The average house is 2000 square feet and the average rain fall in Barberton yearly is 39 inches. This mean an average roof will produce 48,425 gallons of runoff every year!
There are approximately 12,000 houses in Barberton. If we collected all the runoff in a year from all those houses, we would have about 581,100,000 gallons of water! That is enough water to supply Barberton for 145 days!