Obviously, there is going to be a large amount of variability, but what are some realistic values?

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    $\begingroup$ Are you interested in gas volume or particulate throughout/deposition? $\endgroup$ – Ash May 28 '18 at 15:23
  • $\begingroup$ I'm more interested in gas volume. $\endgroup$ – g.z. May 29 '18 at 19:10

Surprisingly enough most of the figures I could find were actually about thermal output but back working the figures, and assuming I read the formulas properly (not guaranteed I'm afraid) it looks like 5-7 litres per second is the ballpark average gas flow based on fifty years worth of data from several fumarole fields in the central North Island of New Zealand. I have no idea how representative that figure would be of fields elsewhere.

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