Gallons Of Water On Roof

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.

Gallons of water on roof.

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. A typical outdoor trash can holds 32 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. 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. An online drip calculator that calculates the amount of waste from your leaky faucets. Converting this to gallons per minute per square foot gpm ft 2. Can you get enough water out of the gutter to make it worthwhile.

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. To a depth of 1 in 1 hour. 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. 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.

For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Rainwater collection calculator in gallons. 1 inch of rainfall in an hour will cover 1 sq ft. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.

Take the dimensions of the footprint of your roof and convert them to inches. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. Easy formula to remember. A service by the american water works association.

Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. When you look at the numbers it s surprising how much water you can collect every time it rains. The answer is definitely yes. Rain barrel supplies list.