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<br />nOOOS2
<br />
<br />WATER SUPPLY FOR THE SAN JUAN-CHAMA PROJECT
<br />
<br />7
<br />
<br />ADEQUACY dF WATER SUPPLY IN THE SAN JUAN BASIN
<br />
<br />The second part of my study' involves the question of whether the
<br />long-time flows physically avaIlable in the San Juan Basin are suffi~
<br />dent, with the regulation from storage in the Navajo Reservoir, to
<br />supply the water requirements of existing developments in the basin,
<br />the requirements of potential developments in Colorado including the
<br />Animas-La Plata project, the requirements of the proposed Navajo
<br />and San Juan-Chama projects, and the foreseeable water needs down-
<br />stream from the Navajo Reservoir. Also involved is the determina-
<br />tion as to whether the proposed uses in New Mexico are within New
<br />Mexico's expected entitlement to water.
<br />The basis for all the hydrologic studies of the San Juan Basin is
<br />the records of historic flow. The three points of measurement most
<br />important from the standpoint of the projects under consideration
<br />and the diversion of SanJuan Basin water between Colorado and
<br />New Mexico are on the San Juan River at Blanco, on the Animas
<br />River at the Tefts diversion site and on the San Juan River at
<br />Farmington below the confluence of the Animas River. The long-
<br />tiille historic flow at these three points is shown in the following
<br />tabulation:
<br />Flows at Farmington, N. Mex.
<br />The long-time historic flow at the Farmington gage, located below the con-
<br />fluence of the Animas, is about 1,900,000 acre-feet. The following table shows
<br />recorded and estimated flows of the San Juan River at Blanco, Animas River
<br />at Tefts diversion site and San Juan River at Blanco.
<br />
<br />Historic flows
<br />[1,000 acre-feet] _
<br />
<br /> San Atrlmas San San Animas San
<br /> Juan River Juan Juan River Juan
<br />Year ending Sept. 30- River at Tefts River Year ending Sept. 30- River at TeCts River
<br /> at diver- at at diver- at.
<br /> Blanco sion Farm- Blanco sion Farm-
<br /> site ington site Ington
<br />
<br />1913_._____._________.__ ________ __n_____
<br />1914___~.__~_____________ 11,440 .________
<br />1911i_____________________ 11,705 .___.____
<br />1916_____________________ 1},890 .________
<br />1917__m'___________:___ 11.990 n.._____
<br />1918_______.___"._____.. 1785 nm_...
<br />1919--__________________. 11,240 ___n__n
<br />192Om.___________.n___ '2,275 _________
<br />1921-____________________ 11,5.25 .____u._
<br />
<br />1922_____________________ 11, 380 _~_~__~__
<br />1923________~_..__________ 11,205 _~_______
<br />1924__________h______~___ 11,200 _________
<br />1925--.__________n______ 1855 _________
<br />1926___hh__________h_____ 11,045 _________
<br />1927--______.____________ 11,710 ____nn_
<br />1928______m_m_____m 860 '394
<br />1929__________________~__ 1,514 21575
<br />1930.n________________u 886 '388
<br />1931--,,___u___m__n__ 550 '236
<br />193L.____u______mn_ 1,860 '525
<br />1933--______________.____ 696 '337
<br />1934--____mu__________ 355 '.172
<br />1935-.n.___n______n.__ 1,504 '.436
<br />1936m__________u______ 934 '366
<br />1937--___nn__n________ 1,408 l' 381
<br />1938m..___"________u' 1,435 '520
<br />1939,__u__________nn_~ 729 '298
<br />
<br />1,61)0
<br />2,600
<br />2,600
<br />2,930
<br />3,290
<br />1,410
<br />2,180
<br />3,700
<br />2,730
<br />2,530
<br />. 2,057
<br />1,855
<br />1,572
<br />2,019
<br />2,962
<br />1,534
<br />2,617
<br />1/537
<br />908
<br />3,010
<br />1,200
<br />630
<br />2,296
<br />1,513
<br />2,110
<br />2,412
<br />1,257
<br />
<br />1940n________n_______._ 009
<br />194Ln____________m___ 2,351
<br />194Ln_______n________ 1,652
<br />1943m______________".w 737
<br />I944_________~___~...._____ 1,235
<br />I940mm__mnn.__m 868
<br />1946--____mm.________ 392
<br />1947--_____u___um____ 567
<br />1948m_____nnn______. 1,267
<br />1949_m_____n____.___u 1,389
<br />1950__._.n___n_________ 535
<br />1951--______________,,_n 331
<br />1952_n_.u______________ 1,490
<br />1953m____n__m______. 6le
<br />1954mm..um________ 514
<br />1955-._________m_______ '48S
<br />1956--______________n___ '492
<br />1957--______n___mwn '1,432
<br />1958--________________w 31,389
<br />1959mnnn_n_n______ . 308
<br />1960__n~__~_h___d______ -31,024
<br />
<br />Average for period of
<br />recordu_________u___ -1,119
<br />
<br />Number of yev.rs of
<br />record___uu__________ 47
<br />
<br />2270 885
<br />, 725 3,659
<br />, 524 2,707
<br />2393 1,304
<br />, 553 2,069
<br />2404 1,416
<br />, 334 790
<br />, 490 1,299
<br />, 528 2,133
<br />. '514 2,239
<br />, 290 942
<br />, 275 651
<br />, 576 2,401
<br />--------- 842
<br />--------- 897
<br />--------- 915
<br />--------- 874
<br />--------- 2,438
<br />--------- 2,363
<br />--------- 610
<br />-----------------
<br />, 420 1,883
<br />, 25 47
<br />
<br />1 Estimates by Engineering Advsory Committee, Upper Colorado River Commission.
<br />:1 From 1954 status report. Flows for year, ending October 1931.
<br />3 San Juan River near Archuleta minus diversions by Citizens Ditch (diversions estimated after June
<br />1958). .
<br />NOT-B.-Except where marked, annual totals from USGS water supply papers.
<br />
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