second-day-foot

second-day-foot
(sdf)
   a unit of volume for water sometimes used in U.S. hydrology. A second-day-foot is the volume of water accumulated in one day by a flow of one cubic foot per second; this is equal to exactly 86 400 cubic feet or about 2446.58 cubic meters. One second-day-foot is equivalent to approximately 1.9835 acre feet. Also known as the day-second-foot (dsf).

Dictionary of units of measurement. 2015.

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