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<br /> <br />o <br />) <br />('.,,;) <br />W <br />-J <br />o <br /> <br />Muddy ~iver is also gaged about 12 miles further downstream at <br />the lo~ation of the Narrows which separates Upper Moapa Valley <br />from Lower Moapa Valley. This gage (#9-4190) is referred to as <br />Muddy ~iver near Glendale, Nevada and is located below the <br />confluence of Muddy River, Meadow Valley Wash and California <br />Wash. ,Flow records for this gage are also available for water <br />year 1~51 through 1989 with the exception of water year 1984. <br /> <br />A thir~ gage has been established on Muddy River. It is located <br />near Overton (#9-419515) and measures virtually all of the <br />surface water that flows into Lake Mead from Lower Moapa Valley. <br />This g~ge went into operation on October 1, 1979 and flows were <br />recorded through September 1983. The gage was not in operation <br />during,water year 1984 but was reestablished for water year 1985. <br />Since ~hen, daily flows have been recorded to the present. <br /> <br />Surfac~ flow in Meadow Valley Wash is measured at a stream gaging <br />station (#9-4187) near Rox, Nevada which is located about 16 <br />miles ~orth of Glendale. Measurements were initiated in March <br />1987 apd have been continued to date. For the 3-1/2 year period <br />of record (1987-1990), the average annual flow was 1150 acre- <br />feet. : The average monthly flow volume varied from a low of 40 <br />acre-f~et in July to about 130 acre-feet from December through <br />April. Downstream of the Rox gage, the surface flow goes <br />underg~ound and does not reappear as surface water except during <br />periods of large rainstorms. <br /> <br />Tribut~ry areas contribute little water. Less than five percent <br />of the: average annual flow is produced by surface runoff from <br />summer: storms. Runoff from Meadow Valley Wash and California <br />Wash only occurs during infrequent large convective storms, but <br />accoun~s for the increase in total flow between the Moapa and <br />Glenda'le gages. <br /> <br />There were only 4 years in their period of record when the Moapa <br />and G~endale gages were not affected by flood flows (1963, 1974, <br />1987 ~nd 1989). The largest flood volumes recorded were 2770 <br />acre-feet in 1967 at the Moapa gage and 12,290 acre-feet in 1978 <br />at the Glendale gage. <br /> <br />There ~as been a decline in the flow passing the Moapa gage. <br />Some ~ecline is due to a pipeline installed in 1962 to deliver <br />water :from the springs to Overton for domestic use. Also, in <br />1975 ~evada Power began diverting water for use in their power <br />plantlon the Muddy River in Upper Moapa Valley. The decline at <br />the G]endale gage has nearly equalled the Moapa gage decline. <br /> <br />For a~alysis for this report, flows for 1979 through 1989 were <br />used for all gages, except Rox which uses the only records <br />avail~ble (1987-1990). A comparison of total annual flows and <br />annuat flows with flood volumes removed is displayed in the <br />following table. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />J <br /> <br />18 <br /> <br />