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12 Probable Effects of the Proposed Sulphur Gulch Reservoir on Colorado River Quantity and Quality <br />near Grand Junction, Colorado <br />4,000 <br />0 <br />z _.. <br />O _. _- <br />3,000 <br />w <br />EXPLANATION <br />~ Average annual hydrologic condition <br />Dry annual hydrologic condition <br />~ Wet annual hydrologic condition <br />~ 1974 :,. 1975 ~ 1976 1977 1978 1979 1980 <br />1981 ~ 1982 ~ 1983 ` 1984 ` 1985 ~ 1986 1987 <br />1988 ~-> 1989 1990 1991 1992 «~ 1993 1994 <br />~ 1995 1996 ~ 1997 1998 1999 ~ 2000 <br />Figure 5. Historical flow diversions at the Government Highline Canal. <br />functions, the reader is referred to Sargent and Wainwright <br />(1996). The runoff hydrograph for Sulphur Gulch was esti- <br />mated; salinity for water samples collected from the Sulphur <br />Gulch drainage during the spring 2002 runoff were plotted as a <br />function of observed (estimated from two streamflow measure- <br />ments made at the time of sampling) streamflow to compare <br />with the stochastic runoff-salinity equation derived later in this <br />report. <br />Table 4. Summary of fitted probability distributions to diversions <br /> <br />Diversions <br />January- <br />March Fitted probability distribution <br />February- October- <br />September December <br /> 0-90 days 91-321 days 322-365 days <br />Grand Valley Irrigation Canal Uniform Extreme value Uniform <br />Grand Valley Water Usersl Lognormal Beta Extreme value <br />Mesa Countyl None Extreme value None <br />Orchard Mesal Logistic Extreme value Extreme value <br />Palisade Irrigation Districts None Triangular None <br />I Collectie-ely account for water diverted by the Government Highline Canal <br />