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How long do you want the surge to last? 15-30 seconds would be doable here. Or longer if you prefer.
200 gallon in 15 sec -> 48000gph
Plug that into the drain calculator on RC's homepage -> 9.05in diameter
200 gallon in 30 sec -> 24000gph -> 6.4" dia
But you'll get a little higher flow and thus shorter surge due to the head height inside the container. I'd go with a 4 or 6" pipe with a flapper design. That way you won't have to worry about starting a siphon or having as many air bubbles.
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