Rainwater Off Roof

There s just a short list of rooftop surfaces that rainwater harvesters should avoid.

Rainwater off roof.

The following approaches to redirect and capture runoff can be used to control heavy runoff causing prolonged wet areas or yard erosion. The good news is most roofing materials are suitable for rainwater harvesting. 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.

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. 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. If you have heavy runoff from roof downspouts and neighboring properties redirecting or capturing runoff can provide better control.

Roof area m2 x precipitation amount mm amount collected liters. Rainwater collection calculation formulas and equations. Greenhouse roof has the highest collection efficiency most surfaces are a ok. And this is when it is operating at its least efficient rate of purification at 32 degrees f.

1 of rain on 1 000 sf roof will yield 623 gallons. 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. 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 answer is about 623 gallons.

While metal roofing or plastic sheeting e g. To calculate the runoff from any given rainfall. Fumes from industry and traffic. Posted on january 7 2010 by orpheus.

Harvesting rainwater from a composition asphalt roof. These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area. 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. Read down the list for info on roofing materials for rainwater harvesting.

New information is available about rainwater harvesting from composition roofs. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. There are times when it rains especially during big storms that water cascades off of a roof like a waterfall.