EBOM 2009 SSc6: Stormwater Quantity Control

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4 Comments

Josh Feuer Jul 30 2009

2-Year, 24 Hour Storm Data

I have found that storm data is not widely available or accessible - Has anyone found a good source?

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Jenny Carney replied Director, YRG sustainability Jul 31 2009

The best resource we've found is NOAA's Hydrometeorological Design Studies Center Precipitation Frequency Data Server: http://hdsc.nws.noaa.gov/hdsc/pfds/

For some states, the site allows you to navigate to a specific locale and generates a table of rainfall intensities, including for the 2-year 24-hour design storm. For the other states, it lets you download isopluvial maps. We'll post more info soon about how to use the tool / read the maps, but either way this resource has the data you need for any US-based project.

Mark Westover Mar 07 2010

15% Runoff determination

I want to be clear on the definition of the 15% reduction of runoff. Does this mean a 15% reduction in runoff assuming the entire property is hardscape and then you create areas or schemes to reduce runoff by 15%?
Thank you for any information.
Mark

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Tristan Roberts replied Editor – LEEDuser, BuildingGreen, LLC Mar 08 2010

Mark, you have the right general idea. To quote the credit language (shown above):

Implement a stormwater management plan that infiltrates, collects and reuses runoff or evapotranspirates runoff from at least 15% of the precipitation falling on the whole project site both for an average weather year and for the 2-year, 24-hour design stormA 2-year, 24-hour design storm is a nationally accepted rate that represents the largest amount of rainfall expected over a 24-hour period during a 2-year interval. The rate is the basis for planning and designing stormwater management facilities and features..

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