I have seen several forms of the formula to predict the next eruption of the Old Faithful Geyser in Yellowstone park, of the form
T = a D +b,
where T is the Time to next eruption in minutes, D is the duration of last eruption in minutes. The coefficients a and b are typically 10-12.5 and 30-35 respectively.
But the actual formula used takes also into account the height of the last eruption in feet. Can someone give me a reference for that formula?
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