Interval: A scale that represents quantity and has equal units but for which zero represents simply an additional point of measurement is an interval scale. The Fahrenheit scale is a clear example of the interval scale of measurement. Thus, 60 degree Fahrenheit or -10 degrees Fahrenheit represent interval data.
Convert Gallons to Acre-feet: Divide Gallons by 325,851. Example: An 800,000 gallon pond = 2.46 acre feet. Convert Acre-feet to Gallons: Multiply Acre-feet by 325,851. Example: A 5 acre-foot pond = 1,629,255 gallons. Background. One acre-foot is equivalent to one-acre of water that is one-foot deep. An acre is a measure of surface area that totals 43,560 square feet. An acre can be of any shapeâa rectangle, a triangle, a circle, or even a starâso long as its area is exactly 43,560 square feet.
But what is an acre-foot? One acre-foot equals about 326,000 gallons, or enough water to cover an acre of land, about the size of a football field, one foot deep. An average California household uses between one-half and one acre-foot of water per year for indoor and outdoor use. California receives about 193 million acre-feet of water each year as precipitation (rain and snow), but there is great variability between regions.