Document: The Supreme Court's Decision in Arizona v. California and its effect on California's water supply, Northcutt Ely, July 12, 1963, page 7purposes, upon the Court's reversal of its holding that the tributaries are to be excluded from the calculation of the lower basin's total supply. But it must be recognized that even if California prevails upon a petition for rehearing on this issue, our half of the "excess," according to present estimates of the water supply, will nevertheless fail to furnish an additional dependable supply of anything like the million acre-feet above 4.4 million that California's Colorado River projects were built to use. A deficiency problem will thus remain even if no Central Arizona Project is built. It will b...