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<br />'" W[STERN BOUND...IIY SUMMAR! WMER 8ULLETIN-I'1}(j 1'?'j'l-I~IHP_N"'TlorJ"'L [lCu~m...p_y "'ND w"'TEII COMMISSI()N <br /> <br />FOREWORD <br /> <br />... <br />Stream gagmg on rhe Colorado River below lmperlaiOam began In 1902 when the ~tatlon Ht Yuma. "rtlOna wa~ ~s- <br />,abllshed. Stage recordH have been ob1:alned at. rhis st.lllon ~mce januar\' IS78. ContInuous ~tream gaging on the TiJu.l.na <br />RIver and LtS lmpOrtallt trltlutanes in the Un,ted States and Me~lco began m 1936. The I'~H Water Tr....ly between the <br />Un1t~d Slate~ and M~l(o alloued \') the twO countries the W.l.ter~ of the Colorado R.lver and implememed the srream gaging <br />program. ArTl..:le 12(d) of the Trearv pro"\des. <br /> <br />"The Commls51on shall conslnJct, operate and matntaln In The l1mitrophe sectlon of the Colorado ftJver and <br />e",ch SectIon shall constru<.:t, operale and m,untaln In the territor.. of It~ own counnl. on the ColoIhdo River <br />below lmpenal Dam and On all ocher carrymg facilitIes used for the delivery or water to Me~Lco, all necessary <br />j:;aglng sta!1ons and other measunng devices (or lhe purpose or keeptng a complete record 01 the Water~ de- <br />IL"ered to Mcoxico and of th", f1ov,s at the nl.cor. Ail data otKa,ned ~5 (0 5u<.:h .:Jel,verre.li an~ .'b".1I51:IIJ~ ~ <br />perL')dKdllycomplledandex>::hangedhe~'eenthetwOSeet\Ons." <br /> <br />TIllS speCIal bulletin cOntaln~ summaries by momhs ;md ~ears of Ihe records of flow 01 the Colorado R,,,er and OIher <br />wcstern boundar;' strums End related daw lor the period 19~(l lhrough 1950. Fragmentar~ records for those 5tallOn5 <br />opec..lfroToTC'nJyshC'npenods oftomcare Elsa reponedh..r",n. <br /> <br />The wt,11 llralnaSe area wlrtlln Ihe Cl)lond.:> River b~s'n IS 140,000 square miles. Re~er"olrH 1II1he b:islll ha"e a <br />total usable c3pacll~ uT apprO.\lmMelv 29,6j(l,2UO acre.feet. <br /> <br />The total dralllajj"e area of the TIJuana RJ,er ba~1n IS 1,731 square miles of whIch 27 percent lies In the United Slates <br />~nd 73 per<.:ent III MeXICO. Reserv')lr" In the baSin h~.e a total storage eapacll~ of 206,~511 aen'-feE-t. <br /> <br />The dralllage ",r"3 of Whltl'Water Draw baSin above the Ouuglasga,;png station IS 1,023 llO,uare molell. The dralllotge <br />nc~ of thc Santa Cruz River above the Nogales gag1ng station IS 533 square mtles of whIch 349 llquare miles he In Me~lco <br />and th~ drama,,'" area OJI the Z;~n Pedru RivC:T obOJve PJlnn1HlBs. AIIzona, I:> 7~ f 5qu~re mll~s uf which 649 square miles lie <br />[nMe.,;c.'. <br /> <br />Acknowledgment. <br /> <br />Oth"r agencIes which hav" Cl)ntnbUled to the' data publtshcod hereln tnclude the Bur"au 01 ReclamalJelll and th" Geo- <br />\ogl":.l1 Survey 01 th" U. s. ~parOnent or the IntL!rlor. the Yuma County Water U~"rs' AllWCtatLun. lhe Impt:rtal lrIlgation <br />DtSlIlet. the ctt~.:If San Dtego, Cal1fClfLll... th" Call1ornia Water and T"l"pilune Company: amI thl! Mmtstr.. of H~draullc Re'- <br />suureesofMe'xtco. <br /> <br />The courte~y and cooperallon of thOIl" who have made these contnbUllons an' acknoJwl"dg<:d With uur apl'l'e<':lJllloJn. <br /> <br />Unit. of Measure <br /> <br />Records 01 stream flo.... colleeled by the. MeXIcan s<:'ction aT" '"11l..11!, compule<.l in meulC unus, but are reported 111 <br />!hIS /X;~leIL"I JJI e:;wv.1Jenl Eng!J,,-lJ unUs. Olnv"T~LOn 01 th" monthly v'llumes [rolT, melrtC to Engltsh unitS IS dtreel. Thco <br />monthly '.olumes 01 Stream flow In cubte metl<rs aT'" converTeu to Jete-teet by lllulllplYUlll thousands 01 ~Ubl<': Lnl!t"n by <br />O.~ 1071. <br />