Section 41-12-214 - When compact becomes operative(a) This compact shall become operative when approved by the legislature of each of the states, and when consented to by the congress of the United States by legislation providing, among other things, that: (i) Any beneficial uses hereafter made by the United States, or those acting by or under its authority, within a state, of the waters allocated by this compact, shall be within the allocations hereinabove made for use in that state and shall be taken into account in determining the extent of use within that state; (ii) The United States, or those acting by or under its authority, in the exercise of rights or powers arising from whatever jurisdiction the United States has in, over and to the waters of the Belle Fourche River and all its tributaries, shall recognize, to the extent consistent with the best utilization of the waters for multiple purposes, that beneficial use of the waters within the basin is of paramount importance to development of the basin, and no exercise of such power or right thereby that would interfere with the full beneficial use of the waters shall be made except upon a determination, giving due consideration to the objectives of this compact and after consultation with all interested federal agencies and the state officials charged with the administration of this compact, that such exercise is in the interest of the best utilization of such waters for multiple purposes; (iii) The United States, or those acting by or under its authority, will recognize any established use, for domestic and irrigation purposes, of the apportioned waters which may be impaired by the exercise of federal jurisdiction in, over, and to such waters; provided, that such use is being exercised beneficially, is valid under the laws of the appropriate state and in conformity with this compact at the time of the impairment thereof, and was validly initiated under state law prior to the initiation or authorization of the federal program or project which causes such impairment.