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 is an interpolator function to derive depths for intervening durations and return periods. The result is rounded to an integer.

Value

A DDF13 or DDF22 estimate of rainfall depth (mm)

Author(s)

Anthony Hammond

Examples

# Import DDF13 results from an NRFA Peak Flows XML file
## Not run: 
ddf13_4003 <- DDFImport("C:/Data/NRFAPeakFlow_v9/Suitable for QMED/04003.xml", DDFVersion = 13)

## End(Not run)

# Estimate the 20-year, 5-hour depth
## Not run: 
DDF(ddf13_4003, duration = 5, RP = 20)

## End(Not run)

UKFE documentation built on Nov. 5, 2025, 6:25 p.m.