Green Roof Runoff Calculator

They are commonly used on individual home lots to capture roof runoff.

Green roof runoff calculator.

Green infrastructure bmp options. The user can select from a wide range of bmps to determine which combination will best meet runoff reduction goals and budget considerations. The green roof energy calculator is an online tool that allows users to compare the annual energy performance of a building with a vegetative green roof to the same building with either a dark roof or a white roof. Green roofs also known as vegetated roofs.

Figure 2 shows the daily rain and associated daily green roof runoff for 1993 in state college pa for a green roof having a maximum of 1 6 inches of water retention storage. Also outlined are the steps to build your own rain barrel to collect water from your roof and downspout for all outdoor uses like watering and cleaning. Simulations are available for new construction ashrae 90 1 2004 and old construction pre ashrae 90 1 2004 office and residential buildings driven by typical precipitation and. The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff.

They consist of a layered system of roofing designed to support plant growth and retain water for plant uptake while. When these results were averaged over the 28 year simulation period a 3 5 inch. Note that there was very little if any runoff during the may 1 to sept 30 growing season. For sample purposes a 55 gallon barrel will be used.

The excel based spreadsheet is available for download from the downloads and calculators page of the green roof blocks website.