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Little Blue River study outlines major regional costs, local impacts and proposed dry basins
Summary
A U.S. Army Corps of Engineers-led study identified reduced channel capacity and rising flood risk in the Little Blue watershed. Tentatively selected plans include dry detention basins and stream restoration; estimated construction costs are large and would require multi-jurisdictional local cost-sharing or congressional action.
George Binger, city engineer, briefed the Public Works Committee on Feb. 10 on the Little Blue River flood risk mitigation and ecosystem restoration study being coordinated with the U.S. Army Corps of Engineers and multiple jurisdictions.
Binger said the Corps' updated modeling shows the channel has lost roughly one-third of its conveyance capacity since the original study in the 1970s, raising water-surface elevations by about two feet in portions of the watershed. "The channel has lost about a third of the capacity over time," he told the committee, and that rise in water surface can bring floodwaters into low-lying buildings in the Oak Ridge…
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