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NC-2009 SSc6.1:Stormwater Design—Quantity Control

IDF curves

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MKK LEED
MKK Consulting Engineers
LEEDuser Basic Member
1 thumbs up

Hi, I have a NC project in Colombia and the Environmental Authority just have IDF curves since 3 years. I don't have information since 1 and 2 years. Can I use the value for 3 years in order to calculate the runoff or should I use an alternative methodology to calculate IDF curves for 1-2 years? Thanks

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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Thu, 10/23/2014 - 16:55

You want to be using depth, not intensity. IDF curves are typically used for rational method, which does not yield an accurate volume. What methodology are you using? Use NOAA for site specific 24-hour rainfall depths. But to answer your original question, no, you can not back into a 1 and 2 year depth from a 3-year intensity. The relationships are not linear.

Wed, 07/22/2015 - 17:04

Hi MKK, How did you manage to document this credit? We have a project in Colombia and we do not know how to find the rainfall data to make the calculations (either v3 or v4 methodology).
Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Wed, 07/22/2015 - 18:13

For international projects, seek out an agency that is the equivalent of NOAA in the United States. I recommend contacting a local engineering university with a program in hydraulics and hydrology for direction.

Wed, 07/22/2015 - 18:55

Thanks Michael! I've found this document which will be useful for other project teams: http://www.bdigital.unal.edu.co/2467/4/98671272.2009_4.pdf

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