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 LTD

LEEDuser Basic Member

2 thumbs up

Wed, 12/16/2015 - 18:13

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 Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Wed, 12/16/2015 - 18:28

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 Expert

LEEDuser Basic Member

169 thumbs up

Thu, 12/17/2015 - 01:34

Depending on the rainfall data available in your country you might prefer to use the v4 methodology (95% percentile)

Omar Elrawy

Green Building Consultant | Researcher

GreenA Consultants

LEEDuser Basic Member

38 thumbs up

Sun, 12/20/2015 - 12:55

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).

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2 year 24 hour design storm

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