(a) The purpose of this chapter is to enable existing improvement districts or any improvement districts to be created, to make, or contribute to the cost of, improvements for the purpose of flood prevention and control, preventing erosion, floodwater, and sediment damage, and of furthering the conservation, development, utilization, and disposal of water in interstate watershed projects.
(b) The provisions of this chapter shall not be construed to impair or limit in any way the interstate rights of the federal government or any of its departments or agencies, with respect to its jurisdiction, management, or control over waters or other matters or projects of an interstate nature. It is the purpose and intention of this chapter that neither the powers granted herein nor any agreement pursuant hereto shall interfere directly or indirectly with the federal jurisdiction or authority.
(c) None of the additional powers granted by this chapter shall be exercised except for the purpose of participating in programs authorized by the Congress of the United States relating to the control and prevention of floodwater and sediment damages and the conservation, development, utilization, and disposal of water.