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No best answer has yet been selected by Gnisy. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I remember reading this but I cannot remember the source as it was several years ago.
There was a dam and when there was a lot of rainfall they had to put the pumps on to reduce the water level in the reservoir to reduce the pressure in the dam. The pumps maximum tested rate was (for example) 12 gallons per second (or more likely 12,000 gallons per second but you get the idea).
One time there was a huge deluge over several days and there was a strong possibility of the dam bursting and several villages being washed away. So they put the pumps on faster than they had ever done before up to the absolute maximum of 19 (or 19,000) gallons per second.
Like every good fairy tale the dam (and the villages) were saved.
But when the story was retold people would say that they were pumping 19 instead of 12 gallons per second.
This soon became 19 to the dozen to imply a rapidity that was above the norm.
Hope this helps.