It shall be lawful for all corporations and individuals owning or controlling lands on both sides of any nonnavigable stream to construct and maintain a dam or dams, together with canals and appurtenances thereof, across the stream for the development of water power and for other purposes; provided, however, this Code section shall not be construed to release individuals or corporations constructing such dam or dams and appurtenant works from liability to private property owners for damages resulting from the construction and operation thereof either by overflow or otherwise.