Any county conservation board may cooperate with the federal government or the state government or any department or agency thereof, including the Tennessee Valley authority and the United States army corps of engineers, to carry out the purposes and provisions of this chapter. Any county conservation board may join with any other county board or county boards to carry out this chapter, and to that end may enter into agreements with each other and may do any and all things necessary or convenient to aid and to cooperate in carrying out this chapter. Any city, town, or school district may aid and cooperate with any county conservation board or any combination thereof in equipping, operating and maintaining any parks, preserves, parkways, playgrounds, recreation centers, and conservation areas, and for providing, conducting and supervising programs of activities, and may appropriate money for such purposes. The department of environment and conservation, county agricultural agent, and other county officials shall render such assistance as shall not interfere with their regular employment. The county legislative body is authorized to make available to the use of the county conservation board, county-owned equipment and operators and any county-owned materials it deems advisable.