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

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\ Table E-S. Diversion Demands near Del Norte in 1.000 Aere-fee't
Areas lVith Areas lVith Gross Divertible Net
Month Partial sUDlll'{ 1',,11 SU?D~Y demare, return flow demam
J'anuary 0 0 O' 0 0
Fe bruary 0 0 0 0 0
March 0 0 0 0 0
April 58.8. 3.S. 62.6 4.0 58.6
Ifs.y 62.4 18.6 81.0 6.5 74.5
June 128.4 22.4 150.8, 12.0 138.8
July 132.8 19.3 152.1 13.0 139.1
August 97.6 12.7 110.3 lO.5 99.8
September 31.2 6.3 37.5 3,0 34.5
October lO.S 2.9 13.7 1.0 12.7
November 0 0 0 0 0
Deoember 0 0 ood 0 0
Total 522,0 86.0 50.0 558.0

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The adopted schedule will permit continuation of sub-1rrigation
in the western part of the Rio Grande Division service area, I7here this
practice is mandatory to prevent leaching of the fertUity from the soils,
Surface iITigation will C9ntinue in the areas where heavier soils predomi-
nate am leaching is not a problem. The schedule would also permit opti-.
mum use of tbe available water sup~ UIJder terms of the Rio Grande Compact,
and furnish, except for limited periods, a full surface water supply to the '
Rio GrameDivision service area lands.

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Inflol7 -Alamosa to Lobatos

Historical inflows betl7een Alamosa am Lobatos, exclusive of the
Conejos River flows, were oomputed from reoorded data, AllY differenoe
from historical diversions of the Empire am Monte Vista oanals would
challie this innow because return flows from lams served by these canals
reach the river between Alamosa am Lobatos. A oorrection was made when
the diversions differed from historioal, The eorreo'!;ion is 30 percent of
the algebraic difference between historical diversions am diversions that
1I'Ould be supplied with Wagon Wheel Gap Reservoir in operation,. It was:
applied with a 3o-day lag, This water is not usable for irrigation but is
ani can be used to meet scheduled 9?Jllpact deliveries.

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Wa!!on Wheel GaD Res6'!'Vo~r Lesses.. .. .' :'. ., .. . ..'
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The 'evaporation rate from Wagon liheel Gap ReserVciir, as shoWn .
on Figure E-7, used in this study vIas determined as follows: Average
distribution was obtaimd by using the Weather Bureau evaporimeter data..
This distribution was applied to knoun pan evaporation rates at Garnett '.
am at Wagon iheelGap Experimental Station. . Evaporation ra-hes were esti~..
mated for the winter months when no evaporation records uere available.
The llVBrage known am estilllated pan evaporation rates ware.. comrertedto
gross reservou- evaporation rates (faotor 0.69)_ .and the gross evaporation

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