The appropriation must be for some useful or beneficial purpose, and when the appropriator or his successor in interest ceases to use it for such purpose, the right ceases.

[(42-104) R.S., sec. 3156; 1899, p. 380, sec. 3; reen. R.C. & C.L., sec. 3243; C.S., sec. 5559; I.C.A., sec. 41-104.]