Rainwater Off Roof

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.

Rainwater off roof.

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. Posted on january 7 2010 by orpheus. Greenhouse roof has the highest collection efficiency most surfaces are a ok. Roger cook evaluates a couple alternatives for moving rainwater effectively.

Rainwater collection calculation formulas and equations. And this is when it is operating at its least efficient rate of purification at 32 degrees f. While metal roofing or plastic sheeting e g. If you have heavy runoff from roof downspouts and neighboring properties redirecting or capturing runoff can provide better control.

To calculate the runoff from any given rainfall. New information is available about rainwater harvesting from composition roofs. The following approaches to redirect and capture runoff can be used to control heavy runoff causing prolonged wet areas or yard erosion. There are times when it rains especially during big storms that water cascades off of a roof like a waterfall.

While this is a normal aspect of roofing and gutters water that pours off of a. Read down the list for info on roofing materials for rainwater harvesting. 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. Take the dimensions of the footprint of your roof and convert them to inches.

There s just a short list of rooftop surfaces that rainwater harvesters should avoid. Today houses are built with roof gardens that naturally absorb the rain and grow an insulating layer of grass. The answer is about 623 gallons. These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area.

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. Harvesting rainwater from a composition asphalt roof. Roof area m2 x precipitation amount mm amount collected liters. 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.

1 of rain on 1 000 sf roof will yield 623 gallons. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. The good news is most roofing materials are suitable for rainwater harvesting.