Rain Collection Roofs

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

Rain collection roofs.

Here s a handy little calculator to help you estimate how much rainwater can you harvest from your roof. 100 sq ft 62 gallons. Research indicates rainwater is safe for irrigating vegetables read the recent research from australia and wa dept. Sample rainwater harvesting formula.

The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater collection in washington state outlines the department of ecology s 2009 policy decision allowing rainwater collection and reuse systems and has many useful links. Read down the list for info on roofing materials for rainwater harvesting. While metal roofing or plastic sheeting e g.

To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches. 50 sq ft 31 gallons. Your roof needs to be able to withstand the weight of heavy snow and rain. Rainwater collection systems can be as simple as collecting rain in a rain barrel or as elaborate as harvesting rainwater into large cisterns to supply your entire.

A metal roof for rainwater collection is a prime choice especially when the appropriate paint system is incorporated. When you look at the numbers it s surprising how much water you can collect every time it rains. Rain barrel supplies list. Did you know the average roof collects 600 gallons 2 271 2 l of water for every inch of rainfall.

When designing a rainwater collection you have to consider its durability. Greenhouse roof has the highest collection efficiency most surfaces are a ok. This means you can capture about 62 gallons per sq ft. You can make a rainwater collection system for under a hundred dollars and store hundreds of gallons of water to use for your garden or other purposes.

To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. For every 1 of rain and 100 square feet of impermeable surface about 62 gallons are generated. Collecting the rainwater that runs off your roof is a great way to conserve an important natural resource. The medium sized rain water collection system.

Rainwater collection calculation formulas and equations roof area ft 2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. Water is often in short supply in the heat of summer so it s tempting to use roof runoff. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. 1 of rain on 1 000 sf roof will yield 623 gallons.

Example for every 1 of rain. For every square foot of collection roof or the lid of the guzzler.