What Is An Acre Foot?

‘Acre foot’ is a term commonly used in water supply planning to describe water volume. An acre foot is approximately 326,000 gallons, which is enough water to cover an acre of land about 1-foot deep. As the diagram below shows, an acre foot of water is almost enough to flood a football field 1-foot deep. In North Marin Water District, an acre foot can typically meet the annual indoor and outdoor needs of three average households.