TWM offers lake and dam engineering solutions to clients in the greater St. Louis region including Southern Illinois. For this project, we designed a new earthen dam embankment, drop inlet principal spillway, emergency earthen channel overflow spillway, energy dissipator structure, and outfall channel to replace a deteriorated earthen dam / spillway structure. Design included HEC-1 hydrologic/hydraulic analysis and a dam breach analysis using HEC-RAS. An emergency action plan was also prepared for use by local ESDA agencies, and the lake was designed with storage to provide storm water detention for the development that is proposed to encompass the watershed of the lake. Permitted as a Class I, small size dam by IDNR-OWR.
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