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<br />ODfj2iJl
<br />
<br />CHAPl'ER V
<br />
<br />WATER RESOURCES
<br />
<br />duration, with a heavy load of sediment and debris. Only a small part
<br />of the runoff from the lower areas can be controlled and utilized. The
<br />erratic flows cannot generally be measured at reasonable cost.
<br />
<br />Both precipitation and the portion of the precipitation that con-
<br />tributes to runoff are greater on the mountain areas than on the lower
<br />lands. The relation of elevation to water yield, typical of the La Sal
<br />and Abajo Mountains, is illustrated in the chart below.
<br />
<br />RELATIONSHIP
<br />PRECI PITATION
<br />
<br />ELEVATION TO
<br />WATER YIELD
<br />
<br />OF
<br />AND
<br />
<br />Elevation
<br />( feet)
<br />
<br />Estimated mean annual runoff in
<br />hundred acre-feet per square mi Ie
<br />
<br />Annua I
<br />precipitatian
<br />(inChes)
<br />
<br />7
<br />
<br />9
<br />
<br />10
<br />
<br />8
<br />
<br />2
<br />
<br />3
<br />
<br />4
<br />
<br />5
<br />
<br />6
<br />
<br />
<br />".,...,.,.
<br />,...,.....
<br />., ,.,.,.,.
<br />,.....,..,
<br />....".,...
<br />..,......,
<br />",..,.,...
<br />,.,....,.,
<br />"".,.,...
<br />,.,....,.,
<br />...,.,.,.,.
<br />
<br />>
<br />,....
<br />
<br />()~$;
<br />
<br />:,::::;::::.:.:,:,
<br />..,...,.,'.'...',.
<br />,.,.., ..
<br />. ,"::,:,:.;,:,
<br />
<br />__ _-Typical Profile of the Abaja
<br />// and La Sol Mountains
<br />
<br />..;...i~/)....
<br />-~~:-Da7T .
<br />.,. /i(l
<br />
<br />;...;......~~~@:..'Jh
<br />
<br />Mast water yield originates at elevations above
<br />9,000 feet, offen in the form of snow
<br />
<br />Flow records of area creeks are shown in the table on the follow-
<br />ing page. At minimwn flows all of the streams are dry or nearly dry
<br />while maximwn flows of many streams have reached thousands of second-
<br />feet. In most instances some water is diverted from the streams above
<br />the gaging station. Locations of the gaging stations are shown on the
<br />map on page 45.
<br />
<br />Streamflow records and other data were used in a study of water
<br />yields of the La Sal and Abajo Mountains and other areas of Utah made
<br />by the Utah Agricultural Experiment Station in cooperation with the
<br />Utah Water and Power Board. Precipitation, vegetative cover, and the
<br />physiography and geology of the mountain areas were also considered in
<br />estimating water yields in a September 1964 report entitled "Water Yields
<br />in Utah" published as Special Report 18 of the Experiment Station.
<br />
<br />46
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