HydroLogics, Inc. presents a free units converter for common water modeling units. Length, Area, Volume, Flow, and even Hydropower estimates. Sample units include: meters, feet, miles, km, m^2, dam, hectares, acres, acre-feet, cubic meters, millon gallons per day (mgd), acre-feet per day (acf/d), cubic feet per second (cfs), cubic meters per second (cms), Kilowatt hours, acre-feet feet, cubic dekameter meter