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.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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