Rainfall Intensity
Rainfall Intensity
(OP)
Where can I find values for rain intensity for Northern Illinois? Are the values published for design (10 year storm)?
Thanks
Thanks
EIT
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RE: Rainfall Intensity
RE: Rainfall Intensity
http://hdsc.nws.noaa.gov/hdsc/pfds/
RE: Rainfall Intensity
Now to really show my lack of knowledge...
I'm not designing anything as this is not my area of expertise, but trying to understand how stormwater volume is handled for roof/parking lot runoff.
Using the Rational Method (Q=CIA)
When using the intensity values listed in the documents above what duration should be used for a 10-year storm?
Also to clarify, are the intensity values listed in the previous posts typically used in design or do you typically find tc (time of concentration) then solve for Intensity?
Thanks again.
EIT
RE: Rainfall Intensity
As to roof drainage, that is a plumbing issue. Refer to the link:
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RE: Rainfall Intensity
Then if you go further down your storm network, recalculate the Tc, recalculate the I, and take the total watershed to that point as your A, instead of summing up the constituent Cs from upstream sub-watersheds.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Rainfall Intensity
So then the "storm duration" = Tc for the IDF chart?
Thanks
EIT
RE: Rainfall Intensity
So yeah. "storm duration" = Tc for the RATIONAL METHOD ONLY. Don't go mixing methods and start designing pipes for intensities assuming a 24 hour Tc.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com