Gallons Of Water From Roof

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.

Gallons of water from roof.

Rainwater collection calculator in gallons. To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. The first few gallons of water that runs off the roof contain the majority of the contaminants and setting it aside makes the rest of the water safer. Convert the amount of rain from cubic inches into gallons.

1 of rain on 1 000 sf roof will yield 623 gallons roof area m2 x precipitation amount mm amount collected liters other water conservation calculators. For sample purposes a 55 gallon barrel will be used. When you look at the numbers it s surprising how much water you can collect every time it rains. To calculate the runoff from any given rainfall.

Rainwater can be collected from the roofs using the rain water harvesting method. Converting this to gallons per minute per square foot gpm ft 2. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. 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. In this example 600 x 240 x 1 144 000 cubic inches of water. There are 231 cubic inches of water in a gallon so using our example above divide cubic inches by 231 and you have a total runoff of approximately 1870 gallons of water or 432 000 231 1870 129.

The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area. Give your rain barrel a thorough scrub at. Take the dimensions of the footprint of your roof and convert them to inches. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain.

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. To a depth of 1 in 1 hour. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water.

The answer is about 623 gallons.