Flood control districts created under this chapter shall have authority to enter into contracts with, and/or contribute funds to, the United States or any agency thereof, or with, and/or contribute funds to, the state of Washington, under any act of congress or of the state of Washington now in force or hereafter enacted for the assumption of the control and management of the works for such period as may be designated in the contract, or other cooperative arrangement.
RCW 86.09.166