"No calculations are required for this credit." change to: "If graywater is collected from faucets and other sources, use the following approach to estimate the number of gallons of graywater collected per year:1. Estimate frequency-of-use for graywater sources, based on # of daily uses, duration of use, and # of occupants. See Table 2 for use assumptions to be used in this calculation. 2. Identify flow rates (GPM) for graywater sources, based on fixture specifications, etc. 3. Multiply frequency of use by flow rate to estimate total # of gallons collected per year." Table 2. Standard Fixture Usage Fixture Type Use assumptionWater closet 5 times per day per occupantShower 5 minutes per day per occupantKitchen sink faucets 4 minutes per day per occupantLavatory faucet 1.25 minutes per day per occupant