WSP07816

• File Number: 8509
• Description: San Luis Valley
• State: CO
• Basin: Rio Grande
• Water Division: 3
• Date: 6/1/1958
• Title: Ground-Water Resources of the San Luis Valley Colorado
• Water Supply Pro - Doc Type: Publication

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FIGURE 1.
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ILLUSTRATIONS

[All plates in pocket except as indicated]

Map of part of San Luis Valley) Colo., showing location of
wells and springs.
Jetting observation wells _______________________ Facing
Log of well on Baca Grant.
Artesian wells. A, Well 43-8-31bc2 discharging at the
rate of about 580 gallons a minute; B, merc~ry pressure
gage used in measuring head of flowing welL___ Facing
Reconnaissance piezometric map of part of San Luis
Valley.
A Parshall flume used in measuring discharges of large
'wells' B discharge of Mcintire Springs _______ Facing
, '.. . Facing
Deep-well IrrIgation ___________________________
Map of part of San Luis Valley, showing water-table
contours, 1948-49.
Map of the sump area of San Luis Valley, showing con-
tours on the water table during the period September-
November 1946.
Map of the sump area of San Luis Valley, showing con-
tours on the water table during the period May-June
1947.
Sections along and across proposed line of closed basin
drain.
Classification of ground and surface water for irrigation.
Analyses of unconfined and confined ground water from
indicated wells, showing the lowest, average, and high~
est concentration of dissolved solids.
Analyses of unconfined ground water in the closed basin,
showing the average concentration of dissolved solids by
land-survey ranges.
Maps of the area of inflow-outflow study, showing poly-
gons used for determining changes in ground-water
storage.
Map of part of San Luis Valley, showing line of proposed
closed basin drain, lines of cross sections, test holes, and
test wells.
Index map of Colorado, showing area described in this re-
port and areas on which ground-water reports are pub-
lished or are in preparation _________________________
VVell-numbering syst~ ________________________________
Profile of San Luis Valley from a point 0.2 mile east of
Del Norte to a point 10 miles east of San Luis Lake___
Nonnal monthly precipitation and mean monthly tempera-
tures at Monte 1fista _______________________________
Annual precipitation in San Luis Valley ________________
Geologic sketch map of San Luis Valley ________________
Graph of artesian-well development ____________________

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32

Gradient of piezometric surface before, during, and after
irrigation __________________________________________ 31
Map of part of Spring Creek artesian area, showing loca-
tioH of wells _______________________________________ 35
Relation of uniformity of grain size to porosity and
permeability _______________________________________ 50
Subbing method of irrigation. A, Local rise in water table
in area where the subbing method is practiced; B, inter-
ference between the pumping and the sub'bing methods
of irrigation _______________________________________ 63
12. Fluctuations of water levels in 5 wells in the subbed and
pumped irrigation areas in the closed basin and graphs
Showing monthly precipitation at Monte Vista ________ 64
13. Fluctuations of water levels in 4 wells in the sump area
of the closed basin and graphs showing monthly pre-
cipitation 3 miles west of San Luis Lake _____________ 65
14. Fluctuations of water levels in 5 wells south of the Rio
Grande and graphs showing montWy precipitation at
Alamosa __________:-________________________________ 66
15. Fluctuation of water level in well 40-6--16cc caused by
water in nearby Rio Grande canal during periods of
irrigation __________________________________________ 70
16. Diurnal fluctuations of water level in well 39-9-2bb______ 73
17. Location of test well 50 and observation wells ___________ 78
18. Semilogarithmic plot of the results of pumping test well 50 79
19. Graph of irrigation-well development in the inflow-outflow
area _______________________________________________ 82
20. Surface-water inflow and ground-water pumpage in the
inflow-outflow area _________________________________ 86
21. Analyses of surface water ____________________________ 98
22. Schematic cross section of water table normal to axis of
drain, illustrating method of determining quantity of
water that may be intercepted by proposed closed basin
drain ______________________________________________ 104
23. Boundaries of area of inflow-outflow study ______________ 121

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TABLES

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TABLE 1. Yield, drawdown, and specific capacity of 20 pumped
artesian wells ______________________________________ 46
2. Estimated quantity and cost of water pumped from shal-
low irrigation wells in the inflow-outflow area _________ 88
3. Percent sodium in samples of water ____________________ 97
4. Estimated yield of proposed closed basin drain during low
stage of the water tahle _____________________________ 112
5. Estimated yield of proposed closed basin drain during
high stage of the water tahle ________________________ 115
6. Records of wells that were test-pumped ________________ 130
7. Analyses of water from typical wells __________________ 134
8. Analyses of surface water ____________________________ 156
9. Analyses of water from wells that were test-pumped____ 162
10. Records of wells in part of San Luis Valley ____________ 168

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