Cutting-Edge Combination of Microtunnel and Circular Sump Delivers Multiple Benefits
2011
When Granger Lake was in need of an innovative concept for increased water pumping capacity, Freese and Nichols stepped in to get the job done. We introduced the Brazos River Authority (BRA) to the concept of using a circular sump for the lake located in east Williamson County.
A circular design can be built faster with a smaller footprint on the project site. In addition, it can be constructed on shore without a coffer dam or wing walls. The concept has been successful for Freese and Nichols’ previous projects, and the team was eager to deliver results to BRA.
A key innovation in this project was the integration of a microtunneled intake pipe out of the lake, a technique suited to the tight construction site conditions of Granger Lake. As a result of combining a circular sump and microtunneled intake, the team delivered multiple benefits, including:
- shorter construction time
- reduced earthwork and less dredged material
- minimal impact to existing lake boating traffic and surrounding roadway traffic
- reduced environmental impact
- lower project cost with a savings of over $3.7 million
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