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Last modified
1/26/2010 12:51:22 PM
Creation date
10/11/2006 11:53:32 PM
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Fields
Template:
Water Supply Protection
File Number
8141.700
Description
Fryingpan-Arkansas Project - Annual Operating Plans and Reports
State
CO
Basin
Arkansas
Water Division
5
Date
11/1/1971
Author
US DoI BoR
Title
Annual Operating Plan Fryingpan-Arkansas Project Colorado 1971 -1972
Water Supply Pro - Doc Type
Annual Report
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<br /> <br />. <br /> <br />. <br /> <br /> <br />. <br /> <br />{ f"'~-1 <br />l ~1iU ~ <br /> <br />simulate operations with extremely high or extremely low water supply condi- <br />tions. Reservoir inflow in 1972 has a 1-in-l0 chance of being less than the rea- <br />sonable minimum and a 1-in-l0 chance of being greater than reasonable maxi- <br />mum. Therefore, actual operations in 1971 have an 8-in-10 chance of falling <br />between the limits of the extreme studies. The third study simulates operations <br />with most probable water supply conditions. <br /> <br />In preparing the operation studies, it was intended to provide the necessary <br />flexibility to change from one set of conditions to another. The ever-changing <br />situation regarding inflows, downstream requirement, etc., will require many <br />adjustments. Operation schedules will be adjusted as required. Forecasts of <br />the April through July reservoir inflow will be started on March 1, 1972, and <br />continue on the first of each succeeding month through May 1. <br /> <br />Ruedi Reservoir <br /> <br />Operation of Ruedi Reservoir through November 15 is in compliance with a re- <br />quest by fish and wildlife interests, Releases from the reservoir are to be held <br />to 100 c. f. s. for the period October 1 through November 15, Then, in order to <br />provide maximum flood protection below the dam, the reservoir will be drawn <br />down by March 31 to a point where refilling would be assured under reasonable <br />minimum inflow conditions, theoretically to 57,300 acre-feet, In actual prac- <br />tice, an estimate of probable inflow would be made early in March based on <br />March 1 snow forecast, and drawdown would be adjusted accordingly. Also in <br />practice, icing condltlons on the Fryingpan River below Ruedi Dam might dictate <br />a reduction in releases. <br /> <br />After April 1, under reasonable minimum inflow conditions, the reservoir would <br />refill by July 1 if only required fish bypasses were made and the remaining in- <br />flow stored. As a result of a request by western slope recreation interest, it is <br />planned that the water level in Ruedi Reservoir will be held at one foot above the <br />elevation of the foot of the Forest Service boat ramp. This would make the mini- <br />mum water surface elevation 7706.0 feet. Reservoir capacity at this elevation <br />is 53,122 acre-feet. Under reasonable maximum and most probable inflow con- <br />ditions, the reservoir could theoretically be drawn down to this capacity. In <br />each case, the reservoir would be full by the first of July to provide optimum <br />recreation benefits during the summer months. <br /> <br />Operation plans call for drawing the reservoir down to a point 2 feet below the <br />spillway crest and holding at this stage untll August 1. For the remainder of the <br />water year, releases equaling the reservoir inflows will be made, but in the <br />month of August releases of not less than 150 c. f, s. will be made. <br /> <br />Table 3 and exhibit 5 show anticipated 1972 water year operation of Ruedi Res- <br />ervoir. <br /> <br />12 <br /> <br />
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