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<br />
<br />Lower Basin Reservoirs
<br />
<br />Hoover Dam
<br />Lake Mead
<br />I
<br />
<br />
<br />-.......:..~:~. "... <',
<br />Chart 7 "'",-.....:.;L:
<br />
<br />5T A. TISTlCS
<br />ACTIVE STORAGe"
<br />(ACRE.FEET) elEVATION (FEET)
<br />
<br />AEs.ERVOIR
<br />MAXIMUM STORAGE
<br />RATED HEAD
<br />MINIMUM PowER POOL
<br />SURFACE. AREA (FULL)
<br />RESERVOIR U.NGTH IFULLI
<br />POWER PLANT
<br />NUMBER OF UNITS
<br />TOTAL CAPACITY OF 'IN:rs
<br />
<br />27.377.000
<br />13.653,000
<br />lO.O~4,OOO
<br />162.700 ACRES
<br />!lSMILES
<br />
<br />1219
<br />1123
<br />1083
<br />
<br />"
<br />1,344,800 KIlOWAiTS
<br />
<br />'does nOI include 2,318JJOO dca~"eer of de;Jd wJrdge below elev;Hlon 895 fee'
<br />
<br />J
<br />z
<br />o 20
<br />u
<br />w
<br />~
<br />>:
<br />w 10
<br />w
<br />w
<br />~
<br />m
<br />~ 0
<br />:; 20
<br />o
<br />o
<br />
<br />Loke Mead at the beginning of water year 1971
<br />had a water surface level of ],152,58 feet and an
<br />active storage of 16,769,000 acre.feet. During
<br />the water year releases were made to meet down-
<br />stream water use requirements in the United
<br />States and Mexico, programmed levels of Lakes
<br />Moh,lVc and Navasu, and transit losses which
<br />include river and reservoir eV3poration, lIses by
<br />phreatophytes, changes in bank storage, un.
<br />measured inOows and diversions, etc, The total'
<br />release from Lake Mead through Hoover Dam
<br />was 8,233.000 acre.feet. At the end 01' the water
<br />year, Lake Mead had a water surface elevation
<br />of 1,153.61 feet and an active storage of
<br />16,886,000 acre.feet, which reOecls an increase
<br />in storage during the water year of 117,000
<br />acre-fee t.
<br />
<br />Lake Mead is the only reservoir on the Colorado
<br />River in which a specified space is exdusi,dy
<br />allocated for mainstream Oood control. Flood
<br />control regulations have been published, These
<br />regulations take into account effective space in
<br />CRSP reservoirs as well as in Lake Mead,
<br />
<br />Space in Lake Mead and CRSP reservoirs during
<br />water year 197 I was such that no unusual
<br />Hoover releases were required to operate pur-
<br />suant to provisions of the flood control
<br />regula tions, (Chart 7)
<br />
<br />OUTFLOW
<br />
<br />"-"~\
<br />
<br />AVERAGE
<br />
<br />,
<br />\
<br />" 'l. :\
<br />:C(' '\
<br />.~ \
<br />",..... .
<br />'.-\\ "\
<br />. :. \ '..
<br />.\. \ "
<br />'" ",,' "'~": \
<br />',"<. ,.\.\
<br />. " '. - \. \' ~.
<br />~< '--, '. \>,,~ \\
<br />. ""',", ,....'\.
<br />'''~''':'~ '< '- '.,
<br />. ." .'>, .... -~,
<br />
<br />-''",- ~ ~~;::'~ >~t~\
<br />
<br />,~.~.l--. .____.~_....~.
<br />
<br />lOWER QUARTILE
<br />
<br />:{l 10
<br />~
<br />~
<br />w
<br />"
<br />:;' 0
<br />20
<br />
<br />I
<br /> ~, .-
<br /> .
<br /> ..
<br />
<br /> '-
<br /> ..
<br />I
<br />I
<br />
<br />10
<br />
<br />o
<br />
<br />MOST ADVERSE
<br />
<br /> > <i <i ,. w ,. ~ >-' > '" '" ~ <i ,. w ,. "
<br />~ u z m z " . u z ~ .'
<br />u 0 w ~ ~ ~ . ~ ~ ~ ~ w U 0 ~ '\ ~ < . ~ ~ ~ ~ w
<br />C Z 0 w , . , ~ ~I 0 z 0 w ~ ~ ~ . ~ I
<br /> WuerVear1971 Water Ve.JIr 1972
<br /> 14
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