Green Roof Runoff Calculator

For sample purposes a 55 gallon barrel will be used.

Green roof runoff calculator.

They are commonly used on individual home lots to capture roof runoff. They consist of a layered system of roofing designed to support plant growth and retain water for plant uptake while. The user can select from a wide range of bmps to determine which combination will best meet runoff reduction goals and budget considerations. The system outlined below will walk you through the steps of determining your rain barrel sizes based on average roof runoff.

When these results were averaged over the 28 year simulation period a 3 5 inch. Conventional development site conditions including roof size parking lot area and street sidewalk and driveway area. To help further promote green roof projects in the united states we decided to make our water runoff calculator tool available free of charge. Green roofs also known as vegetated roofs.

Green infrastructure bmp options. Bioretention systems placed on roof surfaces that capture and temporarily store rainwater in a soil medium. The excel based spreadsheet is available for download from the downloads and calculators page of the green roof blocks website. 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.

Note that there was very little if any runoff during the may 1 to sept 30 growing season.