The taking and damaging of property or rights therein or thereto by a flood control district to construct an improvement or to fully carry out the purposes of its organization are hereby declared to be for a public use, and any district organized under the provisions of this chapter, shall have and exercise the power of eminent domain to acquire any property or rights therein or thereto either inside or outside the operation of the district and outside the state of Washington, if necessary, for the use of the district.