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<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 />