Having worked whit industrial plumbing for 10 years. We would us a check valve with a damper to eliminate this problem. A damper being key. frank

On 1/29/2022 7:39 PM, Hilton Dier wrote:
You have 300’ of head on one side of the crest and 700’ on the other. That’s 
129 psi on one side and 301 psi on the other. Turn either of those pressures 
into suction and water would boil at room temperatures. Aside from pipe 
strength, any siphon would be limited by that.

Hilton Dier III
Renewable Energy Design
Missisquoi River Hydro LLC
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