(a) In addition and supplemental to the authority vested in the counties by sections 46-80 and 46-80.1, any county having a charter may enact an ordinance, and may amend the same from time to time, authorizing the creation of special improvement districts for the purpose of providing , financing , and coordinating federal, state, and county efforts to engage in: (1) Supplemental maintenance and security services ;(2) Environmental research, restoration, and maintenance;(3) Natural resource management;(4) Natural hazard mitigation;(5) Climate change and sea level rise adaptation; and(6) Other improvements, services, and facilities within the special improvement district as the council of the county determines will improve environmental conditions, provide community benefits, and restore or promote business activity in the special improvement district and the making and financing of improvements therein.Each separate special improvement district shall be established by a separate ordinance enacted as provided in the ordinance authorizing the creation of special improvement districts. The ordinance authorizing the creation of special improvement districts may permit the county to provide for a board or association, established pursuant to chapter 414D, to provide management of the special improvement district, and to carry out activities as may be prescribed by the ordinance authorizing the creation of special improvement districts and the ordinance establishing the special improvement district as permitted thereby.