(1) The county legislative body may also provide by ordinance for the protection and use of flood channels and present flood plains on rivers, streams, and canals located within the county and the incorporated municipalities in the county and may establish by ordinance the boundaries of these flood channels and present flood plains.
(2) The county may acquire and hold by gift or purchase, such lands, rights-of-way, easements, or other interests in property within the established boundaries of these flood channels and present flood plains.