In addition to the powers conferred upon the commission to sell, lease and otherwise dispose of waters for the purpose of irrigation, development of power, watering of stock or other purposes, the commission shall have power to sell, lease and otherwise dispose of waters from its waterworks systems for public, domestic, industrial and other uses and for fire protection. The commission, after the discharge of all of the bonds issued by the commission to finance the construction or acquisition of any works, except for hydrographic surveys used by the state engineer for determining water rights, and of all interest thereon and costs and expenses incurred in connection with any action or proceeding by or on behalf of the holders of such bonds, shall reconvey the same to the grantors thereof.