The Department of Welfare, with the approval of the Governor, shall select for acquisition by the Department of Property and Supplies in the name of the Commonwealth, land for the erection and construction thereon of a new institution for mental defectives, with a capacity of not less than six hundred inmates. Such land shall provide ample water supply and be capable of adequate sewerage and drainage, and the acreage obtained shall be sufficient for the most productive agricultural employment of the inmates.
50 P.S. § 589.1