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

Pumpin~ Re~imen No.3

Yuma Ncsa "'ells (60,000 AF/vr)
Yuma Vallev '{ells (50.000 AFfyr)
Yuma Ncsa \{ells (150,000 AFhT)
Sonora, ~lexico 1\ells (160.000 AF/yr)
Omitting 65,000 AF/yr Pumped into Yuma

Vallev Drains
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The computed chDnge in 1\'ater levels after 50 years of pumping
is shown on Figure B-12. The quantitative effects after
50 years of pumping are given in Table 2. It should be noted
that the analog model 11as so structured that the 65.000 AF/yr
pumped from the existing drainage 1,ells in Yuma Valley 1;as
omitted and 1;auld not be potentiallY salvageable. Except for
this change in the model input, Pumping Regimens No.2 and No.3
are identical but there is a significant difference in the
prediction analysis. A recapitulation of No.3 pumping effects
follows.

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a) Reduction and recharge from the Colorado River would be
57,600 AF/yr (50-year average); ,

b) Depletion of surface drainage flows at S.l.B. would be
38,600 AF/yr (50-year average);

c) Depletion of groundwater storage in United States 110uld be
5,830,000 AF at the end of 50 years;

d) De}lletion of grouncll;atcr storage in Hcxico ,,'ould be
9,550,000 AF at the cnd of 50 years;

e) The flow from grounchmter storage at the southern limit
of the analog Ulodcl (auout 30 miles south of Arizonu-
Sonora lJo\lllClary) 11'Ould bc 21,000 AF /yr (50-year 11 vcrage) .

f) At the end of 50 years, thc change in ground1wter fl01>'
across thc J\rizona-Sonora bOllllllary to }lexico would be
-27,000 AF/yr and thc total floH across this boundary
,,'ould be about 18,000 J\P/yr.

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