WSP01908

• File Number: 8278.300
• Description: Title I - Merxican Deliveries
• Basin: Colorado Mainstem
• Date: 2/1/1963
• Author: USDOI/BOR
• Title: Special Studies - Delivery of Water to Mexico
• Water Supply Pro - Doc Type: Publication

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Phases 1 and 2 wen combined (vi thout increased cotton acreage)

vouJ.d reduce the peak saJ.t concentrations in the vater delivered to

Mexico to about 1,800 ppm, \/hile still maintaining satisf'actory

ground-water conditions vithin the District. Reduced drainage

puIIqling associated vith increased cotton acreage, if' combined vith

Phases 1 and 2, woul.d further reduce the peak saJin1ty. The esti-

mated cost of' Phase 2 construction is $30,000,000. Of' this amount

it is estimated that $21,000,000 is for the f'lood-control channel

and dikes.

Phase 3 involves totaJ. overalJ. river reguJ.ation on the Lower

Colorado River and wouJ.d consist of' integrating ground-vater puIIqling

vith the river regulation that vill be provided by Senator Wash

RegUlatory Reservoir now under construction.

The studies on which the above recommendations are made incJ.udedl

(1) periodic vater ssmpllng and snaJ.yses from selected locations on

the Colorado River and on drains providing return fl.ow to the river

below Hoover Dam; (2) forty-nine 12-inch test vells drilled to an

average depth of-130 f'eet from wich both water and soU ssmples

were collected at varying depths to evaJ.uate in detail the quantity,

quality, and loca"tion of ground water underlying the \lellton-Mohawk

Valley; (3) numerous shallow test borings in both the irrigated and

non1rrigated areas of' the Wellton-Mohawk District from whicb soil

and water ssmpl.es were taken to evaJ.uate the degree of' land recla-

mation acco~llsbed and rpmR1n1ng to be acco~lished; (4) a f'ield

study of' soiJ.a in the MexicaJ.1 Valley, which was limited by Mexico

to one veek, during which samples were coll.ected f'rom 20 type

locations and subjected to detailed laboratory analyses;

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