Lake & Dam Engineering for Fairwood Hills Estates
LOCATION: O’Fallon, IL
CLIENT: Fairwood Hills Estates Homeowner’s Association
TWM provided lake and dam engineering services for this project at the Fairwood Hills Estates. We designed the replacement of the principal spillway system for the 30-foot high and 475-foot long Class I earthen fill dam for Fairwood Hills Estates in O’Fallon, Illinois. The surface area of the lake is 16.4 acres, and serves a 363-acre watershed. The lake impounds approximately 193 acre-feet of water. The principal spillway is a 78-inch concrete drop inlet spillway which discharges to a 60-inch reinforced concrete outlet pipe. Among TWM’s tasks: topographic survey; hydrologic / hydraulic analysis; design of the drop inlet principal spillway structure; design of the impact stilling basin.