Yeah, California gold rush people were using high pressure water canons in the 1800s, just blasting off the sides of mountains away, what finally got the state to put a stop to it, the silt and debris from the mountains were causing flooding downriver, causing fatalities. One of these places in a state park now (maybe Yes_Justice would know which one it is).
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Date: 15/11/14 03:42 (UTC)