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That calculates out to about 40 gallons per minute which would be a pretty small discharge. The amount of water coming out of a discharge can not tell you how much of the mine is flooded. Once the mine floods to the point of the lowest surface opening, water comes out, how much water depends on the size of the flooded area and how much surface water is being captured by the minepool.
How much of the mine is flooded depends on the elevation of the discharge. if the discharge is a drainage tunnel driven into the lower levels of the mine, much of the mine might be above water, if the discharge is a slope or a airhole most of it will be flooded.
Although, some discharges are above the minepool, usually these are smaller discharges; they intercept minewater before it reaches the level of the minepool. The water from some of these discharges end up going back underground so they will not show up on any AMD discharge list.
Which discharge are you looking at?
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