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7/14/2009 5:02:37 PM
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UCREFRP
UCREFRP Catalog Number
9625
Author
Friedel, M. J.
Title
Probable Effects of the Proposed Sulphur Gulch Reservoir on Colorado River Quantity and Quality Near Grand Junction, Colorado.
USFW Year
2004.
USFW - Doc Type
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18 Probable Effects of the Proposed Sulphur Gulch Reservoir on Colorado River Quantity and Quality <br />near Grand Junction, Colorado <br />10,OOG <br />Q <br />CL <br />~_ <br />J <br />J <br />~~ <br />Zw <br />0 J 1,000 <br />J ~ <br />O W <br />!~ ~ <br />0 <br />W <br />J <br />O <br />C~ <br />~_ <br />f~ <br />100 <br /> <br /> <br />® <br />~ ,~i <br />L~ <br /> <br /> <br /> <br /> <br /> • ^ <br />0.01 0.10 1 10 100 <br />STREAMFLOW, IN CUBIC FEET <br />PER SECOND <br />EXPLANATION <br />Measurements-Dry Fork <br />Measurements-Sulphur Gulch <br />~ Realization 1 <br />Realization 2 <br />Fitted <br />Figure 14. Stochastic simulation ofdissolved-solids concentration in runoff at Dry Fork at <br />Upper Station (09095300) near De Beque with measurements at mouth of Sulphur Gulch <br />(3916071081535001. <br />(fig. 14). The fact that these two Sulphur Gulch measurements <br />appear at the margin of variability indicates that the use of this <br />equation is nominally conservative. On the other hand, addi- <br />tionalmeasurements are needed to decide whether the equation <br />should be shifted. The stochastic equations for streamflow, <br />evaporation, and salinity together with deterministic equations <br />for reservoir surface area and streamflow exceedance are incor- <br />poratedinto the mixing model. The mixing model itself is com- <br />posed of linked hydrology and water-quality submodels that are <br />described in the following sections. <br />Hydrology Model <br />The objectives of the hydrology model are twofold: <br />(1) compute the availability of pumpable water to the proposed <br />reservoir, and (2) provide flows at key hydrologic points in the <br />study reach that can be used by the water-quality model. <br />User-defined input that is required by this model includes pump <br />rate, beginning and ending pumping period days, Grand Valley <br />Irrigation senior and junior water rights, and maximum allow- <br />able return flow at Orchard Mesa Irrigation District check <br />structure. <br />To compute the amount of pumpable water requires six <br />primary steps. First, the daily flow in the Colorado River and <br />downstream demand (diversions) are generated on the basis of <br />random sampling of corresponding probability distributions. <br />The available daily flow then is computed by taking the differ- <br />encebetween these random variables. Second, the cumulative <br />distribution function for daily flow is computed to determine <br />the streamflow exceedance. Third, quartiles associated with <br />these daily flow exceedances are determined. Fourth, a check is <br />conducted to see if flow exceeds diversions (total demand). If <br />flow exceeds the total downstream demand (diversions), the <br />demand is subtracted from the Colorado River flow. If this dif- <br />ference is greater than zero, then that quantity is assigned as the <br />minimum divertible flow; otherwise, the minimum divertible <br />flow is set to auser-defined value. Fifth, a check for peak-flow <br />cut criteria is conducted. During the peak-flow check, if flow in <br />the Colorado River is between 12,900 and 26,600 ft3/s then a <br />zero value is assigned; otherwise the minimum divertible flow <br />value is used in the subsequent operation. In the subsequent <br />operation, the actual divertible flow is assigned as the lesser <br />value of the available flow or the peak-flow cut criteria. Sixth, <br />the pumpable flow is set to the minimum value between the <br />divertible flow and maximum pump rate. A flow chart describ- <br />ing the hydrologic model operations is provided (fig. l5), and a <br />description of the Excel cell-based equations is included as <br />Appendix 1. <br />Water-Quality Model <br />The objective of the water-quality model is to compute the <br />dissolved-solids concentrations (salinity) at points where water <br />enters or exits the study reach. User-defined input that is <br />required by this model includes initial reservoir volume and <br />concentration, total reservoir volume, seasonal release amount, <br />seasonal release period, and peak-flow release amount. The <br />background concentration at selected locations depends on <br />
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