af  – acre-feet, = 325,851 gallons or 43,560 cubic feet

afa  – acre-feet per annum (year)

BTU  – British Thermal Unit

ccf  – Hundred cubic feet = 748 gal.

cf – Cubic feet = 7.48 gal.

gal  – Gallons, 1 gallon = 0.134 cubic feet

gcd  – Gallons per capita per day

gpcd  – Gallons per capita per day

gpd  – Gallons per day

gpf  – Gallons per flush (of a toilet or urinal)

gpm  – Gallons per minute

gpsf  – Gallons per square foot

hcf  – Hundred cubic feet = 748 gal.

hr  – Hours

kgal  – One thousand gallons = 134 cubic feet

kWh  – Kilowatt-hours

l  – Liters

lcd  – Liters per capita per day

lpf  – Liters per flush (of a toilet or urinal)

MG  – Million gallons

mgd – Millions of gallons per day

MG/yr – Millions of gallons per year

min – . minute

psi  – Pounds per square inch

sf  – Square feet