WSP01617 - Laserfiche WebLink

Home Browse Search

2 CRBSCP, Proleclive and Regulalory Pumping Unil t,,) o ~ -..l COlOlACO IIYII ....SlN '.....li'll'l" 001\11101. rtOJfCl Tlnl I DIY1510,," ,IOUCTlY! I ItOULAron _.INO U"" ~ t ...,......:..... ~, '-- TW........In"I'.TW. ....y........ "- ...... __ <o~....<.,_ .._._ 0"_ 0'_ _........_ ._., ........... --::.-:. I 7 ~_ 0'-10._ .-.......-. .......- '__'~O '--""'-L ~,Jr .... I!.... o~~~.. 4 r . .t'C"O~...tll '- , --'......... -', "- CRBSCP . Protective and Regulalory Pumping Unit Proleclive and Regulalory Pumping Unil Well Field and 242 Lateral The existing unit wells are located in a continuous line~ spaced at O.S-mile intervals along the southern pottion of Yuma Mesa next to the Southerly International Boun- dary. This field now consists of 21 wells and is to expand to a possible 35 well.. Plans for the well field development include completing the 14 additional wells in a line 1 mile north of the initial group. The rate of installation of these wells will be determined by the rate of decrease in drainage flows, the amount of change in the ground-water table. and the rate at which private irrigation and municipal users withdraw ground water by private wells. Maximum ground-water pumping within the S-mile zone will be limited to 160,000 acre.feet per year. The pumping of ground water through 1990 would ensure the capability of the United Stales to meet the 140,000 acre-feel per year obligation of water custom- arily delivered to Mexico at the Southerly International Boundary. Excess pumping capability from the well. will be available to supply additional water requirements for irrigation, municipal. and other uses. HilIander "C" Irrigation District, which is a private development adjacent to the well field. has entered into a temporary water contract with the U.S. Government for pumping up to 4,000 acre-feet of water per year from the 242 Lateral, and 8 permanent contract is being developed. This district includes about 3,44.0 acres, with about 2,300 acres currently under irrigation. The 242 Well Field, along with pumping in Mexico, may have a notable impact upon the existing private wells by lowering the ground-water levels. Domestic users in the 5-mile zone, other than HilIander"C' Irrigation District, are pumping about 4,000 acre-feet of water annually for municipal and irrigation use. The 242 wells are driJIed to a depth of about 600 feet; the lower 300 feet are screened. Each well is designed to pump an average of 7.5 cubic feet per second. The discharge of each well is collected in the 242 Lateral, which is a conveyance system that carries wafer westerly to the downstream side of the existing Boundary Pumping Plant, a facility of the Valley Division of the Yuma Project. The 242 Lateral is designed as an open and closed sys- tem consisting of a pipeline on each end and an open concrete-lined channel in the center. The reinforced concrete pipe ranges from 27 to 72 inches in diameter,