Idaho Code § 43-1407
The authority extended to joint interstate districts under the preceding section shall be construed to include the right to drain its lands under section 43-1406 .
[(43-1407) Compiled from 1917, ch. 31, sec. 2, p. 73; reen. C.L., sec. 2438o; C.S., sec. 4442; I.C.A., sec. 42-1407.]