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<br />2201
<br />
<br />In addition to the users listed on Table 4, mis-
<br />cellaneous users divert from the Colorado River
<br />or pump from wells adjacent to the mainstream.
<br />Gross diversions of these miscellaneous users in
<br />California, Atizona and Nevada are estimated to
<br />have amounted to more than 100,000 acre-feet
<br />a year for the past several years.
<br />On November 14, 1968, the Secretary of the
<br />Interior entered into three contracts for deliv-
<br />ery of Colorado River water to Arizona entities.
<br />The contractors and quantities involved are: the
<br />City of Kingman for future diversions of 18,500
<br />acre-feet per year; Lake Havasu Irrigation and
<br />Drainage District fot 14,500 acre-feet per year
<br />of groundwater pumpage; and Mohave Valley
<br />
<br />PLATE 7
<br />
<br />LOWER COLORADO RIVER
<br />AND
<br />AGRICULTURAL AREAS
<br />
<br />11O'f HaUI"fO'O. .....t. CAli "[L.usn
<br />rO.EACM,
<br />
<br />I~.."., O...-J....
<br />
<br />\
<br />
<br />c..,''''o V."" -~ ,., ....
<br />
<br />..""..-.......0........0"....,"'-..."
<br />
<br />v....v.".,.............o.......-.,......
<br />
<br />,"'...,,,v.,,,,_..,s"',,
<br />
<br />II
<br />
<br />
<br />,,"'"'''' u~.,
<br />/
<br />
<br />,,,,..,,,r:;:',
<br />.'"'' ''-:"'" "-=
<br />V
<br />
<br />.....".'
<br />V,"..
<br />
<br />."....."..,...,
<br />
<br />C..~lr~'!'-_.
<br />\I\:IICO
<br />
<br />~
<br />
<br />---
<br />
<br />'~
<br />'~I(O
<br />"~.l"i~
<br />
<br />, ., ,.
<br />
<br />'""""'""
<br />
<br />Irrigation and Drainage District for 15 ,000 acre~
<br />feet per year of groundwater pumpage.
<br />The llureau of Reclamation releases water at
<br />Hoover Dam to satisfy requirements for the
<br />Mexican Water Treaty and sixteen separate
<br />agencies in the United States; thirteen of the
<br />agencies are served by diversions at Imperial
<br />Dam. The nearest major regulating structure to
<br />Imperial Dam is Parker Dam, located 148 miles
<br />upstream and three days' flow time from Im-
<br />perial Dam. Senator 'Vash Dam completed in
<br />1966 on a tributary upstream from Imperial Dam
<br />provides for a limited but valuable amount of ad-
<br />ditional regulation. The ordered flow at Imperial
<br />Dam is seldom rhe precise rate actually required
<br />owing to changes in the weather and other fac-
<br />tors during the travel rime from Parker Dam.
<br />The storage provided at Senator Wash is used
<br />to balance, insofar as possible, river flows with
<br />requirements. Plate 7 shows the periods of time
<br />required for Parker Dam releases to reach vari-
<br />ous agricultural areas.
<br />
<br />Deliveries to Mexico. The Bureau of Recla-
<br />mation maintains a "control schedule" which
<br />includes the scheduled deliveries to Mexico plus
<br />releases from storage for sluicing, river regula-
<br />tion and other purposes. The scheduled deliv-
<br />eries, control schedules and excess deliveries to
<br />Mexico for recent years are shown in Table 5.
<br />
<br />Tobie 5
<br />DELIVERIES TO MEXICO
<br />{Thousands of Acre-feet)
<br />
<br /> Total
<br /> Scntdu/td E:cas.r Excus
<br /> Dr/it.uitJ Dt/ifJtritJ 0,,,
<br />Waftr to Control FLow to to ControL
<br />Yt"ar .~!txjco. SchtduLt A-ft"xico Mt:!:t"co Schtdule
<br />1962u.-.. 1,500 1,540 1,763 263 223
<br />1963__uu 1,500 1,873 2,113 613 240
<br />t964hUU 1.500 1,549 1.776 276 227
<br />1965.u.u 1.474 1,502 1.594 120 92
<br />1966uu_. 1,541 1,632 1,720 179 88
<br />1967uuu 1,459 1,517 1,566 107 49
<br />1968_ _ uU 1.488 1.541 1,563 75 22
<br />
<br />. The wa.u:r yC3.r taUI a{ 5chcduled dc\ivctLe.. i.. not ncccuatily the. l,SOO,tm
<br />acre-foot calendar year obligation undcr the Mexican WOlter Treaty.
<br />
<br />Plate 8 shows dehveries to Mexico by years
<br />from 1951 through 1968, and Plate 9 shows the
<br />same information by days for the water year
<br />1967-68. The continued improvement in river
<br />control can be judged by comparison of the total
<br />excess deliveries to Mexico over the control
<br />schedule the past few years, as shown in T a-
<br />ble 5.
<br />
<br />27
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