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<br />WE~TERN BQUNO.o.RY WATER BULLETIN 19~9 INTERNATIONAL BOUNDARY AND WATER COMMISSION
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<br />GENERAL HYDROLOGIC CONDITIONS FOR 1979
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<br />Colondo River
<br />
<br />Norlllillly, there Ls no lllea"Clrable amount of runoff f..olllh.. portion of Ulfl Color.clo Rive.. badn 1n the
<br />United St.ate.5 and l'Iex!oo below Hoover Dam, not including Bill 111111.. and GUa Hyers, There"''' no
<br />elgnlf10ant amount In 1979. Inthelowe.. ba",lnor the Colorado 1l1ver In i'lexloo, rr<:aPlordoa Olnr"lon D.. to
<br />the Gulf of CaU!ornla, the .verll.8ll pr-eclpitaUon during 1979 lIIeallured at 6 1nll... statiOi'll! wu ~.72 loeh.l,
<br />cOIllpared loan ave.-agecf 2.63 inch".. during the h.lt 21 yea.... (\959 to 1979).
<br />The now of the Colorado River rnchlng Imperl"l Ou 11118 6, 1,29.~OO Rore.reet, about 771 of the ~5-Je.r
<br />average (1935-1979) of 7,913,960 acre.reel. At thB northerly Int.r-n~tional bounder-y the tot.l rIOII of th
<br />r-Iver- durIng 1979.....'3,078,625 acr-e-teet, ~bout 89'S cr the 1935.1979 averasa of 3,~57, 107 acr-a_feet, It th
<br />eoutherly International bcundary, tnerIOIIdurlng 1979 was 916,712 acr-.-feet, or-about 36'S ofth.1935-1979
<br />average ot 2,548,489 acr-e-teet. Tne t.otlll now ot the ColoradO River- r-ellchillA the M. C. Rodl'illle:r. gaglll1
<br />station, 24.5 !DUn downstr-e;lJI rl"Olll tile 1I0uth.rly InUrnational bcunder-y .nd ~.5 !DUell Up,tr-OlOIIlI r~ the
<br />Scnora_Baja GalHornia ....llro~d bridge, WlI.S 840,573 1I0re-r..t in 1979, about 921 or the 1951-1979 averag. or
<br />91O,607aore-re.t.
<br />The total or ~ll now" or the CClorado River enter-lng Mexico In 1979 a.ounted to 3,345,418 aera.reet, 83'S
<br />or the 1935.1979 av.rage or 4,033,608 acre-reet, as IIf1l1sured 1) In the Color-ado Rlveratth.north.r-1y
<br />international boundary, 2) In the 1I.l11on_Mcha\lkMelnOutletOralnE>:tendon n.al"'Moralos Dam, 3) in the
<br />...ut...."ys that dlsoher-ge into the l1laitrophe ,ectlonor ther-ivel'" rr-OIO the UnH.dStatell bMk, 4) In th.ollll81
<br />...hlchdischar-geswa"Uanddr-ainage..ater-s rr-ollthe Tum"Pl"'ojectac,.css thellouth.r-ly landbounduy Into Mnioo
<br />near SM Lute, Al"'lzona, 5) elle,.genoy d.llver-y orCclOl"'ado River- ..atel'" rOl"'use In Tljuana, Baja Calirornia, and
<br />6) In the W.llton-Moha..k 6ypass Dr-~ln lit southel"ly land bounder-y near San Lulll, Ar-izonll.
<br />
<br />No rIoc1 pl!llk" or 1..IIIpo,.tanoe occu,.r-e<! In str-M.ll1I cf the 10\ler- Color-adO River- basin dur-lng 1979. A ..z!..mu..-
<br />inst~ntaneou, rIow or 9,680 ".cond-reflt oocur-r-.d In the Colorado Rlvflr- at the no,.thel"'ly boundar-y etatlon on
<br />AUIll"t 15, 1979.
<br />
<br />Stol"'ed wat.,.s at the end or the year-in the th,...majo,.,.esel"'volr-lIon theColo,.adoRlver-balOllLefl'af'lll'''y
<br />..ounted to 24,612,700 acre_reet, 87'S or the usable capacity or 28,568,400aol"'e-reflt. rile gr-...u,.p.l"'t
<br />(22,623,000 aCl"'e-reet) "r thfl ,tcr-age .., ccnUined In Lake Mead (lloo.fI,.Oall). Tn.,....er-lIno,..pol"'tlld
<br />ehortilJ!:"sorCO!Ol"'adoR1vel"'ror-lrrigationdur-lng 1979 due to drought 0 ,.accidenltothell"'r-lptlonll)'IIta..
<br />
<br />The total I"'epor-Ud ecreag. ir-r-lgat.d rro......ter-e ot tha Color-lido Rivel'" belowllllpel"'Jal 0..1'1 1979.....'
<br />',225,322 ac,.es; 680,956acl"'e" In the United Slates and:;44,366 aCl"'ell In Melico. Aneetwtad3UoracI"'Il.&e
<br />1'1 Mellool, ser-ved bYPullplng rl"'OIll ground water-.
<br />
<br />Th" ,ullpended lIedlment load pu.,lng the northel"ly boundar-y station In 1979 1IiI.lI 292. 7 ~cr-e_raat, about 130'S
<br />Or the 1956-1979 everllgflor 224.7 aCl"'e-reet.
<br />
<br />Tijuana River Ba.in
<br />
<br />Our-irlg 1979, the te",per-1I1ul"'." et Ba,.,.ett De.., Calitol"'nla (.l.vation 1,750feetllnthauppe,.por-tlonof
<br />the hasln In the Unit..:! Stat"s averag.d 62.4 deg,.ees, 1.2 degr-eee abov. the ~9.yeal'" lIlean. In thfl eztl"'l!IIe uppar-
<br />portion of the ba,in In Medco at San Juen de Olos, BaJaCalitol"'nla(el.v.tion3,280reetl,ther-"eordad
<br />te.peratures dur-lng the ye"r "ve,.aged 54 degr-ee", 2 deg,.ee" below tha 10ng_tel'.averal!fI; and at Rodl"'lr;u.:tDu,
<br />Baja Callfor-nl" (elevation 459 teet), the ,.aoorded tellper-atul"'e~ avel"'aged 64 d.g,.ee", 2 dagr-ees abov" the '101"'....1
<br />!Ol"'lIanyyear-,.
<br />
<br />At Ba,.rett Dall intheupper-port1onorthe basln in the UnitedStatas, the 1979 rilcor-ded pr-ecipltation.....s
<br />19.25 inch"." IllS or no....al; and at Chule Viata nflal'" tha 10"'1'" and or the ba~ln, 10.13 Inches, or- 106'S or
<br />'10,...1. The ,.ecol"'ded pr-flclpltatlon ~t S8n Juan de Olo~ 1'1 the UPPfll'" pOl"'tlOn or the basin in Mezico, ..., 19.25
<br />Jnohas, appf'Oxl.llately 123S or the no"",,"l dur-Ing thfl 24_year- pe,.iod; ~nd at ~odr-lgu'Z DlIlII In th" 10lle,. por-tion
<br />-:lr the bll~ln in MeXICO 7.95 inches, 951 or the 42_yaar aver-age.
<br />
<br />Runoff In the basin du,.lng 1179a.el"'agad.ol"'e than 3161 or '10""'1. AbovaHor-enaRas"l"'voirthal"'unorr..as
<br />20,631 acl"'''_ reel., or- about 3591 of the ~3-y"ar 1937-1979 llean or 5,7:;1 ac,.,,_reet. At Rod,.l,;ue:t Rnal"'volr, tt>.
<br />l"'unorrwa,43,32Qacr..feet, Or-lIboClt29910rthe 42_year-munor 14,:;00acr,,_feet.
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<br />The tlO\/ortheT1Juana River at the Inte,.natIonlll boundary...s 52,76411 cre_raatdurlllAI979,andth"tlow
<br />In the Tljuana Rlv.1'" neIll"'Neetor..a, 40,113 ao,...r.et,
<br />
<br />While water Draw
<br />
<br />Dur1r1g 1979, the average annull1 temp"r-atul"'a over- the wate,.,hed IIII~ "lightly belOll nor-1liiI, whlla tha annual
<br />p,.eclpltat1on .."" below nO....lll. Runort ror th. yeu at th. gagIng statIon n.al'" DOU4las, Ar-Ilona or 3,226
<br />ac....._feat.."sabout4910faverage.
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