| DDF {UKFE} | R Documentation |
DDF results from a DDFImport object
Description
Extracts results from a data frame imported using the DDFImport function
Usage
DDF(x, duration, RP = 100)
Arguments
x |
A data frame of DDF13 or DDF22 results imported using the DDFImport function |
duration |
the duration (hrs) for which a rainfall depth estimate is required |
RP |
the return period (years) for which a rainfall depth estimate is required |
Details
The .xml files only provide a set number of durations and return periods for DDF13 and DDF22. This function optimises the GEV distribution on the results in order to interpolate across return periods. A linear interpolation is used between durations. The interpolation method may provide results that differ from the FEH webserver in the region of 0.1mm. The result is then rounded to an integer.
Value
A DDF13 or DDF22 estimate of rainfall depth (mm)
Author(s)
Anthony Hammond
Examples
#Get DDF13 results from a the DDF
## Not run: DDF13.4003 <- DDFImport("C:/Data/NRFAPeakFlow_v9/Suitable for QMED/04003.xml")
#Estimate the 20-year, 5 hour depth
## Not run: DDF(DDF13.4003, duration = 5, RP = 20)