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WSPC01225
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Last modified
1/26/2010 11:10:16 AM
Creation date
10/9/2006 2:38:13 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8283.100
Description
Colorado River Computer Models - Colorado River Simulation System - Reclamation - CORSIM
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
12/23/1993
Author
Unknown
Title
Reclamation Proposed Surplus Guidelines - Draft
Water Supply Pro - Doc Type
Report/Study
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<br />001246 <br /> <br />of avoidance of a flood control mandated release. Shortage threshold set at <br />elevation 1120 feet. <br /> <br />RESERvom STARTING CONDmONS <br /> <br />An analysis was also developed to examine the effect of starting runs at full reservoir <br />conditions versus existing reservoir conditions. <br /> <br />ADDmONAL MODEL RUN OBSERVATIONS <br /> <br />During the study, hydrologic and water use changes occurred that forced Reclamation to <br />revise and rerun the model studies. The most significant change was the most recent CAP <br />projected water delivery schedule which extended the time frame when Arizona would be <br />fully diverting their apportionment until year 2035, and which extended out the year that the <br />lower basin would be using less than full projections of 7.5 maf apportionment until <br />year 2009. <br /> <br />CRSS-EZ MODEL RUN OBSERVATIONS <br /> <br />Recognizing that the change in CAP schedule altered the effects and results of the model <br />runs, and recognizing that Basin States had not reached consensus on a methodology, <br />Reclamation was asked to, redevelop the runs and make a proposal to the States as to an <br />appropriate surplus methodology. <br /> <br />After changing the starting conditions and the depletion schedules numerous CRSS-EZ runs <br />were made to increase the understanding of the system, and of the effect of alternate surplus <br />and shortage provisions. Initially the runs focused on modeling the system under full <br />development conditions. Under full development the governing principal that appeared to <br />dominate the water supply of the lower basin is the recognition that within the lower basin <br />the total of uses and losses exceed the total average supply. <br /> <br />The upper basin objective minimum release is to supply 8.23 maf to the lower basin. To <br />assure that this supply can be provided a critical period of record was established for the <br />upper basin. The critical period assumed is that period of hydrologie record in which Lake <br />Powell would experience the greatest reduction in storage over the entire hydrologic record <br />under specific release eonditions. The critical period of record is a function of the <br />hydrology, and demands. The upper basin in theory maintains sufficient storage in upper <br />basin reservoirs (602(a) requirement) such that an average 8.23 maf of minimum flow can be <br />provided to the lower basin through the critical period of record without impairment to upper <br />basin uses or without impacting the minimum power pool. [n addition the 602(a) restricts <br />the equalization provision such that equalization is not required if upper basin reservoir <br />storage is below the 602(a) storage level. <br /> <br />18 <br />
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