Coffer Dam : A temporary structure enclosing all or part of a construction area so the construction can proceed in a dry area. A "diversion coffer dam" diverts a river into a pipe, channel, or tunnel
State of Nevada Division of Water Resources (NDWR), Dam Safety - Glossary of Terms, NV, USA 2013. http://water.nv.gov/engineering/Dams/Glossary.cfm, (Dam Sfty - Amer) {891}