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Last modified
1/26/2010 12:50:04 PM
Creation date
10/11/2006 11:41:16 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.10.A
Description
Colorado River Annual Operating Plans
Basin
Colorado Mainstem
Date
7/15/1987
Author
USDOI/BOR
Title
Recommended Process for Developing Annual Operating Plans for the Colorado River System Under Full Reservoir Conditions - Draft Report
Water Supply Pro - Doc Type
Publication
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<br />'I <br /> <br />~ <br /> <br />For plan development, monitoring, and assessment <br />purposes, the water year has been subdivided into three <br />distinct operational per iods: (1) October through Decembeq <br />(2) January through June; and (3) July through September. <br />Decisions on excess water releases would be made separately <br />for each of these periods. Continuous monitoring of river <br />conditions during each period would lead to decisions as to <br />whether excess releases should be initiated or terminated <br />during any given period. <br /> <br />Although AOPs are developed, pursuant to the Operating <br />Criteria, for the following water year (October through <br />september), it is appropr iate to discuss the process as <br />beginning with release decisions during the July through <br />september period of the current water year. This is the <br />initial period wherein operations would be modified to gain <br />subsequent flexibility for the coming water year. The three <br />operational periods are described in the following sections. <br /> <br />3.3.2 JU1~_!~~~~~~_~~E!~~~~. The reassessment of <br />release decisions during this period establishes the link <br />between the current operatin~ year and the plan projected for <br />the following operating year. During this period, <br />reassessment of the current year's operation and the <br />development of the subsequent year's operation are occurring <br />simultaneously. This is done in recognition of the fact that <br />excess releases made during this period may have significant <br />impacts upon the following year's operation. <br /> <br />Under the Base Case operation, releases dur ing this <br />period are to meet downstream requirements only, assuming <br />that mandatory flood control releases are less than the user- <br />defined release pattern. Excess releases during this period <br />would serve to reduce the probability of high winter flood <br />control releases, thereby providing additional river <br />regulation and flood control benefits. with regard to <br />consideration of other potential benefits, excess releases <br />dur ing this per iod would produce addi tional hydropower <br />generation benefits. Excess water releases would yield a <br />significant increase in power revenues, since July, August <br />and September are high value power months. <br /> <br />Typically, the water supply information available in <br />assessing whether to make these excess releases include: 1) <br />forecast of actual runoff for the remainder of the current <br />water year., 2) forecasted runoff volumes for October through <br />December, 3) conditioned probable water supply forecasts for <br />January through July and beyond. <br /> <br />-31- <br />
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