The volume of water represented by a flow of one cubic foot per second for 24 hours. It equals 86,400 cubic feet, 1.983471 acre-feet, or 646,317 gallons.
CUBIC FEET PER SECOND DAY (CFS-DAY)
Meaning of CUBIC FEET PER SECOND DAY (CFS-DAY) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012