Idaho constitution
Article XV
Section 4

Whenever any waters have been, or shall be, appropriated or used for agricultural
purposes, under a sale, rental, or distribution thereof, such sale, rental, or
distribution shall be deemed an exclusive dedication to such use; and whenever such
waters so dedicated shall have once been sold, rented or distributed to any person
who has settled upon or improved land for agricultural purposes with the view of
receiving the benefit of such water under such dedication, such person, his heirs,
executors, administrators, successors, or assigns, shall not thereafter, without his
consent, be deprived of the annual use of the same, when needed for domestic
purposes, or to irrigate the land so settled upon or improved, upon payment
therefore, and compliance with such equitable terms and conditions as to the quantity
used and times of use, as may be prescribed by law.