Shasta Dam shall be constructed and used primarily for the following purposes:
(a) Improvement of navigation on the Sacramento River to Red Bluff.
(b) Increasing flood protection in the Sacramento Valley.
(c) Salinity control in the Sacramento-San Joaquin Delta.
(d) Storage and stabilization of the water supply of the Sacramento River for irrigation and domestic use.
(Added by Stats. 1943, Ch. 370.)