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Last modified
7/14/2009 5:02:31 PM
Creation date
6/1/2009 12:43:40 PM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
7886
Author
Hydrosphere Resource Consultants.
Title
Yampa River Basin Recommended Alternative, Detailed Feasibility Study
USFW Year
1995.
USFW - Doc Type
Final Report.
Copyright Material
NO
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IJ <br />Reservoir Operating Studies <br />An important limitation imposed by the use of monthly hydrology is the inability to <br />accurately assess effects on peak flows and on flows during periods of rapid change. For <br />example, an average July flow of 900 cfs might in reality be a flow of 2,000 cfs at the <br />beginning of the month and 200 cfs at the end of the month. <br /> Water Demands <br /> Existing basin water uses are generally represented in the model through the use of <br /> gaged flow hydrology rather than virgin flow hydrology. Implicit in this method is the <br /> assumption that those historical water use patterns imbedded in the gaged hydrology will <br /> continue in the future as they have in the past, unaffected by any additional water development <br /> or management simulated explicitly in the basin model. <br /> Exceptions to this generality include major municipal and industrial uses relying on water <br /> rights junior to the Juniper Project rights and longstanding agricultural uses that, by virtue of <br /> late adjudication, have water right priorities that are junior to the 1954 Juniper Project rights. <br /> Depletions associated with these existing junior uses were explicitly represented in the model <br /> rather than implicitly represented by the gaged (depleted) hydrology in order to the evaluate the <br /> effect of the Juniper Project water rights on other basin demands and to estimate the project's <br /> contemplated draft. In the Phase I Study, approximately 13,000 of of agricultural depletions <br /> with junior water rights were thus explicitly represented; these depletions were derived from <br /> data provided by Division 6 but did not include diversions with estimated annual depletions less <br /> than 5 of or reservoirs with estimated depletions of less than 700 af. In the present study the <br /> model was modified to include an additional 4,000 of of junior depletion attributable to these <br /> smaller agricultural uses. The resulting total of roughly 17,000 of includes all junior <br /> agricultural depletions estimated by Division 6. <br />Three basic demand data sets were defined for use in the basin model, representing three <br />levels of water demands. These demand levels were defined during the Phase I Study as <br />representative of current (1989) potential demands and demands associated with population and <br />industrial growth projected for the years 2015 and 2040. A fourth demand scenario reflecting <br />consulted-upon levels of depletion was defined for use in certain model runs. <br />I Current Potential Demands <br />The current potential demand level was defined by making certain adjustments to <br />recently observed water diversions and depletions. These adjustments were of two general <br />types: 1) adjustments to "level out" historical demands over the entire 53-year study period, <br />and 2) adjustments to account for the fact that observed historical water deliveries do not <br />completely describe water demands. The former adjustment is made in recognition of the fact <br />that water demands to certain sectors, notably municipal and industrial, have grown and <br />changed significantly over the 1930-82 study period. The second adjustment is made in <br />recognition of the fact that, even under current development conditions, there is potential for <br />increased water use due to climatic factors, greater utilization of generating capacity at power <br />plants, repair of washed out headgates, etc. Accordingly, the current potential demand level <br />reflects the maximum estimated water requirement associated with current basin development <br />imposed uniformly upon the hydrology of the 1930-82 study period. Table 2-1 below <br />2-3
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