Portfolio Manager tracks water meters based on the water source. There are four types of water meters available:
Water use is measured in gallons. This data comes from water bills that are entered in Portfolio Manager. The calculated number of gallons used is then divided by the building’s square footage. The result is the building’s Water Use Intensity (WUI).
To calculate the water percentage difference over the competition year, WUI from the previous year is subtracted from the WUI of the current year. The calculated difference is how we determine the biggest loser.
WUI = gallons/square footage
Current Year – Prior Year = % lost or gained