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Boil Holes

A boil hole looks like a sinkhole. In a shallow karst setting—where the underground river is about 30 feet down—floodwater boils up from underground like a fountain or geyser. Boil holes can open suddenly, just like sinkholes. If the sewage treatment plant were to be built inside a floodwall, boil holes can erupt anywhere within the perimeter, even if a dike could prevent a flood from the surface river. Flowing water can undermine structures, such as 15 million pound raw sewage tanks.

This boil hole is against the edge of Middle Mountain, just across Route 219 from the proposed contruction site.

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