|
<br />~ I ,',
<br />l~._
<br />
<br />Table 2
<br />CAPACITY. ACTIVE STORAGE, AND STORAGE CHANGE
<br />OF MAJOR COLORADO RIVER BASIN RESERVOIRS
<br />DURING WATER YEAR 1971-72
<br />(Thousands of Acre.Feel!
<br />
<br /> .,kr".:
<br /> .",tung.: l.n.Jng.:
<br /> (;rtJ~" [',ubl.: .....:1'r <0, DUrin;
<br />lpp.:rH.NII (~I'J,,'j/.1 CJP.J..'''-'' /1),': '''Jr
<br />I~I..C' P...,,(.lJ :",Ol)O : \,OU~ 1 ~.4~~ -1.1:1
<br />Fbmmg(j"rgc J,7~'-' 1:4'-' ',.v.~ ...Q4
<br />;"':a,alo I ,~ll'I 1.6W, K<)~ _0,)\
<br />fl]uC';...lc'-l "" ~10 511 -:1
<br />Fon!C'ndlc- 14; 14; l4~ .1'
<br />;...lurru" PHlnl II" II" '" -,
<br />Suln"ral l.l.'-'U1 11.~N \-,I<:U _1\;'0,)
<br />l.vu.:rR.J..m
<br />Lah';...lC'aJ ~I<,' ,I ~ ~1\.1 '<J li,541 ...'/)5
<br />LakC' ;...1"hHC l.Illl( 1.1<10 1,4.0.4 _~i
<br />l.akC'IIH'''u M< "" 1M -10
<br />Suh,,,ul n.003 ~!(, ~K~ 1".41'ol ...qll
<br />Tula] Hmh H."n' 64.'01(14 60.Jr 1-,1)'1 -1"1
<br />
<br />Plate 4 shov.'s the combined active surface
<br />storage and capacity of Lake ~lcad and the
<br />Colorado Ri\"er Storage Project reservoirs for
<br />the period 1935-1972. It also shows [he de-
<br />cline of (Otal swrage in these reservoirs dur-
<br />ing the year. As Lake ~lohave and Lake
<br />
<br />PLATE 4
<br />COLORADO RIVER BASIN RESERVOIRS
<br />STORAGE AND CAPACITY
<br />
<br />~, -
<br />
<br />,,''''H' r ~_ '-'1'"
<br />.,'~~ ~~ I ~
<br />~"'JC I :
<br />....... ..... ~
<br />"'-""'~.,
<br />""""....-.....-.
<br />
<br /> ~.
<br />.
<br />. .".
<br />.
<br /> .,-
<br />, -,
<br />- ~.
<br /> ,
<br /> i
<br /> ". .
<br /> ,U
<br /> ,~
<br />
<br />.
<br />1
<br />
<br />
<br />"",,,to"'"',,,
<br />/-
<br />
<br />i
<br />~
<br />
<br />--
<br />
<br />....0 ,"""
<br />",:'r~ .[>1."
<br />
<br />...~
<br />
<br />,"1
<br />
<br />.
<br />,-
<br />
<br />,~"""""""","'"''''''
<br />
<br />12
<br />
<br />llavasu are operated with relatively little net
<br />storage change from year to year. the storage
<br />for these reservoirs is not included. Plate 5
<br />shows the ,'ariation in storage of the indi\"id-
<br />ual reservoirs throughout the water vear.
<br />The Bureau of R~c1amation has assumed
<br />that the amount of water that percolates into
<br />the areas adjacent to Lake Powell is not lost
<br />hU[ has gone into ground water storage or
<br />"bank storage". The Bureau has also assumed
<br />[hat bank storage is reversible. i.e., when the
<br />w;lter level at Lake Powell declines. most of
<br />the water held in hank swrage abO\'e the \Va.
<br />ter surface c1nation will return to the lake.
<br />Through the end of 1971, bank storage at
<br />Lake Powell was estimated to be 6.l'l million
<br />acre.feet. or 4H perCi..'nt of the total surface
<br />storage in Lake Powell. The 1972 year-end
<br />b.wk storage in Lake Powell was estimated to
<br />be 6.9 million acre. feet. representing .m in-
<br />crease in hank storage from 1971 of 100.000
<br />acre.fect, while Llh' PO\\"(,.'II declined in stor.
<br />age by over 1,100.000 .lCrc.feet during the
<br />year. Thesl' operating results may require
<br />that the .1ssumptions regarding b.101.: storage
<br />be revised.
<br />
<br />"'
<br />
<br />Water Uses
<br />
<br />Colorado Ri,'er Basin depletions in the
<br />l'pper Basin are cbssificd by the L~. S. Bu-
<br />re.w of Reclanl<1tion .IS inb.1sin consumptive
<br />llses. transbasin diH'rsions. .1Od rt'sen-oir
<br />e,'aporation. Irrigated agriculture is respon-
<br />sible for most of the inlusin consumptive
<br />uses. The quantity of these uses is estimated
<br />by applying unit \"ater use fat'tors to esti-
<br />mates of the land arC.1S heing irrigated. The
<br />Bure3u of Reclam.ltion estim.ltcs of Colorado
<br />River w.Her depletit>ns .1ho\"e Lt'e Fern' for
<br />the 19i! w.lter year arc:
<br />
<br />Inha..in Dl'pletl(lnS ,...................... ..................
<br />.. ran..h3..1O DI'er"lons ................ ...................
<br />l{e..('n,llr F\J.pnratwn ....................................
<br />
<br />:\cre.fe-et
<br />2.152.000
<br />620.000
<br />494.000
<br />
<br />3.266,000
<br />
<br />The estimated total depletion of 3.!66.000
<br /><lcrc-fect is 144,000 acre-fect greater than the
<br />depletions during the 19'i 1 water ye.H.
<br />
|