To better understand the calculation methodology, let's assume a one-story building, with two restrooms. The men's room has two urinals, and two closets. The women's restroom has four closets. Each restroom has two sinks with a manual faucet on each sink. There are 100 people who occupy the building during office hours: 50 men, and 50 women.

Stain-, chemical- and heat-resistant solid-surface lavatory systems with low-consumption sensor-operated faucets are easy to maintain and provide hands-free, hygienic operation.

Creating the Baseline

Create a spreadsheet listing each water-using fixture, and the frequency of use data. Frequency of use data includes number of female and male daily uses, duration of use, and the water volume use. There is no set criteria for determining daily use or duration of use, so architects can estimate these items based on the project's program requirements. These values are used to calculate the TOTAL POTABLE WATER used for each fixture type and gender. Use EPAct fixture flow rates for the baseline case. Do not change the number of building occupants, work days or frequency data from baseline to design case. In addition, graywater or rainwater harvest volumes must not be included in baseline calculations.