Investigation having shown that conditions in and surrounding the federal service area of the San Luis unit of the Central Valley project are peculiar to that area, it is hereby declared that a general law cannot be made applicable thereto and that this part is therefore necessary for the proper distribution, use, and control of the natural supplies of water now available for said area and of the water to be made available from the San Luis unit of the Central Valley project, and for elimination of duplication of governmental authority, the securing of greater economy of administration, and the more efficient and effective utilization of ground water and imported water supplies.