Green Plumbing

Answer: C --The rainwater harvesting conversion factor accounts for the fact that each inch of rainfall over 1,000 square feet of catchment area generates about 620 gallons of rainwater. Thus, this conversion factor of 0.62 is one of the multiplicative factors, along with actual catchment area and amount of rainfall, in determining the amount of harvestable rainwater. Humidity, barometric pressure, temperature, and evaporation rate may factor into the generated amount, but all of them are accounted for in the conversion factor.