(a) The authority may act as a local sponsoring agent for or otherwise aid and supplement upstream soil and water conservation and flood prevention projects authorized by a state or federal agency in conjunction with a soil and water conservation district.
(b) The authority may make arrangements satisfactory to the United States Secretary of Agriculture to defray the cost of maintaining or operating a project under Subsection (a). An arrangement made under this section must be in accordance with regulations presented by the secretary of agriculture.
(c) Any portion of the total construction costs of a project described by Subsection (a) allocable to flood control or soil conservation shall be paid for or financed by money originating in the county in which the project is situated. The money may be of any kind, except from a tax imposed under Subchapter F.