Rain Collection Roofs

Rainwater collection calculation formulas and equations roof area ft 2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.

Rain collection roofs.

Your roof needs to be able to withstand the weight of heavy snow and rain. There s just a short list of rooftop surfaces that rainwater harvesters should avoid. Metal roofs for rainwater collection. Read down the list for info on roofing materials for rainwater harvesting.

Rain barrel supplies list. This means you can capture about 62 gallons per sq ft. To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches. Don t let all that water go to waste.

While metal roofing or plastic sheeting e g. Here s a handy little calculator to help you estimate how much rainwater can you harvest from your roof. Sample rainwater harvesting formula. 100 sq ft 62 gallons.

To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. A metal roof for rainwater collection is a prime choice especially when the appropriate paint system is incorporated. The medium sized rain water collection system. 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.

When designing a rainwater collection you have to consider its durability. 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. 50 sq ft 31 gallons. Greenhouse roof has the highest collection efficiency most surfaces are a ok.

Traditionally this involves harvesting the rain from a roof. Example for every 1 of rain. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. Research indicates rainwater is safe for irrigating vegetables read the recent research from australia and wa dept.

For every square foot of collection roof or the lid of the guzzler. 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. Water is often in short supply in the heat of summer so it s tempting to use roof runoff. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel.

Did you know the average roof collects 600 gallons 2 271 2 l of water for every inch of rainfall. When you look at the numbers it s surprising how much water you can collect every time it rains.