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

third resistor-capacitor network. Thus, 1nthe Yuma Valley area
the model includes a three layer network so that the effects of
water level declines on the gravity drains can be evaluated in
the overlying fine-grained sediments. The effect of any pumping
regimen imposed on the grounw\ater system can be readily de-
termined; such as, regional water level decline, changes in
ground,mter storage (including Yuma Valley), depletion of flo"
in the gravity drains. It was assumed that both the ~ravity
drainage and wa~er from Dumped drainage wells would be potentially
salvageable.

The southern boundary of the model, more than 30 miles south
of Sall Luis, is simulated by taking account of the ability of
the sediments to transmit ,"ater in response to changes ,in 'vater
level. The fault zone, passing through the Yuma Hesa across
which head differences of about 30 feet occur, is modeled as
a zone of greatly reduced transmissivity.,

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