Gallons Of Water From Roof

To a depth of 1 in 1 hour.

Gallons of water from roof.

Rain barrel supplies list. Rainwater can be collected from the roofs using the rain water harvesting method. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area. Converting this to gallons per minute per square foot gpm ft 2.

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. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. Also outlined are the steps to build your own rain barrel to collect water from your roof and downspout for all outdoor uses like watering and cleaning. For sample purposes a 55 gallon barrel will be used.

If you capture the rainfall runoff from a storm that just produces 1 10th of an inch of rain onto a 20 by 30 foot roof you end up with a full 32 gallon container full of water with 5 gallons left over. 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. When you look at the numbers it s surprising how much water you can collect every time it rains. Easy formula to remember.

If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Take the dimensions of the footprint of your roof and convert them to inches.

A typical outdoor trash can holds 32 gallons. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. 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. Rainwater collection calculator in gallons.

In this example 600 x 240 x 1 144 000 cubic inches of water divide by 231 to get the number of gallons because 1 gallon 231 cubic inches. A service by the american water works association. Required roof drainage flow rate in gallons per minute 0 0104 x rainfall rate x roof area where rainfall rate is expressed in inches per hour and roof area is given in square feet. The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff.

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