One of the projects outlined in the City of Omaha, Nebraska's combined sewer overflow (CSO) long-term control plan crossed the Lauritzen Botanical Gardens, a living museum of unique four-season plant displays. The Gardens had been constructed over a closed, solid waste balefill. The combined sewer was located under the balefill more than 800-feet below grade. The weight from the balefill had crushed the existing combined sewers, allowing leachate into the sewer system. Additionally, the drainage system had failed, allowing stormwater to flow into the balefill. How did they solve this complex problem? They developed an innovative solution involving a pipe bridge over the balefill and using four types of trenchless construction. Learning Objectives: Determine how to evaluate various trenchless construction methods for sewer installations. Evaluate the use of auger cast displacement for crossing a landfill. Examine how a storm sewer can be designed to be a pipe bridge.
Contributor/Source
Chris Koenig
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