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Last modified
1/26/2010 12:51:06 PM
Creation date
10/11/2006 11:49:53 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.33.K
Description
15-Mile Reach (UCRBRIP)
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1995
Author
Leonard Rice
Title
Palisade/Grand Junciton Stream Flow Analyses Update for 1994 Data
Water Supply Pro - Doc Type
Publication
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<br />. <br /> <br />. <br /> <br />USFWS - Palisade/Grand Junction Stream Flow Analyses - DRAFT <br />May 12, 1995 <br />'Page 23 <br /> <br />Based on this data and considering the miscalculations of local inflow possibly caused by <br />Grand Valley Project roller dam operations, precipitation, icing, an uncalibrated rating <br />curve at high flows, etc., we believe that the base local tributary inflow to the 15 mile <br />critical reach is on the order of 150 to 300 cfs. The data is insufficient to evaluate base <br />inflows beyond December. The local inflow for the dry hydrologic year of 1994 indicate <br />that the base flow may be typical for dry hydrologic years as well. <br /> <br />VIII ANNUAL LOCAL INFLOW <br /> <br />Hydrosalinity studies performed to support the 1979 Definite Plan Report of the Stage 1 <br />Grand Valley Salinity Unit indicate that the annual inflow between the Palisade gage and <br />27.5 Rd,gage approximates 114,000 acre-feet (at). Previously we reported the local <br />,inflow from the hydrosalinity study to be 38,500 af. A large part of the area tributary <br />to the critical reach was not measured or estimated. We have applied an average unit <br />runoff for the measured areas to the unmeasured areas to arrive at the 114,000 af <br />estimate. Its believed the measured flows in the hydrosalinity study was made during the <br />relatively dry year of 1976. <br /> <br />Extrapolation of monthly calculated local inflow in this study for the entire year imply <br />an annual inflow to the critical reach of 121,000 to 173,000 af. The extrapolated local <br />inflows are likely overestimated since they don't consider the likelihood of reduced local <br />inflows through out the winter-(See Figure 7). <br /> <br />More data would be required for the ungaged period (January- July) and from different <br />types of hydrologic years to define the average annual local inflows. However, the <br />limited data collected in 1991 through 1994 does seem to support an average annual <br />inflow to the critical reach exceeding 100,000 af. This estimate is subject to refinement <br />as additional data becomes available or additional analyses are performed. <br /> <br />IX RUEDI RESERVOIR RELEASES <br /> <br />Information on releases made from Ruedi Reservoir to benefit the critical reach flows in <br />1994 were collected from the Bureau of Reclamation. Reservoir releases began on July <br />29 and continued through October 7 for a total release of 20,000 af. The rate of release <br />ranged 20 to 225 cfs with the majority of releases made in the 150 to 225 cfs range. The <br />daily releases are summarized in Table 4. <br />
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