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WSP06927
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Last modified
1/26/2010 2:24:57 PM
Creation date
10/12/2006 1:59:24 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09B
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
7/1/1990
Author
BOR
Title
GCD EIS Summary of "Long List" of Alternatives
Water Supply Pro - Doc Type
EIS
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<br />"~--"'~~-~_.;,.J"-;": <br /> <br />through Glen Canyon Dam, and (b) releases of water <br />quantities greater than 8,23 maf. <br /> <br />a. During an 8.23 maf year, the following water-release <br />strategy would be followed. <br /> <br />* November through March there would be a constant <br />steady flow of 7,000 cubic feet per second (cfs) <br />released through Glen Canyon Dam. <br /> <br />* In April, the released flows would begin to increase <br />at a daily, equal increment (approximately 291 cfs <br />in this example) until a flow of 15,320 cfs is <br />reached by May 1. <br /> <br />* The releases during May through September would be <br />maintained at a steady constant flow of 15,320 <br />cfs. <br /> <br />* Beginning October 1, flows would be decreased by a <br />daily, equal increment (approximately 291 cfs in <br />this example) until a flow of 7,000 cfs is reached <br />by November 1. The cycle would then resume with <br />another water year. <br /> <br />b. During years when amounts greater than 8.23 maf would <br />be released, the following strategy would be followed: <br /> <br />* November through March there would be at a constant <br />steady flow of up to 8,000 cubic feet per second <br />cfs released through Glen Canyon Dam. The 8,000 <br />cfs is a maximum minimum and would not be exceeded <br />during this period. <br /> <br />* In April, the released flows would begin to increase <br />at a daily, equal increment until a high steady <br />flow is reached by May 1. In the group's example, <br />this flow was identified at 16,500 cfs, but in <br />reality would be adjusted to accommodate the <br />needed releases. <br /> <br />* The releases during May through September would be <br />maintained at a steady constant high flow (e.g., <br />16,500 cfs) <br /> <br />* Beginning October 1, flows would be decreased by a <br />daily, equal increment until a maximum minimum <br />flow of 8,000 cfs is reached by November 1. The <br />amount of water that must be released during the <br />following year would then dictate the release <br />strategy (a or b). <br /> <br />11 <br />
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