Rainwater Off Roof

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.

Rainwater off roof.

New information is available about rainwater harvesting from composition roofs. Posted on january 7 2010 by orpheus. Today houses are built with roof gardens that naturally absorb the rain and grow an insulating layer of grass. 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.

Fumes from industry and traffic. While metal roofing or plastic sheeting e g. Harvesting rainwater from a composition asphalt roof. And this is when it is operating at its least efficient rate of purification at 32 degrees f.

The good news is most roofing materials are suitable for rainwater harvesting. Greenhouse roof has the highest collection efficiency most surfaces are a ok. 1 of rain on 1 000 sf roof will yield 623 gallons. There are times when it rains especially during big storms that water cascades off of a roof like a waterfall.

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. Roger cook evaluates a couple alternatives for moving rainwater effectively. There s just a short list of rooftop surfaces that rainwater harvesters should avoid. The answer is about 623 gallons.

These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area. Rainwater collection calculation formulas and equations. Roof area m2 x precipitation amount mm amount collected liters. Take the dimensions of the footprint of your roof and convert them to inches.

While this is a normal aspect of roofing and gutters water that pours off of a. 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. 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. The following approaches to redirect and capture runoff can be used to control heavy runoff causing prolonged wet areas or yard erosion.

Read down the list for info on roofing materials for rainwater harvesting. 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. To calculate the runoff from any given rainfall.