This is a continuing obligation. See Washington County Irrigation Dist. v. Talboy, 55 Idaho 382, 390, 43 P.2d 943, 946 (1935); Glavin v. Salmon River Canal Co., 44 Idaho 583, 589-90, 258 P. 532, 534 (1927). Partial forfeiture makes possible allocation of water consistent with beneficial use concepts.