GW: I started the pond dam piping thread that asked when the syphon action started working. My outlet pipe is exactly as you drew it on your Feb. 27 post in this thread. Last Monday my 10 inch automatically started to syphon during a long heavy period of rain. I had recently repaired by damaged spillway and was worried it would be damaged again. No problem. The sypone stopped the rise of water in about 15 minutes and brought it down over the next two hours even though 75 acres of watershed was draining into this 2 acre pond. The syphon stopped by itself at the point the vent pipe lost its water coverage. There is no question that the volume of water moved by the syphon action is tremendous. I think my emergency spillway problems are solved. I hope Jersey's two 12 inch sypons start when needed.
Rockcreek
