How Much Rain Water Will Roof Collect

The answer is about 623 gallons.

How much rain water will roof collect.

1 of rain on 1 000 sf roof will yield 623 gallons. If you have 1 000 square feet of roof on your house and it rains just 1 inch you can collect 600 gallons of water to be used in your garden for washing your car or just for drop irrigation around your property. Rainwater can be collected from the roofs using the rain water harvesting method. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above.

Take the dimensions of the footprint of your roof and convert them to inches. An average suburban roof of 200m 2 with such a rain fall can potentially harvest 100 000l of rainwater 200m 2 500mm 100 000l. Collected rainwater may be used to irrigate outdoor lawns plants or gardens. Colorado the state with arguably the strictest rainwater harvesting laws passed a bill in 2016 allowing for the collection of rainwater with a 110 gallon maximum capacity.

Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater collection calculation formulas and equations. Any container capable of collecting the rain shedding from a roof or patio can be used as a rainwater harvesting system.

Rainwater harvesting is collecting the run off from a structure or other impervious surface in order to store it for later use. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Traditionally this involves harvesting the rain from a roof. Roof area m2 x precipitation amount mm amount collected liters.

Untreated rainwater collected from roofs is not safe to drink. To calculate the runoff from any given rainfall. When you look at the numbers it s surprising how much water you can collect every time it rains. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.

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. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area. Keep in mind most rain falls over 2 3 months of a year.

For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. To comply with colorado water law the container must be equipped with a sealable lid.