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 .