(a) In addition to the purposes for which municipalities are now authorized to exercise the power of eminent domain, cities of the first class and cities of the second class are authorized to exercise such power for the purpose of acquiring real property or interests in real property necessary for the construction, operation, repair, or maintenance of flood control improvements including, but not limited to, dams, levees, reservoirs, spillways, floodways, and other related improvements.
(b) Cities of the first class and cities of the second class shall exercise the power of eminent domain for the purposes prescribed in subsection (a) of this section in accordance with the procedures and methods prescribed in §§ 18-15-303 — 18-15-307 or in accordance with the procedures and methods prescribed in § 18-15-401 et seq.