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Last modified
1/26/2010 2:27:28 PM
Creation date
10/12/2006 2:24:40 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8283.100
Description
Colorado River Computer Models - Colorado River Simulation System
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
9/20/1996
Author
Unknown
Title
Graphic Analysis of CRSSEZ Reservoir Simulations - Draft
Water Supply Pro - Doc Type
Report/Study
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<br />u U .~.,J L:-; ;:-; <br /> <br />C. MODEL INPUTS. <br /> <br />The CRSS-ez Model combines the three fundamental inputs of historical runoff or inflow, future <br />use projections, and operating criteria, to simulate the future inflow, and model the outflow, and <br />change in storage of each of the three reservoirs. <br /> <br />Hydrology: The input hydrology, see Table 1 of Appendix 1, consists of the combined annual <br />natural runoff from tributaries above Powell, within the reach of Glen to Hoover, within the <br />reach from below Hoover to Morelos Dam at the Northerly International Boundary with Mexico, <br />and for the Gila River. The input hydrology was developed based on historical records over the <br />1906-1995 period, <br /> <br />Natural Runoff: The term "Natural" runoff refers to historically measured or estimated runoff, <br />adjusted so that the storage and use effects caused by man are removed. <br /> <br />Trace: When a model run is conducted, a block or sequence of hydrology is first assembled to <br />simulate how the reservoir system would respond to one example of a future hydrologic <br />scenario. To simulate the operation over the time period 1996 to 2050 (54 years), a 54-year trace <br />of hydrology would be assembled. <br /> <br />For example, as shown in Figure 4, one 54-year trace of historical hydrology was used to <br />simulate the system operation, Figure 4 shows Trace 1 of Lake Mead elevations for the <br />simulated period 1997-2050. The first year of hydrology was 1906. The elevation values are <br />those given for Trace 1 on page 1 of the model output section in the last column labeled <br />M _ ELEV. This trace shows how Lake Mead would fluctuate if the exact sequence of hydrology <br />and uses were to occur and operating criteria for 70% spill avoidance surplus and 80% protection <br />of elevation 1050 shortage was followed. A single trace is useful when showing the effect of the <br />critical period of hydrology. The critical period begins in 1930 if critical period is measured in <br />terms of Lake Mead drawdown. <br /> <br />6 <br />
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