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Last modified
1/25/2010 6:47:21 PM
Creation date
10/5/2006 1:02:10 AM
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Fields
Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Dams and Rivers A Primer on the Downstream Effects of Dams
Date
6/1/1996
Prepared By
USGS
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br /> I 50.000 ~ <br />'i'i 125.000 <br />" <br />0 <br />v <br />" <br />~ 100.000 <br />:u <br />0- <br />~ <br />~ 75.000 <br />v <br />:i5 <br />" <br />~ <br />" 50.000 <br />~ <br />~ <br />-" <br />v <br />~ <br />is 25.000 <br /> 0 I 5 <br /> <br /> 140,000 <br /> 120,000 <br />'i'i <br />" <br />0 <br />v 100,000 <br />" <br />~ <br />:u <br />0- <br />~ 80,000 <br />~ <br />v <br />:i5 <br />" 60,000 <br />~ <br />" <br />~ <br />~ 40,000 <br />-" <br />~ <br />is <br /> 20,000 <br /> 0 t915 <br /> <br />llJear'RoO&ev.I~.bG_ <br />Stewam\lounrain 0arn <br />, . .. .. . <br /> <br />fa <br /> <br /> <br />10 <br /> <br />30 <br /> <br />t 5 <br />January 1993 <br /> <br />20 <br /> <br />25 <br /> <br /> <br />Hydrogroph o(the Soft Rive, for January /993. Peak <br />discharge reached /43,000 ~31s on January 9 above <br />Roosevelt Dam. Releases (rom Stewart Mountain Dam, <br />the farthest downstream of (our dams on the Soft, ore <br />dampened and protracted compared to the jn~ow <br />to Roosevelt Lak.e. <br /> <br />iii WiT1!er <br />III S1ir~& <br />. S';"'mer <br />"".+J <br />. FaU <br /> <br /> <br />1925 <br /> <br />1935 <br /> <br />1945 <br /> <br />1955 <br /> <br />1975 <br /> <br />1985 <br /> <br />1965 <br /> <br />Annual ~ood series for the Soh River. The Jorge voriabi/;ty in annual poods is an environmental <br />stress to which native riparian vegetation and ffshes have adopted. <br /> <br />Unregulated rivers in the western United States carry prodigious amounts of sediment <br />during floods. The Salt River is no exception. The sediment load carried by the Salt can <br />vary by orders of magnitude. Much of the year, the river is relatively clear. But in a large <br />flood. the Salt can carry extremely large quantities of sediment. scouring material from the <br />bottom and sides of its channel that normally is not disturbed by the flow of the river. <br />The amount of sediment transported by a river. termed its capacity. increases dramati- <br />cally with discharge. typically in an exponential fashion. That sediment may be suspended <br /> <br />12 <br />
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