QMEDDonEq: QMED donor adjustment

In UKFE: UK Flood Estimation

QMED donor adjustment

Description

Applies a donor adjustment to the median annual maximum flow (QMED) estimate

Usage

QMEDDonEq(
  QMED.scd,
  QMEDgObs,
  QMEDgCds,
  Distance = NULL,
  xSI,
  ySI,
  xDon,
  yDon,
  alpha = TRUE
)

Arguments

QMED.scd	Ungauged QMED estimate for the site of interest
QMEDgObs	the observed QMED at the donor site
QMEDgCds	the QMED equation derived QMED at the donor site
Distance	The distance in km between the catchment centroids of the site of interest and donor site.
xSI	For when distance is not known - the catchment centroid easting for the site of interest.
ySI	For when distance is not known - the catchment centroid northing for the site of interest
xDon	For when distance is not known - the catchment centroid easting for the donor site
yDon	For when distance is not known - the catchment centroid northing for the donor site
alpha	a logical argument with a default of TRUE. When FALSE the exponent in the donor equation is set to one. Otherwise it is determined by the distance between the donor and the subject site

Details

Although a single donor adjustment can be applied with the QMED function, this additional function is provided for flexibility. The method is that of FEH2025.

Author(s)

Anthony Hammond

Examples

# Get observed QMED for site 15006
q_ob <- GetQMED(15006)

# Get QMED equation estimated QMED for the donor site
q_cd <- QMED(CDs = GetCDs(15006))



# Apply the QMEDDonEq function with the information gained, assuming
# a distance of 30km and subject site QMED estimate of 3.9
QMEDDonEq(
  QMED.scd = 3.9, QMEDgObs = q_ob, QMEDgCds = q_cd,
  Distance = 30
)

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