(70 ILCS 2105/13) (from Ch. 42, par. 396)
    Sec. 13. All the rights and property of said district in the waters and water courses of said district and in their uses as herein specified, shall be exercised and used in such manner as to promote the welfare of said district and the inhabitants thereof, and to promote the safest, most economical and reasonable use of the waters thereof, and to pay the cost of the construction and maintenance of improvements in so far as practicable.
(Source: Laws 1931, p. 530.)