According to Montana Resources, about twice as much water evaporates off the surface of the Pit each year than enters the Pit through rain and snow. About 12 inches of precipitation fall into the Pit each year, and about 23.65 inches evaporate, for an annual net loss from evaporation of roughly 11.65 inches. This water balance translates into an annual average of about 20,000 gallons per day of evaporating water.

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