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. ~ I:> ~ 0:. . . ANTICIPATED EFFECTS OF ADDITIONAL DEVELOPMENTS (continued) acres (3324 ha) of land in California are to be developed. The consumptive use requirement for irri~ation of these lands is estimated to be 4 acre- feet per acre (12 000 m Iha) which would result in an annual mainstream depletion of 430,352 acre-feet (531 x 106m3). The estimated consumptive use in 1978 from irrigation of 75,405 acres (30 500 ha) is 289,500 acre- feet (372 x 106m3). This leaves an additional depletion of about 12B,732 acre-feet (159 x 106m3) per year for future development of irrigated lands. The Bureau of Indian Affairs has reported a general 2,000 acres (800 ha) per year land development rate on the reservation in the past. The land development rate of 2,000 acres (800 ha) per year was assumed for the future even though the Bureau of Indian Affairs feels the land deve- lopment rate may slow down in the near future. Therefore, by 19BO, there will be an additional 4,000 acres (1629 ha) and 16,000 acre-feet (20 x 106m3) of use, by 1990, 20,000 acres (80 000 ha) and BO,OOO acre-feet (99 x 106m3) of use and by 2000, B,183 acres (3300 ha) and 32,732 acre- feet (40 x 106m3) of additional use. Lower Colorado River Channelization Project, Arizona-California. Between Davis Dam and Parker Dam channelization work in the Mohave Valley Diversion was begun in 1949 and completed in 1960 to salvage 65,000 acre- feet (BO x 106m3) of water per year. Be low Parker Dam 24,200 scre-feer (30 x 106m3) of water salvage by channelizarion was planned for the two sections of the Parker Division. This was started in 1966 and section one of the division was completed in 1967. It has been estimated that half of the salvage work associated with the division has been completed. Work began in 1962 and was completed in 1966 to salvage 10,000 acre-feet (12 x 106m3) in the Palo Verde Division. In 1964 work to salvage 36,000 acre-feet (44 x 106m3) began in the Cibola Division and was complete in 1970. No future salvage of water has been anticipated. Salvage of water by replacing phreatophytes with vegetation that uses less water and is envi- ronmentally more beneficial is being considered. lB. Augmentation Public Law 90-537 (dated September 30, 1968) states that augmenta- tion of the Colorado River will be a national obligation in order to supply the Mexican Treaty requirements. Although temporary periods of subnormal water supply can be satisfied from storage releases, permanent deficiencies caused by full utilization of the waters allocated to the States would require augmentation. 60