Gallons Of Water Per Square Foot Of Roof
To calculate the runoff from any given rainfall.
Gallons of water per square foot of roof. 1 inch of water over a 5000 acre area equals 135 771 500 gallons. Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. Either way you would like to know how much rain has fallen how many gallons have come down from the skies onto your roof yard block or town.
So a 50 x 20 roof is 600. So if they drain 23 million gal. Take the dimensions of the footprint of your roof and convert them to inches. Per day it would take just short of 6 days to lower the level by 1 inch.
If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year. The answer is about 623 gallons. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. When you look at the numbers it s surprising how much water you can collect every time it rains.
For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Or maybe a low pressure cell has been napping overhead and your arm is hurting from holding that umbrella while you watch your basement fill up with water.