WSP05700

• File Number: 8278.400
• Description: Title I - Mexican Treaty
• Basin: Colorado Mainstem
• Date: 2/17/1973
• Author: IWBC by Harshbager
• Title: Memorandum Report MR-73-1 Appendices, A - Groundwater Conditions in the Colorado River Delta Area, United States and Mexico and Appendix B - Pumping Regimens, Effects and Prediction Analysis
• Water Supply Pro - Doc Type: Publication

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APPEKDIX A

GROUNDHATER CONDITIONS IN THE COLORADO RIVER DELTA AREA,
UNITED STATES ili'lD HEXICO

INTRODUCTION

The purpose of this report is to present a brief resume
of ground~ater conditions in the Colorado River Delta Area in
United States and Nexico. This resume is divided into two
major parts: 1) Description of physical conditions on the charac-
ter of the subsurface materials; occurrence of ground\mter; and
the hydrological conditions, including significant changes that
have been imposed on the natural systems by man's activities.
2) A prediction analysis on the changes that probably would occur
by the various pumping regimens which have been initiated in
United States and Mexico in the last half of 1972, and the pro-
posed pumping regimens in future years; lvhich are under con-
sideration by United States and Nexico. ./

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The information presented in this report was drawn from
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published reports and internal data obtained from the
U.S. Geological Survey and Yuma Projects Office, Bureau of
Reclamation. The predietion analysis: computed change in
water levcls and quantitative values in Tables I and 2 were made
by Mr. Genc Patten, Chief of Analog Model Unit, U. S. Geological
Sun"cy, Phoenix, Arizona. Grateful appreciation is extended
for these vnll:nble contriuutions and assistance.