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N 00 CO (it 7lJble 8-99. Effect. of increaBing .alinity of Central ANona Project water when it ill blended with Salt River Project BUrftu:e _ter before being delivered to the RooBevelt Water COnBervation DiBtrict (aBBUming /J7I allotment of 1400,000 ac It, 150,000 Salt River Project, and 50,000 RooBevelt Water ConBervation DiBtrict, delivered abOlJe Granite Reef Dam). 150,000 aoft 100,000 ac ft 50,000 aoft Blended Cen tral 200,000 ac ft Blended Salt River Roosevelt Water Atizona Project, Central Arizona Project and Central Conservation District Salt River Project, Project Water Arizona Project Groundwater and Roosevelt Water TOO (mg/I) Water TDS (mg/I) Conservation District TDS (mg/I) Groundwater TDS (mg/!) 775 522 765 603 900 548 765 620 1000 566 765 632 1100 585 765 645 1200 603 765 657 1300 621 765 669 1400 639 765 681 900,000 ac ft Salt and Verde Rivers Water TDS (mg/I) 470 470 470 470 470 470 470 Table 8-100. Effect. of increaBing .alinity of Central ANona Project _ter when it ill ble1Uled into the Roo.evelt Water ConBervation DiBtrict Water (aBBUming an allotment of 50,000 ac It of Central ANona Project Water) delivered directly to the Roo.evelt Water ConBervation DiBtrict Sy.tem. 50,000 ac-ft Salt and Verde Rivers Water3 TDS (mg/I) 50,000 ac-ft Groundwater TDS (mgfI) 100,000 ac-ft Roosevelt Water Conservation District Water TDS (mg/!) 50,000 ac-ft Central Arizona Project Water TOO (mg/!) 150,000 ac-ft Blended Cen tral Arizona Project, and Roosevelt Water Conservation District Water TDS (mg/I) 672 713 747 780 813 847 880 470 470 470 470 470 470 470 765 765 765 765 765 765 765 620 620 620 620 620 620 620 775a 900 1000 1100 1200 1300 1400 apfesent salinity of the Colorado River water at the Central Arizona Project diversion point above Parker Dam. Thble 8.101. Number of acre. avaiIJLblefor .ingle and double cropping by In.nd c/as., Roo.e. velt Water ConBervation DiBtrict. Single Double Total Cropped Cropped (Acres) (Acres) (Acres) LandI 10,630 2,574 13,204 (Well Drained) land 2 12,6Hl 2,680 15,290 (Moderately Drained) land 3 6,365 1,337 7,702 (Poorly Drained) Total 29,605 6,591 36,196 area. Some 6,600 acres or about 18 percent of the total are allocated for double cropping purposes. A double cropping matrix is presented in Table 3-102 along witb a list of the selected crops. Base yields were derived from data contained in Table 3.103 from wbich declination curves were formed. Once again the model results indicate that no measurable change in land use and production patterns should be expected within the TDS ranges defined for this study and, therefore, a damage function was not constructed for this area. Tables 3-104, 8-105, 3-106, and 3-107 are presented in order to illustrate the magnitudes assumed by the different factors such as the respective crop production and land use, water use, and estimated value of net returns to the area both as a whole and on a per acre basis. Roosevelt IrrIptIOD DistrIct The Roosevelt Irrigation District (RID) is in western Salt River Valley and includes an area approximately 20 miles long and 8 miles wide along the north side of the old Gila River channel between the Agua Fria and Hassayampa Rivers (Map 8-12). The total irrigable area is 88,152 acres. In 1973 this 187