Water Resource Systems and Modeling of the Lower Virgin River Using EXCELby Duke Mojib,
Abstract: (No paper) The first objective of this study was to determine the availability of water at the confluence of the Halfway Wash and the Virgin River and to simulate the diversion of river water while considering the phreatophyte water requirement downstream of the project site. A 30-foot high diversion dam was designed in the Virgin River at its confluence with the Halfway Wash. A pumping station facility was sized and planned that would pump the water to an off site storage dam, that was also designed, in the Halfway Wash with a storage capacity of 113,000 acre-feet. The U.S. Geological Survey had produced 63 years (water years of: 1930-1992) of mean daily flow record at Littlefield, Arizona gauge site (Upstream of the project site) and seven years (water years of: 1978-1983 and 1985) of mean daily flow record at Halfway Wash. A regression analysis was applied to the river flow data of these two gauge sites for water years 1978-1983 and 1985. The regression equation that was generated from this analysis was used to generate mean daily flow values at the project site. The model simulated the availability of water at the Halfway Wash (the project site) and facilitated the capability of using different bypass flow values. The second objective was to size the diversion dam, the off site storage dam, the diversion pumping station, the transmission pumping stations and pipelines that were to deliver the water to the Las Vegas Valley. Through this modeling effort, all the infrastructure for this project was sized with a high degree of accuracy.
Subject Headings: Water resources | Hydrologic models | Rivers and streams | Pumping stations | Water flow | Spreadsheets | Water storage | Regression analysis | Water use | Spillways | Waste storage | Dams | North America | United States | Nevada | Las Vegas | Arizona
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