UKFE (version 2.0.0)

QMEDDonEq: 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

Author

Anthony Hammond

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.

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
)