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Last modified
1/26/2010 12:52:45 PM
Creation date
10/12/2006 12:02:02 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8446
Description
Cache La Poudre Platte Project
State
CO
Basin
South Platte
Water Division
1
Date
11/1/1962
Author
BOR, DoI
Title
Reconnaissance Report, cache La Poudre Unit, Colorado Peak Division, Missouri
Water Supply Pro - Doc Type
Report/Study
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<br /> <br />18 <br /> <br /> <br />. <br /> <br />Loca.l reports indicate that considerable capacity in the <br />plains reservoirs has been lost through sediment accumulation and <br />deterioration of the old reservoir dikes and outlet works. <br /> <br />Accurate information on the operation and efficiencies of these <br />plains reservoirs is unavailable. Except for a fe1f records of reser- <br />voir releases, the only records are monthly contents based on gage <br />height readings. Only the contents of the larger reservoirs, about <br />28, are reported to the State Engineer. Their total combined <br />capacity is 147,000 acre-feet, or 91 percent of the total decreed <br />capacity. <br /> <br />The monthly reservoir contents from 1930 to 1949 were tabulated <br />for the South Platte Basin Report. This tabulation showed maximum <br />and minimum aggregate contents of the reported reservoirs of 133,800 <br />acre-feet and 5,100 acre-feet, respectively. The reservoir contents <br />of May 1 and November 1 were tabuJ.ated from the Water Conunissioner's <br />reports for the 1947 to 1960 period. An estimated operation of the <br />plains reservoirs, considered as a group, was derived. for the <br />1947-1960 study period by correlating the above-mentioned ta9'-Vt..,ions <br />with water supply conditions. The resuJ.ting average ~lyi~d of <br />the plains reservoirs was 60,000 acre-feet for the 1947-1960~Period, <br />ranging from a minimum of 22,000 acre-feet in 1957 to a maximum of <br />90,000 acre-feet in 1947. <br /> <br />. <br /> <br />Based on the length of feeder canals and other studies in the <br />South Platte Basin, cane.1 losses were estimated to be 20 percent of <br />the diversions made from the river to storage. The average annual <br />net surface loss was estimated at 1.78 acre-feet per acre for the <br />plains reservoirs which have a total surface area of 10,000 acres. <br /> <br />The storage decrees of the plains reservoirs are junior to most <br />direct use rights on the Cache la Poudre. The major diversions to <br />storage occur during the spring runoff from flows in excess of the <br />diversions under direct flow rights. In the nonirrige.tion periods <br />the stream flow is generally diverted to storage as well as an <br />estimated 28 percent of the return flow. <br /> <br />. <br /> <br />The analysis of the plains reservoir operation indicates maximum <br />storage generally occurs by the end of June with the reservoirs being <br />drawn dmm as needed until the end of the irrigation season in <br />September. Analysis of past reservoir operations indicated a storage <br />carry-over of at least 20,000 acre-feet is desired for operations. <br />~!iieRng~igM fiw~ ~~r{j~s ~f storage also provides considerable <br /> <br />Surplus Flows <br /> <br />In some years large quanti ties of water are still unregulated <br />in the Cache la Poudre River. Whenever the pla1ns reservoirs are <br />filled, water in excess of the needs of the direct flow appropriations <br />passes out of the basin unused. <br />
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