IDF Curves
IDF Curves
(OP)
The City has a set of IDF curves covering rainfall frequencies from two years through 100 years. However, the LEED SS6.1 template asks for 1- and 2-year runoff amounts.
Is there a way to generate b, d, and e coefficients for a 1-year frequency if 2-, 3-, 5, 10, 25, and 100-year coefficients are known?
Is there a way to generate b, d, and e coefficients for a 1-year frequency if 2-, 3-, 5, 10, 25, and 100-year coefficients are known?





RE: IDF Curves
You'll probably have to use local rainfall data from the NOAA PFDS or another similar source.
http://hdsc.nws.noaa.gov/hdsc/pfds/
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: IDF Curves
RE: IDF Curves
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: IDF Curves
In I = a / [(tc + b) ^c ] it's the "a" that can be modified to directly change the maximum intensity and thus total rainfall depth. So what we do is just decrease this parameter until we get a total rainfall depth of 25mm.
HTH