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<br />j:.j;,...;JJ
<br />
<br />Office uf River Contre! more fle.xibi'itv in
<br />scheduling and dispatching water.
<br />The Bureau of Reclamation maintains a "con-
<br />trol schedule" which includes the schcduled de-
<br />liveries to Mexico plus releases from storage for
<br />sluicing, river regulation and other purposes,
<br />Thc scheduled deliveries, control schcdules and
<br />excess deliveries to Mexico for recent years are
<br />shown in Table 5.
<br />
<br />Table 5
<br />
<br />DELIVERIES TO MEXICO
<br />(Thousands of Acre.feet)
<br />
<br /> Total
<br /> Sehdu[rd E.-utJs Exus!
<br /> Drtivuir! DttirrritJ 0",
<br />Wata to Control Flow to to Control
<br />J'{'O-r ,Mo:i({J Srhrdulr MrxjeQ _Uo:ico Sehrdulr
<br />1962______ 1,500 1,540 1,763 263 223
<br />1963 __ 1.500 1,873 2,1 Ll 613 240
<br />1964. _ 1,500 1,549 1,776 276 227
<br />1965. _ 1,4H 1,501 1,594 120 91
<br />1960__ _ 1,54\ 1,632 ),720 179 88
<br />
<br />Plate 7 shows deliveries to Mexico by years
<br />from 1951-1966 and Plate 8 shows the 'same
<br />information by days for the water year
<br />1965-66.
<br />
<br />Data Collection Programs
<br />
<br />Collection of accurate data on the flow of the
<br />river and its tributaries, and on the amounts of
<br />diversions and returns is necessary for planning
<br />of new water projects and managemcnt of
<br />eXlstmg projects,
<br />The Colorado River Board has encouraged
<br />the U.s. Geological Survey, Public Health
<br />Service, Bureau of Reclamation, International
<br />Boundary and \Vater Commission and others to
<br />expand their data collection programs and to
<br />make the data collected more readily available.
<br />The Chief Engineer, as a membcr 'of the U.S.
<br />Geological Survey Advisory Committee on
<br />\Vater Data for Public Use, conferred with the
<br />committee chairman and others on the need for
<br />more accurate and complete information regard-
<br />ing hydrologic problems in the Colorado River
<br />Basin. He also wrote to the Director of the
<br />Geological Survey detailing the nceds for addi-
<br />tional data in thc lowet Colorado River Basin.
<br />In a letter dated September 20, ]965, the Chair-
<br />man of the Advisory Committee on 'Vater
<br />Data for Public Use informcd him that in-
<br />creascd federal funds will permit a substantial
<br />
<br />26
<br />
<br />increase in the data program for the lower Colo-
<br />rado River Basin.
<br />
<br />Lower Basin Engineers' Joint
<br />Memorandum on Water Supply
<br />
<br />On August 13, ]965, representatives of Ari-
<br />zona, Nevada and California agreed on a mem-
<br />orandum on Colorado River 'Vater Supply
<br />which had previously been approved in sub-
<br />stance by resolution of the Board on August]],
<br />] 965, It was prepared at the request of the gov-
<br />ernors of the three states for the guidance of
<br />legislators in passing judgment on legislation to
<br />authorize a Lower Colorado River Basin Proj-
<br />ect. The joint memorandum was signed by \V.
<br />S. Gookin, State \Vater Engineer, Arizona In-
<br />terstate Stream Commission; I. P. Head, Admin-
<br />istrator, Colorado River Commission of Nevada;
<br />W. E. Steiner, Assistant Chief Engineer, Cali-
<br />fornia Department of 'Vater Resources; D. E.
<br />Cole, Chief Engineer, Colorado River Board
<br />of California; and 'V. D. Maughan, Regional
<br />Planning Stall Specialist, California Department
<br />of ,,vater Rcsources. It was presented to the
<br />House subcommittee on Irrigation and Reclalna-
<br />tion at the hearings on H.R. 4671 which com-
<br />menced on August 23, 196". The summary and
<br />conclusions of the joint memorandum are pre-
<br />sented below:
<br />
<br />"The water supply of the future caonot be pre-
<br />dic[ed with ansolute confidence, particularly in
<br />a stream of such widely fluctuating annual runoff
<br />as the Colorado River. \V c can only estimate fu-
<br />ture possibilities within reasonable hmi[s, based
<br />upon what has happened in the past. Risks arc
<br />inherenr in all such projections.
<br />"\Ve are unanimous in [he opinion that [he
<br />supply of [he river will be insufficient to meet
<br />future demands, estimated to reach about 18 mil-
<br />lion acre-feet per annum by year 2000, or to meet
<br />apportionments of use of \:vater made hy rhe Colo-
<br />rado River Compact to the Upper and Lower Ba-
<br />sins, and the Mexican Treaty burden. It is sim-
<br />ply :l question as to how long i[ will take the
<br />demands to surpass [he '\\-'atcr a\-'ailablc. Both ba-
<br />sins are ultima rely dependent upon substantial im-
<br />portations which should be made available by the
<br />laSt decade of the present century.
<br />"\Ve have concluded. however, that [here is a
<br />50-50 chaoce that the supply in the mainstream
<br />will equal or exceed the amount needed to pro-
<br />\'ide: (\) 4.4 million acre-feet a year for Cali-
<br />forniaj (2) WJter for decreed rights and e.xisting
<br />mainstream projects in Arizona and Nevada and
<br />the Southern Nevada \Vater Supply Project; 0)
<br />"'arer for increasing demands of the Upper Ba-
<br />
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