covering an area of 1 acre; it equals 325,843 gallons or 43,560 cubic feet. bgd -billion gallons per day. cfs -cubic feet per second; one cfs is equivalent to 646,315 gallons per day. cfsm -cubic feet per second per square mile of drainage-basin area. DNR -Iowa Department of Natural Resources. gpm -gallons per minute. mgd -million gallons per day. mgpy -million gallons per year. mg/1 -milligrams per liter or parts per million.Hg/1 -micrograms per liter or parts per billion.
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