Rainwater Off Roof

Roof area m2 x precipitation amount mm amount collected liters.

Rainwater off roof.

There are times when it rains especially during big storms that water cascades off of a roof like a waterfall. The answer is about 623 gallons. If you have heavy runoff from roof downspouts and neighboring properties redirecting or capturing runoff can provide better control. You have to admit that whether you re in a drought situation or not it s hard to pass up that much of a free thing.

Harvesting rainwater from a composition asphalt roof. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. Today houses are built with roof gardens that naturally absorb the rain and grow an insulating layer of grass. If you get about 10 inches of rain over the course of the spring and summer an average 1 360 square foot roof would yield 8 160 gallons of rainwater.

Take the dimensions of the footprint of your roof and convert them to inches. Rainwater runoff from your roof contains a mix of materials deposited by pollution and animals as well as chemicals used in the manufacture of the shingles. The following approaches to redirect and capture runoff can be used to control heavy runoff causing prolonged wet areas or yard erosion. There s just a short list of rooftop surfaces that rainwater harvesters should avoid.

The good news is most roofing materials are suitable for rainwater harvesting. Collecting rainwater is a technique that has been practiced for centuries as an environmentally friendly method to collect rain for distribution in gardens and across landscaping. Fumes from industry and traffic. New information is available about rainwater harvesting from composition roofs.

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Greenhouse roof has the highest collection efficiency most surfaces are a ok. To calculate the runoff from any given rainfall. How to divert water without gutters or downspouts everyone knows the importance of diverting water away from a house but sometimes a traditional gutter and downspout simply won t work.

1 of rain on 1 000 sf roof will yield 623 gallons. And this is when it is operating at its least efficient rate of purification at 32 degrees f. Read down the list for info on roofing materials for rainwater harvesting. Roger cook evaluates a couple alternatives for moving rainwater effectively.

While this is a normal aspect of roofing and gutters water that pours off of a. 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 collection calculation formulas and equations.