Laserfiche WebLink
<br /> <br />o <br />') <br />~\ <br />W;;l' <br />-.J <br />Ii""" <br /> <br />Average Annual Flow Volumes (1979-1989) <br />(ACre-Feet per Year) <br /> <br /> Including Flood Flows <br />Gaae Flood Flows Removed <br />#9-4161;) Muddy River near Moapa 27,618 27,191 <br />#9-4181 Meadow Valley Wash at Rox 1,150 1,150 <br />#9-4190 Muddy River near Glendale 29,391 26,447 <br />#9-419515 Muddy River near Overton 6,084 4,293 <br /> <br />The ac~ual flow at the Overton gage is about 21 percent of the <br />Glendale gage flow. The difference in flow (volume) is due to <br />irrigation in Lower Moapa Valley. <br /> <br />Ground, Water <br /> <br />All water, except flood flows, enters Upper Moapa Valley as a <br />major ,underground source. several miles into the study area it <br />surfades in several large springs. In the area of the springs, <br />8,900 !acre-feet of ground water is pumped for irrigation, <br />munic~pal supply to overton, and cooling at Nevada Power <br />electtical generating plant. <br /> <br />About 4,900 acre-feet of groundwater is pumped from shallow wells <br />(to 100 feet deep) for irrigation in the Meadow Valley Wash area. <br /> <br />Littl. pumping occurs in Lower Valley because the quality of the <br />water!is poor for agricultural or domestic use. Ground water <br />sampl~s from wells in Lower Moapa Valley reflect the presence of <br />geoloqic formations containing soluble and,moderately soluble <br />minerals, such as halite (sodium chloride) and gypsum (calcium <br />sulfate). Sodium and calcium are the principal positive ions <br />found'in the ground water while sulfate and bicarbonate are the <br />predo~inant negative ions. <br /> <br />water'Rigbts and Water Use <br /> <br />The m~jor use of water is by irrigated agriculture in Moapa <br />valley. Water is also consumed by the Nevada Power electrical <br />generating plant, domestic uses, by phreatophytes and by <br />evaporation. The reuse of water in onfarm systems is minor. The <br />effect of water reuse on irrigation efficiency is small. The <br />principal reuse of water consists, of irrigation runoff, return <br />flowS" and power plant return flow in the Upper Valley being <br />delivered to the Lower Valley for irrigation. <br /> <br />19 <br />