Just multiple the square footage of roof space you have available x 0 6 gallons per square foot per inch of rain and you can see how much water you can collect from each inch of rain that falls.
2000 sqft roof 1inch of rain how much water.
When you look at the numbers it s surprising how much water you can collect every time it rains.
Even though we live in the arid southwest santa fe receives an average of 14 2 inches over 66 days of rain each year.
This calculation assumes a 90 efficiency.
Use our metric system version.
How much rainwater can i collect from my roof.
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.
So if you have 2 500 square feet of roof available for water catchment and a single inch of rain falls one day we see that.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
Since one inch of rainfall provides approximately 600 gallons of water for a 1 000 square foot catchment area and our theoretical house has a 2 000 square foot catchment area twice the area you will multiply 600 gallons by 2.
Surprisingly a single quarter acre of land in the city can harvest over 100 000 gallons of water annually.
For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain.
It is the middle of july in georgia and both you and your tomatoes are wilting in your yard both looking to the sky and hoping for rain.
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.
Rainfall calculator english units how much water falls during a storm.
To find how much rain you can collect in an average rain year multiply this number by the average inches of rain.
To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above.
Rain barrel supplies list.