How Much Rain Water Runs Off Your Roof?

You may be as astonished as we were to learn how much water runs off a roof in a rain storm!

Take a guess--what is the volume of water that runs off a 1,000 square foot roof during a 1" rain storm?

20 gallons? 50 gallons? 100 gallons? 1000 gallons?

The answer is about 623 gallons.

To calculate the runoff from any given rainfall: