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<br />OOHi~7 <br /> <br />3.7 Performing a Study Using the CRSS <br /> <br />A CRSS study basically consists of running the Colorado River Simulation <br />Model a number of times, while varying the demand input data, control <br />data, hydrology input data, or combination of these. Anyone CRSM run <br />consists of using one set of control data, one demand schedule, and one <br />set of hydrology data. <br /> <br />The effects of different demands or levels of developments on the river <br />can be stud i ed by varyi ng the demand input data. Scenari os with no <br />water qual i ty improvement projects can be compared with scenarios con- <br />taining water quality improvement projects, also by varying the demand <br />input data. <br /> <br />The control data file can be modified to study the effects of varying <br />parameters like maximum and mi nimum reservoi r rel eases, generator effi- <br />ciency' flood control space building volumes, initial reservoir con- <br />ditions, bank storage coefficients, shortage and surplus distributions, <br />and surplus strategy assurance levels. <br /> <br />The effects of different hydrologic sequences can be studied by varying <br />the hydrology input data. This can be done in a number of ways <br />including: using the CRSS natural flow record and varying the starting <br />year of the hydrologic sequence, using the CRSS natural flow record and <br />averaging the results from several different hydrologic sequences, using <br />one or more synthetic or stochastic natural flow records instead of the <br />CRSS natural flow record, or lJlultiplying all values in a natural flow <br />record by different flow weighting factors. <br /> <br />Most studies involve a combination of the above. Studies involving <br />control data variations are often run with more than one demand schedule <br />to see what further effect varyi ng the 1 eve 1 of development mi ght have. <br />Studies involving control data or demand data variations are normally <br />run using a variety of hydrologic sequences to determine probable or <br />"average" results or to see the effect of different flow patterns and <br />volumes. <br /> <br />12 <br />