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On average, 10 inches (25 centimeters) of snow is equal to inch (2.5 centimeters) of water. Heavy, wet snow may contain as much as 16 percent meltwater by volume. A dry, powdery snow may be as little as1/13meltwater by volume.
Sources: Ahrens, C. Donald. Meteorology Today: An Introduction to Weather, Climate, and the Environment, 5th ed., p. 212; Mineral Information Service, vol. 23 (September 1970), p. 189.
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