Jp
Thanks for the response, I appreciate the PB family helping me with this issue. There has been no changes or modifications to the siphon since it was installed ( about 4 years ago). As far as I can tell water has never run over the emergency spillway. While it is definitely possible the siphon has acted as an overflow pipe over the years, I am still at a loss as to what changed to cause the BOW to drain down to the siphon intake, refill and repeat.
Cliff
