Thanks for the detailed information DC70! This has been a great help in trying to find a buried bottom spillway siphon system that anyone can use as a guide. Can anyone answer the question I raised previously in a post? “ I was wondering if I needed a check valve above the TEE on the vertical pipe between the TEE and the surface cap in order for the automatic and manual siphon to start?”
Thanks!
Heppy
No, you don't. The vertical pipe (I assume you mean the vent supply pipe) should always be at atmospheric pressure to rise and lower as the pond does. Once you close a valve on the vent pipe itself, the siphon will drain until you reopen the valve, or there is no more water...
