Rainwater Off Roof

Harvesting rainwater from a composition asphalt roof.

Rainwater off roof.

And this is when it is operating at its least efficient rate of purification at 32 degrees f. Fumes from industry and traffic. 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. There are times when it rains especially during big storms that water cascades off of a roof like a waterfall.

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Roger cook evaluates a couple alternatives for moving rainwater effectively. New information is available about rainwater harvesting from composition roofs.

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. Take the dimensions of the footprint of your roof and convert them to inches. 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. To calculate the runoff from any given rainfall.

Greenhouse roof has the highest collection efficiency most surfaces are a ok. Read down the list for info on roofing materials for rainwater harvesting. 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.

Rainwater collection calculation formulas and equations. These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area. Today houses are built with roof gardens that naturally absorb the rain and grow an insulating layer of grass. While metal roofing or plastic sheeting e g.

Posted on january 7 2010 by orpheus. The following approaches to redirect and capture runoff can be used to control heavy runoff causing prolonged wet areas or yard erosion. 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.

Roof area m2 x precipitation amount mm amount collected liters. The answer is about 623 gallons. 1 of rain on 1 000 sf roof will yield 623 gallons.