All conservancy districts heretofore organized under the laws of New Mexico, and all such districts hereafter to be organized, are specifically empowered to make such proper and necessary distribution and allocation of the waters available for irrigation within such districts as the boards of directors thereof, in consultation with the chief engineer of such districts, shall determine to be reasonable and proper. The method and manner of distribution and allocation may be altered and changed as often as is deemed requisite. The decision [decisions] of said board of directors, as determined from time to time, shall be expressed in rules and regulations to be adopted and published as hereinbelow specified.