All acts and proceedings had before July 1, 1959, and all contracts, appropriations, expenditures, and acquisitions theretofore made by any municipality of the state for the purpose of conserving its water resources or preventing or controlling flooding within or without its corporate limits which endangers property within its corporate limits or its water supply, either by such municipality acting alone or in cooperation with any authorized agency, subdivision, or unit of government, federal or state, are hereby legalized and declared valid.

Source: SL 1957, ch 505; SL 1959, ch 463; SDC Supp 1960, § 65.0337.