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He had deep knowledge of natural processes such as sedimentation.

“If we have a really hot fire that cooks the vegetation that holds the soil together, we could have increased sedimentation, debris and ash flow,” Johnson said.

For example, all five of the plant’s primary sedimentation tanks, which remove solids from wastewater, had been out of commission since March 2023.

Its existence is thought to be threatened by sedimentation, wildfires, and human developments.

Those issues include problems with the four tubes such as sedimentation and cavitation — when tiny air bubbles develop while water passes through plumbing.