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<br /> <br />Colorado River Basin Saltmtv Control Program <br /> <br />n <br />On <br />....1 <br /> <br />The PRPU was de....~]oped (0 intercept part of the groundwater underflow that mo.....es southward <br />from the Yuma \1esa in the UntIed Stales into \.fexico_ Before Ihe PRPU w.as construcled. this <br />underllow was Increasing because of groundwater pumping In Ihe Sonora Mesa Well Fie]d. <br />immediately south of the Southerly International Boundary in \.1exico and localed near San Luis. <br />~h:\ICO. The Basin States expressed theIr concern aboul {he pumping in Iheir July 1973 leller (0 <br />the President of the Unt[ed Slates. <br /> <br />-.,: <br /> <br />Currently, ~ I of the 35 wells in the planned full complement of wells and associated con.....eyance <br />and energy faci]nies ha....e been conslructed. The wells are connected by a 15.3-ml]e pipeline and <br />open concrete-lined canallhal carries Water by gra.....lty across [0 the Yuma Valley \1ain Drain <br />\lohere it crosses the Southerly International Boundary. <br /> <br />\\"uh 35 \loells, the PRPU would ~e capable of prodUCIng aboul 1'::5,000 acre-feet of water per <br />~ear UltImately. 1'::5.000 acre-feet of water from Ihe PRPU. combined wllh 15,000 acre-feet of <br />\loaler from the East and West \fain Canal v,,"asleways 10 the Yuma Valley. would furnish <br />]-10.000 acre-feel of \1exico.s I 5.mtlllon-acre-foot annual entlllement The water would be <br />dell.....ered althe Southerly International Boundary near San LUIS. Arizona. In addilion. <br />35.000 acre-feet could be withdrawn by pri....ate wells and/or \.1inute ~o. 2-12 wells for use on <br />pm-ale land to equal the 160,000 acre.foot limit for pumping In the 5-mile zone. Currently. Water <br />from lhe East and West \1aln Canal Wasteways and Ihe Yuma Valley \1ain Drain exceed <br />]00.000 af'Yr dell....ered to the Southerly International Boundary <br /> <br />Should these wasteway and drain llo\los diminish In the future. wells will be added (0 the PRPU. as <br />needed. to ensure that appro,w;imately J-10.000 acre-feel can be deli....'ered atlhe Souther]) <br />{mernauona] Boundary at all times. <br /> <br />AddllJOnally. as authomeJ by Tit]e I. approxImately 23.500 acres of privale. Stale. and State- <br />leased lands ha.....e been acqUIred within the 5-mile zone. The purpose of these acquisilions IS to <br />Imll! de....elopment and. thus. IImH UnJled Stales groundwater pumping to 160.000 af/yr. as <br />reqUIred by ~1lnute So 2-1~ The acquisllions were completed 10 198-1. <br /> <br />Yuma Desalting Plant <br /> <br />The Yuma Desa]tlng Plant was built on a 6O-acre tract of land 6 miles west of Yuma. Arizona. <br />The purpose of the plant IS 10 Improve the qua illY of Irrigation drainage Water from Ihe W\1IDD so <br />that 11 can ~e rerurned to the Colorado Ri....er and dell.....ered to :-'1e.w;ico in partial satlsfaclion of the <br />.\le:dcan Water Treaty of 19.u <br /> <br />The operatIonal design parameters set up for the plant detennined that a re.....erse osmosis membrane <br />desalting process was technically feasible and suilab]e for the Yuma Desalting Plant operation. The <br />factors utilized in the plant design were projected .....olume and salinity of Water 10 be delivered to <br />:-'lexico at :-':orthern International Boundary. the salinity dIfferential required by Minule No. 2-12. <br />the projected salmJlY of the Colorado River at Imperial Dam. the .....olume of W\.lIDD drainage <br /> <br />2' <br />