The Water Use Reduction Additional Guidance document states that "When using an autocontrol faucet with metering control or automatic fixture sensor, please select the Metering Lavatory fixture in the Fixture Type pull-down menu of the Flow Fixture Data table."
I have a client that is considering a sensor activated faucet with a 0.5 GPM flow rate. When the product senses activity it allows water to flow. Water will continue to flow until the hands are removed or until 2 minutes - the time out limit. It would seem more appropriate to use 0.5 GPM as the flow rate instead of a metered amount, since the water stays on essentially the whole time a person is washing their hands. If I had to use the meter type, then wouldn't I have to use 2 minutes as the default duration when calculating the flow per cycle?