Herbie Standpipes

[Chin_Lee]

As a general rule, I think the classification of the Herbie method always incorporates an emergency standpipe; without the emergency standpipe, it would be called the "Flooding is Guaranteed Method".

I think what Harvie is asking if a standpipe is required on the primary drain in which case IME the answer is no. I close the gate valve until the water level is just slightly lower than the emergency standpipe - this minimizes the waterfall noise into the overflow.