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4 CRBSCP, Proteclive and Regulatory Pumping Unil t.,:> o --1 ttl regulatory ground-water pumping in November 1974. Presented in this report were alternative plans for a proteclive and regulatory ground-water pumping field, which set the framework for development of the Protective and Regulatory Pumping Unit. Authorization The unit was authorized by the Colorado River Basin Salinity Control Act, Tille I, of June 24, 1974 (88 Stal. 266), Public Law 93-320. Seclion 103 (a) of the Act authorized the- Serretary of the Department of the Interior (consistent with Minute No. 242) to construct, operate, and maintain well fields capable of furnishing about 160,000 acre-feet of water per year for use in the United Slales and for delivery to Mexico in satisfaction of the 1944 Mexican Water Treaty. The Act also es- tablished a S-milc protective pumping zone along the Southerly International Boundary. Construction Construction of the unit features began in 1977. In. stallation of the access road and the 242 Lateral. along ",,'ith construction of 14 wells and associated features. was completed in 1978. By 1983, a lotal of 21 wells had Lecn completed. Completion oC the remaining wells has been deferred until after the high surplus flows that began in 1983 have receded and until the wells are needed to help met the treaty obligations. Operating Agency All unit works are operated aod maintained by the Bureau of Reclamation. BENEFITS Social and poBticaJ benefits accrue that are outside the normal realm of economic quantification; however, the Protective and Regulatory Pumping Unit will use the United States ground-water resources in the Yuma area for the benefit of the United States and will prol'ide water deliveries to Mexico. thereby conserving upstream Colorado River water. PROJECT DATA Facilities WellB .................................. 242 Lateral. . . . . . . . . . . . . . . . . . . . . . . . . . . . AC('el!Ill' road............................. Transmillsion line. 34.5 k. V ............... TranBmiBllioh line. 69 k.V (WAPA)......... 21 12,4 m; 12 nli 11.7 m; 18 m; Climatic Conditions Anoual precipitation..................... Temperature: Maximum 119691. ...... ,.."...',...',.. Minimum \19681..."..,...."..."...". Mean .................................. ENGINEERING DATA Water Supply Ground water is supplied from wells. On the Yuma Mesa. there iB no surface drainage. The portion of the Colorado River water supply that is not used consumptively per- colates into the ground.water reservoir. Sediment Retention Facilities Two settling basins provide storage for the accumulation of sediment. Carriage Facilities 242 LATERAL Location: SI.art.8 near weU No. 22 and extends 12.4 mi west along the Southerly Interna- tioDal Boundary to the allerbsy of the ex- isting Yuma Project's Boundary Pumping Plant near San Luis, Ariz.. Construction period: 1917-78 Length ...,." ,.'".."..' ,...,.., ,...', Open channel........................... Pipeline..... ....... .............. ...... Capacity'......... ....... .... ........... Typicol section (open channell: BOllomwidthlvariesl............... ...... Side slopes.............................. Water depth Ivanesl . . . . . . . . . . . . . . . . . . . . . . Lining. conerete . . . . . . . . . . . . . . . . . . . . . . . . . Typical section (pi~linel: Type: Reinforced ooncrete Length ...,..' ,.', ,.."..'" ..',.""... Size: MaxUnum ....................... ....... MinimUIll ............ ............... '" WEI.L FIEUl Location: On South Yuma Mella. north of the Soulherly Inlernalional Boundary. l.omlruction pt'Tiod: 1977.83 Number of wells ........................ I)epth................................. . Diameter of well at surfa{'e............... Total annual production ............ Ptl~Il'IN(; lJNIT~ 3 in 109 OF 32 OF 71 OF 12.4 mi 6 mi 6,4 mi 7.5 - 220 ft~/s 4-6 It 1..\,] 2.8 - 5.8 It 2.5 in 6.4 lOi 72 in 27 in 21 600 ft 10-26 in 125.000 acrewft Dellignation Nominal design Number capacity. of unitll! fills Tollll dynamic head. r. Horse- power Well pump units 21 7.5 128.145 125-250 ISlarting at ......ell No. 22. the 242 Lateral will increase in capacity by increments of 7.5 h3/a all it adds the OUlput from each of the wells along the l"Ourse. 2rourteen additional wellll may be added when peakin~ conditiol1B require more water or l'Ommitmenta are l'hangerl.