I am working on a project which is a dormitory. Each living unit has a bathroom which, along with a toilet and sink, contains a combination shower/bathtub. The tub faucet and showerhead will never run at the same time, and both have a maximum 1.5 gpm flow rate.
How should I document this in the water use reduction calculator? Both fixtures are listed in our plumbing schedules so I don't want to confuse the GBCI reviewer.