Dewatering and Groundwater Control

Boardman Dam removal

Boardman Dam removal

Scope

Michels designed, furnished and installed a siphon system to draw down water elevation in a pond impoundment area and maintain upstream river flow during the removal of a high-risk dam. The system consisted of 14 30-inch HDPE siphons, flow-monitoring meters, stainless steel knife gate valves and a priming system. During drawdown, the system bypassed 179,000 gallons per minute. Once the level was lowered 12 feet to the required elevation, the system maintained a river flow of 125,000 gallons per minute plus any additional water inflow caused by weather to prevent recharge of the impound area. The month-long 24/7 operation and monitoring process maintained proper upstream river levels. Once siphons were no longer needed, all equipment had to be dismantled, loaded up and off site within a 15-day period.

Projects

Michels Dewatering group was tasked to design, install and operate a system to divert peak flows of up to 168,000 gallons per minute, or 242 million gallons per day, so that a pipeline could be open cut in dry conditions across the Conotton Creek.

Dewatering and Groundwater Control

Conotton Creek Diversion

Ohio

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Conotton Creek Diversion

Michels developed a diversion plan for Hay Creek to allow a pipeline crew to perform an anomaly dig to repair an imperfection of a high-pressure pipeline that crossed the creek.

Dewatering and Groundwater Control

Hay Creek Stream Diversion

Wisconsin

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Hay Creek Stream Diversion

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