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The naturalist's latest documentary Ocean With David Attenborough showed new footage of a bottom trawling net bulldozing through silt on the seafloor and scooping up species indiscriminately.

However, it could now flush silt from its reservoirs without prior warning - potentially causing damage downstream in Pakistan.

Regional Water Quality Control Board found that the charred silt does not contain wildfire-related chemicals at levels considered to be dangerous to human health, the health department concluded.

I wanted to show her what I learned: that we are never alone among the tadpoles, silt and stones, that we belong to nature too.

Municipal wells typically draw drinking water from hundreds of feet underground, often tapping into aquifers that lie beneath impermeable clay and silt layers called aquitards.