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9. Staging of Construction to Meet Needs It is axiomatic in water resource planning that water be made available as the demand therefore is created. However, in the interests of economy, development should be staged so as to defer capital investments so as to coincide as closely as possible with the buildup in demand. Accordingly, the implementation of the plan embodies a carefully staged development of the units included therein which will effect substantial economies without detriment to water users. As the population and water demands of the Pacific Southwest increase in the future, the demand-supply relationships may change from those assumed for purposes of this report, in which event suitable adjustments can be made in construction schedules. 10. Priority Planning Program It is contemplated that the Secretary of the Interior would be authorized and directed to give priority to completion of planning reports on tributary projects within the Pacific Southwest where undeveloped local water supplies are available or can be made available by replacement or exchange, and to other projects, including Indian reservations, in Arizona, California, and Nevada which can utilize the waters of the Colorado River by direct diversion. It is contemplated further that the authorizing legislation would reserve a prior right to mainstream water in a reasonable amount as against the Central Arizona Project for the benefit of future projects making direct diversions from the Colorado River for use in Arizona. 49Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,362,624 byte