Green Roof Water Harvesting System

To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches.

Green roof water harvesting system. Green roof systems are one of the best ways to manage stormwater runoff by reducing and delaying. So for example a 100m2 london roof pitched might send 52m3 of water to the tank per year. The elmich green roof demonstrates how such a green roof can contribute to. I am glad the article has been covered so well because it brings concerns to the quality of rainwater and stirs up questions about materials used in each system.

Extensive green roofs potsdammer platz berlin rainwater harvesting. However there are two issues. Rainwater harvesting is a very simple process. Here s a handy little calculator to help you estimate how much rainwater can you harvest from your roof.

But if it was a green roof this would fall to only 23 3m3. The amount of water available to a rainwater harvesting system is about 90 for pitched roofs and around 75 for flat roofs. By using green roofs as rainwater capture areas the amount of collected water for reuse will be reduced already due to the absorbed amount of water in the system itself. There s just a short list of rooftop surfaces that rainwater harvesters should avoid.

Rather than the rain running off the roof into the gutter and into the drainage system the tank will catch filter and store this water for non drinking uses allowing us to make use of surface water before it taking up valuable space in our sewer systems. Green roofs vegetated roofing roof gardens rain gardens bioretention rainwater collection rain water harvesting. While metal roofing or plastic sheeting e g. The good news is most roofing materials are suitable for rainwater harvesting.

For green or even brown roofs the amount is 40 at best. Rainwater harvesting is the collection and storage of rainwater that would otherwise go to the drains or into the ground. Greenhouse roof has the highest collection efficiency most surfaces are a ok. Versidrain 25p drainage and water retention trays installed on the 120 sq m elmich green roof blanketed over with geotextile fabric enabled enviromix a lightweight primarily inorganic planting media to be placed on the trays for planting on the green roof and ramp.

In fact it is quite common to harvest water from green roofs in germany and switzerland. I am responding to the january 31 2010 texas water development board article effect of roof material on water quality for rainwater harvesting systems that has been resurfacing around the internet lately. Furthermore it is possible utilise rainwater harvesting of a green roof contrary to claims from other industries. Rainwater harvest calculator length.

This water can then be reused around the house and garden.