Backwater 4 : Natural Disaster. The rise in water surface elevation caused by some obstruction such as a narrow bridge opening, buildings, or fill material that limits the area through which the water must flow
Ohio Floodplain Management Handbook (A Resource Handbook for Local Officials to Administer Flood Damage Reduction Regulations), Acronyms and Definitions Provided To Familiarize The Reader With Some Common Terms Used In Floodplain Management, OH, USA (Rev.) 2005. http://www.dnr.state.oh.us/Portals/7/floodpln/oh_f loodplain_handbook.pdf, (ND/ Flood - Amer) {453}