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<br />....:ESTEPr. 80u~m.'V( WAT[~ llL.ILL[1IN l'ii6. 1I.II[RlgrlCr!~L ~Gu~JD'~.' ;~'D \\' IE~ CC,MMI:.~10"
<br />
<br />GENERAL HYDROLOGIC CONDITIONS FOR 1976
<br />
<br />Colorado River
<br />
<br />NOrDllJ, there 15 no ~!t6u.....Lle B.m:>unt of ru"off from the IJJrtlorl of the Co1onld.o River b""lrl in the
<br />Un.1ted State" an.d Ml!dco bel"" H"over DB1Il, not 1n<:lud1ng BJll Wlll1lllllZ II11d GU" Riven. There "'L~ "0 ~Ignl_
<br />1'ICII11t BJaOUnt in 1976. The ave1>l€J' "e8-so""l (O~t.ober 1915-Sept~er 1976) r"l,uB-.ll -:lVer t.he urp~r bB61", ""
<br />l!jII.lI..d Ilt 1) index st.&l1on:;, vns flboo!. 11.1 11,ches cOlllpued to" sea~olVll "v..rage of abo~t 1).c.5 Iu~hes for
<br />t.h.. 54 6eBSOru; (1?2)-1',176). In the low..r oo6in o! the Col'lrtldo River in ~:i<I~o. from /ot:lrelo~ Dlverslon Dam to
<br />t.heaulfofCal1!ornlfl,theBver'8&e precip1lal1on(1976)m..fl5Uredo.tolndexst!ttJonsw"s5.2.'3ineh..scOIIIrnred.
<br />!J;) B-rl aveme;c or 2.60 in~he" during th~ inst 18 ;!eW"~ (195<;l-1976).
<br />
<br />Th.. flow of th.. Co1om.do Riv~r ""..dling lml"'r1B-.l DIUII W"5 5.902.)00 ll~re-fe..t.. about 7]'it of t.he 42_y..,,-,"
<br />flve....se (19)5--1976) or8,0J1,795 B-.Lre_r..et.. At the northerly Interne.l1ol1fll baulldarJ, thet.otal flow Of the
<br />riverdurin;;1?7ti""F 1.449,516 aCI". f....t , about 41'tor the 19)J.1916 av.......ge of).Jo1,062ocre-fe..t. At the
<br />60utherly Int..rnll.tIonB-l bourrln.ry, tn.. fl()ll d'Jr1ng 1916 lIa6167,216 aer.._!....t, orllbout 7% of t.he 19)5-1976
<br />IIv..nog.. of 2,7Q1. ,)51 aCI'O!_reet.. The tottll flov or th.. Colol"',do RJv..r reflehing th.. M.. C. Rodri6U~";; gaging st....
<br />tIun, 24.J lD.11es d.ownstrefl..lll !ro.. the southerly int.ernDtlonal ~ounl1l1r.l, and 4.J mil..s ul"'treB-.lll from th~ Sonora-
<br />IleJB CBlIfornis rtlllroB.d br1I1~, ...as o(J,230 acr,,_f..et in 1976, ~bout 9% of the 1<lJl.1976 ave""'g~ or 982,."82
<br />sere_feet.
<br />
<br />The tol.fll of all flow" of the Co10......do Riv..r ent..rl"8 Hexi~o in 1970 llJWu"ted to 1,774,224 IIcr....r....t., 4)%
<br />of the 1935-1916 avel"B.ll" or 4 ,15.:1 ,,}93 e.'re_feet, as "'~asured 1) ill the Colorado PJ.ver at the north..rly lot..rns..
<br />t1o[]I.Ll t.our,d,ary, 2) in thP. Wel1to,..K:lro"'l\ HBln Outl..t Dmi" Ext..nslon new- ItJrelos Dem, 3} In the Vf'-~tev'V"s
<br />that dJ6ctIIl1L:e Into th~ 11l1l1troph" sectJon of th.. riv..r from th.. Unlt..d St...t..s l>o1nk, 4) in the c!li\E1l which
<br />dJscllflrg..s VlI"t,., !o-nd <l.J-qlnf'-ge "",ten from th.. YWIIn f'roJeLt IIcros~ the southerly l..nd boul1<lnr. int-:l Hexl~o n..ar
<br />SB-1l l.u15, Arizul1ll, and 5) emerg..ncy .jelJverj of ColoI'O!Qo River lIato::r for us.. In TiJu.lIn.~, !lBJ!t (;B1I fomie.
<br />
<br />Ho no~d I"'B.Ks of imp:lrtance o~L;u1Te.J in 1\tr"",-,"-" of th.. l"",er C010.....do Ely..r ~f'-~in duri"8 1016. A """).):1.
<br />mWll 1""U.nta""~us [1"" or 8,9)0 ~""olld-f....t OCC\J1T"d. in the Colortl.Jo River ...t the northerly boundary "letion On
<br />S..pt..mber27,1976.
<br />
<br />St.ored....te:nl Ilt the elld of the ye"rlllth..t.hreelllBjOr reaervolnollth..C"lo....do Riv..r b..l"", u,..'s
<br />F..rry llJIVIJnted to 2),411;l.500 Ilcre_reet., 8~01 th.. usabl.. CB.\.Uclt.y Of 28,5&3,400 a~re_f..et. Th.. gr"llter p'rl
<br />(21,20),000 acI'O!_r..et) ~r th.. :;.tOTllge "'as ~onte1n..d. 1n Lak.. Me-"d (Hoove,. DB-Ill). There .....re nO r..>Orted short-
<br />el!i"" of Colol"fld.o Riv..r \lBter for irrigatioll c1ur1ng 1976 due t.o dI'Q.lght Or accld..nt to th.. Irrigat.ion system.
<br />
<br />Th.. totlll re>orted IICI'O!D~ irrJg:<t..11 from wat..rs of th.. Colorndo Riv..r bdOlo/ Imp,ria1 DWll In 1';7611"5
<br />1,100,87) aCI'O!5; 68'},250 "cre~ 1n the United Stilt.." IInd 50).62) acr..~ in """xi~o. tv. ..sti_ted )4%of ..cr..age
<br />1n Mexico Is <..",..01 by IJ-il'lp1na l";roJIl gr<Jur.d. IIDter.
<br />
<br />Th.. 6u'Jl'!Med "..d1ment. lo"d p:l5s1ng th.. nurth..rly bounder;. ~tation In 1976 \o/B3 71.0 acre.f....t. IIbout )0%
<br />o[th..195t...1976Bve.....gJ:o(2)6acre-r..et.
<br />
<br />Tijuana River Ruin
<br />
<br />During 1976. the t.elll>e....tur..s u.t Barr..tt D"--'ll, CB-lll'orn1a (..l~VDtlon 1,750 feet) In the upper >ortJon of
<br />th.. bllstn in the IJn1ted St..t..~ tlv..ro;gJ:.J 60. 7 deg:n:..~, 0.5 degree below the 46-yehr llIean. In the ey.treme upP"r
<br />p:lrt1on o! th.. basin iI, JoIo::dco flt :;;an JUfln d.. D106, BhJh CBl1forn1t1 (el..vet.loll 3,230 f..~tJ, the r..~orded t......
<br />].'CI'hturell .:tu,.lo.g the y~8.r hV":n'IgeJ 54 deilrees, 2 degree;:; telO"J th.. lon6-tel"lll l1\'erJge; and!L.t 1'-:l1r1gu~z D"-"',
<br />llltJ& CallforrJ.h (el~vat1on 4,}9 f..~t.l. the recorded te"~rntures IIveraged 64 degre..s, 2 d"gr1!~s f'-b.)ve the 1IV1"III3.l
<br />ofmen,yyears.
<br />
<br />At. Ba~tt DBlD in th.. upper plrt.lon of th.. basin In the Unae,t Stllt..~. the recorded prec1pltat1onll~s
<br />11.1Y,i Inche~, 10d,tof nOnlll; &nd!tt Ch',la Vi~Ul- nehr the l""er ..nd of t.h.. b9~ln, 11.7<:' In~hes, Or 125%01' lIVr_
<br />1181. The record..d pre~ipitetlo.1. at 5a.Jl JU8n 01.. Dlo~ In the upp.!r p.Jrt1on o! the b,,~ln In Mexi~o 'J~. 16.65
<br />inehe", Ilpprod__....tely 116%0! the n"/'mll durIng th.. 21_y~"r period; end et Po1rlguez uB-lll In the 1""..1" I-L'rtLon of
<br />th~ basln 1n Mexlco. 14.E'L in"hl:s, 1S4'X, -:If the )<l..:,..er everege.
<br />
<br />!>wlUrf in the b~~i" duril'''' 1970 .Jver.,,;ed lo::~s lh,," 15% 0;. Ilomll Atu.,.. !-b'.CIl" Pe.erv;Jlr th.. rurlOff "'~~
<br />406 ~c:r.._fe..t or "t.o~t 13% of the 40.'''',r 1'/37_1076 llIe"" :>f 5 272 ".:r.._f....t At RO",igue" !l~: en'Oir the
<br />rUl"'[; w,'. 2.~02 "..re_r....t or ,,!Jout 2,110 uf the )(l_)'~Sr ~~"" or' 12,33~, ""r...r...,.t.
<br />
<br />The flJJ or th.. TIJu~~ Rlv.,.r lit th.. Illtenlatioml boun.;JorJ II"" 1,a1') u~r.._fe~t durlrl3 1176, nn<l th~ 1'10'"
<br />in th.. TiJuh"-' River n..hr Nest..;,r "~5 674 ..cre_!....t.
<br />
<br />.'
<br />
<br />Whitewater Drllw
<br />
<br />Durl'"", 1076, t.h.. IIV~I'h~ !Ul.nulll t"lII~l"'",t'Jre "v~r the "Bter~h..d ..."~ "l1o;htlJ bel"" nof"tllB.1. IIM1.. th..
<br />srlflu.e.l pr~~lp1vlt1on \/"" ~bout norllJl-l. Punofl' fur the year ht the f!l;gi.ng et~tion ne',r D~~glB5. Ari;.oM "f
<br />2,)Cti' aCI'O!_fe~t "at Bbout )4% or hVel'hge.
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