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WSP09437
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Last modified
1/26/2010 2:53:38 PM
Creation date
10/12/2006 3:38:31 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
7630.125
Description
Wild and Scenic - Colorado Wilderness Act - 1991
State
CO
Basin
Statewide
Date
1/21/1992
Author
Various
Title
Final Quantification Report and Public Comments
Water Supply Pro - Doc Type
Report/Study
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<br />. - ~ <br />UL <br /> <br />Streamflow is lowest during the winter and early spring. It begins to increase due to snowmelt <br />runoff sometime between the end of March and the middle of May. The higher flows <br />associated with snowmelt persist for one and a half to three months and there are typically <br />several peaks during this period. The annual bydrograph for 1938 is a typical example; see <br />Figure C. This is due to combinations of one or more factors, such as precipitation eventS, <br />shan-term changes in temperature, or the individual characteristics of the sub-watersheds. such <br />as slope, aspect. and elevation. There are also late summer and fall peaks associated with <br />frontal and thunder storms. Although the magnitude of these late season peaks varies and is <br />usually lower than those associated with snowmelt, they do occur every year. <br /> <br />Allow Hydroenpb <br />f'itdn Ri"ft' It UpPft" Wild~ess Bounduy <br />Sum or Pied... R, Wemi.Duche '" WiUiams Cr~k5 - 1'38 <br /> <br />1800 T <br />,.., T <br />~ ''''' I' <br />i"I:OO <br /> <br />] '000 f <br />~ 100 <br />J <br />1 600 1 <br />;~L <br /> <br /> <br />J~'----.!.J <br /> <br />------ <br /> <br />~~~s~~s~~g <br /> <br />S~~SS~ <br /> <br />1:: !:! ~ .... <br />:;:;-;:,~s <br /> <br />~ ~ ~ = ?3 <br />;:.;:,~O>-~ <br /> <br />Figure C <br /> <br />There is water appropriated upstream of the Piedra River at Bridge Ranger Station and the <br />Williams and Weminuche Creek gages. Based on information contained in Division of Water <br />Resources tabulations of rights, most of the larger appropriations were established prior to <br />1940. It is unknown whether records of acrual water use exist for the period the gages were <br />operated (1938 - 1954); none were located in the Division 7 archives in Durango. Family <br />farms and ranches were the dominant private land uses in the watershed during that period: it <br />is reasonable to assume that water users in the 1940's were diligent in the exercise of their <br />water rights. Therefore, the flows reaching these gages were a combination of unappropriated <br />water plus any return flows. Since 1950 changes in water use have induded the construction <br />of Williams Creek Reservoir and both new appropriations and abandonment of established <br />rights. Williams Creek Reservoir is managed by the Divison of Wildlife for fisheries and <br />recreation purposes and is operated on a tlow.through basis. The acreage of irrigated land <br />within the watershed has probably not changed substantially in the past fifty years. These gage <br />records are the best data currently available to determine the amouO[ of water available at the <br />upper wilderness boundary. <br /> <br />Page 5 <br />
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