Control Forum. Those <br /> schedules are based on a low, moderate, and high rate of development. <br /> Reclamation will use the States' schedules and its own data to arrive at two <br /> levels of depletions, a low level and a higher level, for use in this study. <br /> 3.4 River Basin Model <br /> The CRSM (Colorado River Simulation Model) will be used to simulate the <br /> alternative operational strategies and estimate the impacts of each stra- <br /> tegy. The CRSM is the central feature of the CRSS. CRSS is Reclamation's <br /> official tool for addressing the many "what if" questions that surface in <br /> the management of the Colorado River. Documentation of CRSM in the form of <br /> a user's manual and a programmer's manual is available. <br /> 3.5 Method of Applying the Data and Model <br /> The period of study for each strategy simulation will be from January 1985 <br /> through December 2000. The initial reservoir storage levels will be those <br /> projected for January 1 , 1985. A number of hydrologic sequencies from the <br /> CRSS natural flow data base around selected probability levels will be <br />