DDF: DDF results from a DDFImport object

In UKFE: UK Flood Estimation

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)

UKFE documentation built on Sept. 30, 2024, 9:46 a.m.