WSP05654

• File Number: 8541
• Description: San Luis Valley Project
• State: CO
• Basin: Rio Grande
• Water Division: 3
• Date: 1/1/1939
• Title: Period of Study
• Water Supply Pro - Doc Type: Report/Study

APPENDJX E

Table E-10. Mj","Imnrn Flows, Midd;1.e Valle.:\'
(1,000 acre-feet)

Flow in
Middle V,,11ev
15
15
~5
65
70
72
78
66
54
~O
15
25
510

Depletion otowi
to F.l"phant. Butte
8
8
17
~6
S8
67
66
. 59
~7
23
8
J,'3
490

Elephant. Butte
effective inflow
7
7
18.
29
12
S
12
7
17
7
7
12
1(,0

Month
January
February.
March
April
J4ay
JIml
Jul;r
AUgust
September
October
November
December
Total

c

For water in excess of the above minimum schedule (Otowi routed
plus tributary inflow Otowi to San Marcial minus scheduled rniTrlmum otowi)'
it was assumed that 31 percent would be lost am the balance would be
effective Elephant Butte Reservoir inflow. This was determined on the
basis of inflow am loss indicated by the maxiJ:!um and minimum point.s on
the above ment.i.oned curve. The distribution of theannua1 depletion by
months for the base flows was taken from data in the Middle Rio Grame
Project Report, dated August 1947.

Although water \Tas routed only as far as Lobatos on a monthly
basis, it was necessary to keep a continuousamual account of the content
of Elephant Butte Reservoir to deterJ:1ine by. comparison with Study 6 the
timeatd magnitude of release of debit water, the periods when increase
in storage in Wagon Wheel Gap Reservoir was prohibited UDier the terms ,of
the Compact, and the reduction in credits resulting from evaporation from
Elephant Butte Reservoir. In this accounting, New Jlenco IV8S oonsidered
to operate the same as in study 6. The change in flow at Lobatos between
Studies 6 am 12-R was routed tbrough New Mexico by use of the routing
curve with the resultant change in the inflow being re1'lected in the con- .
tent. of Elephant Butte Reservoir. By use of the relationship between total
inflow am allowable depletion umer the terms of the Rio Grande Compact
for routing the fl0\7s from Otoui to Ele phant Butte Dam, New Mexico would,
in the st_udy, automatically .compJ,y wit:l the. Rio Gram~ Com~ct 'wit1i the
. . annual" vt:l!'iat:l:oIlS from the" mean .relationship .ba1anl;j..ng,pirllr a period of . "
~ -, .' .,.....ieal-.s. . ',:. .... -. .~. ':., ':. ..... ..... . .'. . ....'~. .',: '. . . . -' .": "

~lease Schedule - Elephant. Butte and Cab,,11o Reservoirs

(
\.-----,;

The Rio Gran:l.e COlnpact establishes an average annual release for
use below C4ballo Rellervoir. It was made on the following schedule which
was furnished by the Projeot Ilanager. Rio Graa Project.

f
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fi?;.,

E-39

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