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Last modified
1/26/2010 12:36:45 PM
Creation date
10/11/2006 11:06:20 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.105.LJ
Description
Navajo Reservoir
State
NM
Basin
San Juan/Dolores
Date
9/18/1987
Author
USDOI-BOR
Title
Hydrologic Determination - 1987 - Water Availibility from Navajo Reservoir and the Upper Colorado River Basin for Use in New Mexico
Water Supply Pro - Doc Type
Report/Study
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<br />. <br /> <br />. <br /> <br />. <br /> <br />B. Conclusions and Recommendations <br /> <br />Table 2 shows a summary of the results of this investigation. <br /> <br />study <br />1967 study <br /> <br />Hydrology <br />virgin Flow <br /> <br />Current Studies <br /> <br />Maintain <br /> <br />Min. Pools CRSS Nat'l <br /> <br />CRSS Nat'l <br /> <br />Use <br />Min. Pools CRSS Nat'l <br />CRSS Nat'l <br />1/ Yield has approximately a <br />about a 6% shortage. <br /> <br />TABLE 2 <br /> <br />Summary Results <br /> <br />storage <br />(MAF) <br />26.232 <br /> <br />Min. <br />Release <br />(MAF) <br />8.25 <br /> <br />Firm Yield <br />Without with Tolerable <br />Shortages Shortages 1/ <br />(MAF) (MAF) <br />5.45 5.80 <br /> <br />20.197 <br />20.197 <br /> <br />8.23 <br />7.5 <br /> <br />5.55 <br />6.28 <br /> <br />6.00 <br />6.77 <br /> <br />23.141 8.23 <br />23.141 7.50 <br />98.5% probability <br /> <br />5.67 <br />6.40 <br /> <br />6.09 <br />6.88 <br /> <br />of being sustained with <br /> <br />Use of the CRSS hydrology data base and system storage availability as <br />determined from the use of CRSS indicate that the upper Basin firm yield, <br />.without acceptable shortages, is about 100,000 acre-feet greater than was <br />previously thought, based on other similar assumptions. At the previous <br />estimate of firm yield at 5.45 MAF, the application of risk and shortage <br />criteria resulted in a reasonable depletion level of 5.8 MAF. Applying <br />similar risk and shortage criteria to the present hydrologic determination <br />as those applied to earlier determinations, the increase of upper Basin <br />firm yield to 5.55 MAF will result in a reasonable depletion level of 6.0 <br />MAF. This has been discussed with the Basin states and the magnitude and <br />consequences of such risk and shortages are understood. Therefore, based <br />on an allowable over-all basin shortage of six percent and a probability of <br />meeting the demands about 98.5 percent of the time (see Figure 1), it is <br />recommended that the Secretary certify that 6.0 million acre feet is <br />reasonably available in the Upper Basin for beneficial consumptive use. <br /> <br />11 <br />
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