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WSP07833
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Last modified
1/26/2010 2:29:04 PM
Creation date
10/12/2006 2:37:45 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8142.600.30.A
Description
Other Studies - Purgatoire River Transit Loss Study
State
CO
Basin
Arkansas
Water Division
2
Date
6/1/1953
Author
Corps of Engineers
Title
Review Report on Survey for Flood Control - Volume I
Water Supply Pro - Doc Type
Report/Study
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<br />e <br /> <br />- <br /> <br />,e <br /> <br />e <br /> <br />* <br /> <br />{ 0658 <br /> <br />is at N1rte' Mile Dam, about 83 ~iver miles below Altkif&l with about 1,550 <br /> <br /> <br />sqtiar~ m11~s ~f ~hbsrven1tig drainage ateal Thus th~ red6~d of return <br /> <br /> <br />flow from the presently irrigated area beiow Trinidad is inadequate to con~ <br /> <br /> <br />elusively evaluate the net effect of consumptive use or ~tream losses. <br /> <br />Detailed runoff data are included in appendix B. <br /> <br /> <br />35. Sediment. - The forested area in the western mountainous por- <br /> <br />tion of the Purgatoire River watershed is not .a deleterious source of <br /> <br />sediment; but the lower reaches of the tributaries have sizeable debris <br /> <br /> <br />cones and there is considerable evidence of lateral erosion. The steep <br /> <br /> <br />slope of the river, lack of vegetative growth in the channel, and the un- <br /> <br />consolidated state of the bed material is also conducive to considerable <br /> <br />bed load movement. Records of suspended sediment samples indicate an <br /> <br /> <br />average annual rate of 812 acre-feet of suspended sediment passing Trini- <br /> <br /> <br />dad, Colorado. This high average rate was caused by a disproportionate <br /> <br />amount of sediment carried by the 1942 flood, and therefore the indicated <br /> <br />rate for the period has been modified downward in arriving at the average <br /> <br /> <br />rate of suspended sedimer~, estimated at 560 acre-feet per year, passing <br /> <br /> <br />Trinidad. This is equal to ~n annual suspended sediment production rate <br /> <br />of about 0.7 acre-feet per square mile. In addition, it is estimated <br /> <br /> <br />that the bed load passing Trinidad amounts to about 60 acre-feet per year. <br /> <br />A detailed discussion of sediment is presented in appendix B. <br /> <br /> <br />36. Historical floods. - Historical accounts previous to the gen- <br /> <br />eral establishment of stream gaging stations include references to three <br /> <br /> <br />major floods on the Purgatoire River at Trinidad prior to 1904. Accord- <br /> <br /> <br />ing to these accounts, the three major floods occurred in November 1866, <br /> <br />the sun~er of 1883, and July 1886. <br /> <br />37. Major floods of record. - Discharge. data are available for the <br /> <br />four major floods at Trinidad, which occurred on the following dates: <br /> <br />September 30, 1904; July 22, 1925; April 23, 1942; and August 2, 1950. <br /> <br /> <br />The maximum recorded peak discharge of 45,400 cubic feet per second <br /> <br />13 <br /> <br />.c <br /> <br />~~ <br /> <br />
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