The proprietors of any ditch, conduit, reservoir or other works for the diversion, carriage, retention or storage of waters may procure the waters to which they are entitled, to be carried, stored and distributed from and through like works of any other proprietor upon such terms as may be agreed upon between them without in any manner impairing or affecting their right of priority in respect of such waters: Provided, however, That thereby the waters supplied to any consumer be not diminished.