Abstract: A temporary dam system for containing a body of water is provided. The temporary dam system is constructed with a number of dam sections. Each dam section has three or more supports and a back brace for supporting a resistant membrane backed by a plate. The supports comprise an end support, a middle support, and a top support in an A-frame structure. A membrane backing plate is attached to the front of the assembled support structure. The overall containment dam system is constructed by connecting dam sections together to form a continuous wall of rigid plates facing a body of water. A flexible liquid-impervious membrane is then placed over the rigid plates to contain the water.