If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.
Rain fell from a roof.
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Take the dimensions of the footprint of your roof and convert them to inches.
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You might even want to know how many baths you could get from your rainstorm.
Although this calculation is simple in principle the units can make it a headache.
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For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain.
To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above.
To find how much rain you can collect in an average rain year multiply this number by the average inches of rain.
In the form below choose an area s and a rainfall amount to see how many gallons of water fell from the sky onto that area.
Easy formula to remember.
However there is a way that you can redirect the rain off the roof so it falls harmlessly out of the way.
The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area.
To calculate the runoff from any given rainfall.
The catchment areais multiplied by the depth of rain that falls on it to give the total volumeof waterproduced.
A service by the american water works association.
1 place a piece of standard metal drip edge onto a table or between a pair of sawhorses.
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.
In this example 600 x 240 x 1 144 000 cubic inches of water.
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1 of rain on 1 000 sf roof will yield 623 gallons roof area m 2 x precipitation amount mm amount collected liters other water conservation calculators.
The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff.
Anyone can begin the process of turning a home or business green by making and installing a basic rain barrel.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
A simple rain catchment system can provide water for outdoor use resulting in a lower water bill.
Rainwater can be collected from the roofs using the rain water harvesting method.
Factors such as evaporation wetting and soaking into the ground are not considered here.
