How to calculate 2 year 24 hour design storm?
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NC-2009 SSc6.1: Stormwater Design—Quantity Control
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2 year 24 hour design storm
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FAQs about SSc6.1:
Why do the requirements focus on 1-year and 2-year, 24-hour storms?
How can green roofs count as a stormwater control measure?
I have 100-year data—how do I convert to 2-year?
Are there special considerations for international projects?
What performance threshold do I need to achieve for an Exemplary Performance point?
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
December 16, 2015 - 10:53 am
The rainfall used for a design storm is based on historical rainfall amounts for the region in question. This is typically a "lookup" from a local weather agency (NOAA in the US), and not typically something you would be calculating.
ABDUL MUTHALIB MOHAMED
INNOWELL ENGINEERING INTERNATIONAL PVT LTD3 thumbs up
December 16, 2015 - 1:13 pm
Hi Michael....
The Project is in Bangladesh...Not U.S.
The Bangladesh Metro-logical Department lists month-wise Average Normal Rainfall in mm .
For Dhaka following are the Values
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
7.7 29 66 156 339 340 373 316 300. 172 34.4 12.8
Kindly tell us how to calculate 2 year 24 hour storm from above values?
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
December 16, 2015 - 1:28 pm
You do not have enough data to discern anything from what you have posted. What you are trying to do is not easy, and is well outside the scope of this forum.
I suggest you read this: http://www.eng-tips.com/viewthread.cfm?qid=399896
Gustavo De las Heras Izquierdo
LEED Expert185 thumbs up
December 16, 2015 - 8:34 pm
Depending on the rainfall data available in your country you might prefer to use the v4 methodology (95% percentile)
Omar Elrawy
Green Building Consultant | ResearcherGreenA Consultants
56 thumbs up
December 20, 2015 - 7:55 am
ABDUL MUTHALIB,
The requirements for an alternative compliance for projects outside of the United States can be found in the LEED BD+C v2009 Reference Guide with Gobal Alternative Compliance. You will also need to update your LEEDOnline form to be able to use the Alternative Compliance Path (ACP).