WSP06476

• File Number: 8271.300
• Description: Colorado River Basin Salinity Control Program - General Information and Publications-Reports
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/1978
• Title: Salinity Management Options for the Colorado River -- Part 1 of 2 -- Title Page - Page 168
• Water Supply Pro - Doc Type: Report/Study

c.:,. Table 2. Summaf'/l of yield losses 1m the Colorado Indian Reservation lands due to increasing salinity of
irrigation water from the Colorado River and irrigation method as compared with present water
N quality and best irrigation practice, projected 1m the basis of completed project acreage.
"" Irrigations Total Dissolved Solids in Irrigation Water._mg/l
Crop Per Year
~ 900 1000 1100 1200 1300 1400
Alfalfa Hay 16 5.41 9.24 13.97 17.50 21.17 24.59
(1000 Tons) 22 3.99 5.41 7.15 10.24 14.21 17.75
28,490 Ac. 29 3.42 4.70 5.98 7.71 11.56 14.78
35 2.56 3.56 4.70 5.69 7.11 8.85
Sprinkler 1.71 3.27 4.27 5.55 6.83
Cotton 16 0.11 0.39
(1000 Bales)
25,510 Ac.
Wheat 16 0.13 0.39 0.61 0.86 1.12
(1000 Tons) 22 0.09 0.26 0.52 0.65
20,520 Ac. 29 0.20 0.39 0.61
35 0.20 0.35
Sprinkler 0.13
Grain Sorghum 16 0.04 0.08 0.20 0.27 0.36 0.49
(1000 Tons) 22 0.04 0.11 0.17 0.25 0.32
7,500 Ac. 29 0.07 0.13 0.20 0.27
35 0.06 0.13 0.19
Sprinkler 0.05 0.12
Cantaloupes 16 14.78 20.94 33.91 44.56 56.55 66.32
(1000 Crates) 22 10.30 14.78 19.26 24.08 34.84 45.49
1.580 Ac. 29 8.06 12.54 17.02 20.61 27.74 36.63
35 5.38 9.16 12.54 16.13 20.61 24.19
Sprinkler 3.14 7.62 11.20 15.23 19.71
Lettuce 16 379.39 541.18 726.40 826.21 1072.38 1272.97
(1000 Cartons) 22 182.11 309.13 463.36 579.02 782.37 979.42
8,680 29 140.01 235.80 352.83 482.28 678.05 855.70
35 102.17 147.58 196.77 285.00 457.36 612.31
Sprinkler 68.11 128.66 177.85 234.62 330.41
Onions 16 3.076 4.834 5.242 5.569 7.202 9.080
(1000 Tons) 22 1.117 2.750 4.382 4.834 5.406 5.977
1,580 Ac. 29 0.539 1.862 3.434 4.589 5.161 5.645
35 0.373 0.826 1.617 2.920 4.508 5.079
Sprinkler 0.249 0.498 1.203 2.447 3.936

Salt River Valley Water U80ro Assodation. The
134,225 acres of SRVWUA crop land was divided into
73,815 acres well drained, 48,325 acres moderately
drained, and 12,085 acres poorly drained. Only minor
yield losses on the poorly drained soil would result
from the CAP salinity and these losses would be due
primarily to irrigation practice as is shown in Table 3.

The SRP Supplemental IrrIgation Service. The
SRP Supplemental contracts include Fort McDowell
Indian Reservation, Salt River Indian Reservation,
and the irrigation districts of Gila Crossing, Maricopa
Colony, Peninsular Horowitz, and St. Johns for a total
of 16,249 acres irrigated in 1973. This was divided into
8,937 acres well drained, 5,850 acres moderately
drained, and 1,462 acres poorly drained. The only
yield reduction would occur in alfalfa on tbe poorly
drained soil, Table 4.

The R0080velt Water Con80rvation District. The
RWCD has 34,703 acres of cultivated crop land, of

which 28,188 acres were irrigated in 1973. Their water
supply averages approximately 50.000 ac It of surface
water from the SRP and 100,000 ac It of groundwater.
If an allotment of 50,000 ac It CAP water is assumed,
50,000 ac It of groundwater would still have to be
pumped to meet needs. The CAP water could be
delivered either directly to the RWCD or mixed with
the SRP surface water above Granite Reef Dam and
then delivered to RWCD. The fll'st alternative would
result in a blend of 603 mg/I initially wbich would
increase to 681 mg/I. The second alternative would
result in a blend of 672 mg/l initially wbich would
increase to 880 mg/1. In either event, yield reductions
would result principally on the 7,877 acres of poorly
drained soil, as summarized in Tables 5 and 6.

Roosevelt Irrigation District

The RID has a total irrigable area of 38,152 acres
irrigated entirely from groundwater. Their estimated

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