<br />eomp\lte!l for the expected levels of salinity . after
<br />Central Arizona Project water is blended into the Salt
<br />River. Project system (Table 8.87). As in previous
<br />study areas, these values were used in conjunction
<br />with Table 8-1 to construct yield declination curves for
<br />the respective crops.
<br />
<br />Results from the model indicate that littie change
<br />can be expected to occur in land use and production
<br />over the TDS interval in question. It can be observed
<br />in Table 8-88 that production and number of acres for
<br />
<br />N
<br />CO
<br />C')
<br />o
<br />
<br />Table 8.87.
<br />
<br />TDS
<br />(llIg/!)
<br />
<br />500
<br />
<br />600
<br />
<br />700
<br />
<br />800
<br />
<br />Effecti"e "al"es of soilsalltration e",tract
<br />conductivities (EOe '" lQ<J) in three soil
<br />draifl4ge cl4ases, f(1Ur TDB Ie"els, and
<br />ji"e irrigation treatments, &It Ri"er
<br />Project.
<br />
<br />Irrigation
<br />Number
<br />
<br />16
<br />22
<br />29
<br />35
<br />Sprinkler
<br />
<br />16
<br />22
<br />29
<br />35
<br />Sptinkler
<br />
<br />16
<br />22
<br />29
<br />35
<br />Sprinkler
<br />
<br />16
<br />22
<br />29
<br />35
<br />Sprinkler
<br />
<br />Drainage Cla&8ification
<br />Well Moderate Poor
<br />
<br />o
<br />o
<br />o
<br />o
<br />o
<br />
<br />o
<br />o
<br />o
<br />o
<br />o
<br />
<br />o
<br />o
<br />o
<br />o
<br />o
<br />
<br />0.1
<br />0.1
<br />0.1
<br />0.1
<br />o
<br />
<br />0.3
<br />o
<br />o
<br />o
<br />o
<br />
<br />0.7
<br />0.3
<br />0.1
<br />o
<br />o
<br />
<br />1.4
<br />0.8
<br />0.6
<br />0.2
<br />o
<br />
<br />1.5
<br />1.0
<br />0.8
<br />0.4
<br />o
<br />
<br />1.5
<br />1.2
<br />1.0
<br />0.8
<br />o
<br />
<br />2.2
<br />1.8
<br />1.6
<br />1.3
<br />0.3
<br />
<br />3.3
<br />2.7
<br />2.5
<br />2.1
<br />1.2
<br />
<br />3.5
<br />3.0
<br />2.8
<br />2.4
<br />1.4
<br />
<br />each of the selected crops are constant over the TDS
<br />range from 776 to 1400 mg!l for Colorado River water.
<br />It was also observed. that the shadow prices
<br />corresponding to the different classes of land were
<br />also constant. Since these values are relstive, little
<br />additional information could be gained from a table as
<br />presented in previous sections snd, consequently, one
<br />was not constructed for this district.
<br />
<br />Table 3.89 contains the estimated amount of
<br />water used in the district as a whole and on a per acre
<br />hasis. The resulting quality of hlended water ranges
<br />between 691 and 889 mg/l. Water within this quality
<br />range has negligible effects on agriculture in this area
<br />as is evidenced in Table 3.90. The objective function
<br />shows no change at any TDS tevel within the defined
<br />range and, therefore, no damages are assumed to
<br />accrue to agriculture as a result of irrigating with
<br />water from the Colorado River. In ",iew of this, no
<br />damage function has been constructed. The summary
<br />statistics contained in Table 3.91 illustrate that a
<br />monetary figure of damages is placed at zero for
<br />purposes of the present study.
<br />
<br />Land. SupplelllellW to Salt River Project
<br />
<br />Several small districts pump groundwater and
<br />contract for supplemental. irrigation from the Salt
<br />
<br />Table 8.89. Ratio of amount of water used to land
<br />and projit aU by Ie"el of TDB, Salt Ri"er
<br />Project.
<br />
<br />TDS
<br />(llIg/!)
<br />
<br />Acre Feet
<br />Per Ae:re
<br />
<br />Ratio of Net
<br />Dollar Return
<br />Per Acre Foot
<br />
<br />
<br />Acre Feet
<br />
<br />565
<br />900
<br />1100
<br />1400
<br />
<br />810,115
<br />810,115
<br />810,115
<br />810,115
<br />
<br />4.882
<br />4.882
<br />4.882
<br />4.882
<br />
<br />32.90
<br />32.90
<br />32.90
<br />32.90
<br />
<br />Table 8-88. Cropping and production potte.... CMnges, &It Ri"er Project.
<br /> Total Dissolved Solids (llIg/!)
<br />Crops 565 900 tlOO 1400
<br /> Production Land Use Production Land Use Production Land Use PrOduction Land Use
<br /> (Tons) (Acres) (Tons) (Acres) (Tons) (Acres) <Tons) (Acres)
<br />Alfalfa 275.149 46,954 275,149 46,954 275,149 46,954 275,149 46,954
<br />CottonS 67,763 31,084 67,763 31,084 67,763 31,084 67,763 31,084
<br />Barley 32,150 16,237 32,150 16,237 32,150 16,237 32,150 16,237
<br />Wheat 73,119 28,341 73,119 28,341 73,119 28,341 73,119 28,341
<br />Sorghum 40,601 30,393 40,601 30,393 40,601 30,393 40,601 30,393
<br />Lettuce 14,976 1,324 14,976 1,324 14,976 1,324 14,976 1,324
<br />Onion 12,139 692 12,139 692 12,139 692 12,139 692
<br />Grapefruit 23,360 1,990 23,360 1,990 23,360 1,990 23,360 1,990
<br />Oranges{Tangerines 35,288 3,987 35,288 3,987 35,288 3,987 35,288 3,987
<br />Sugar Beets 79,417 4,011 79,417 4,011 79,417 4,011 79,417 4,011
<br />Carrots 11,618 929 11,618 929 11 ,618 929 11,618 929
<br /> - - -
<br />Total 165,942 165,942 165,942 165,942
<br />a480-pound. bales.
<br />
<br />182
<br />
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