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(
  AREA,
  SAAR,
  FARL,
  BFIHOST,
  QMEDgObs,
  QMEDgCds,
  xSI,
  ySI,
  xDon,
  yDon,
  alpha = TRUE
)

Arguments

AREA	catchment area in km2
SAAR	standardised average annual rainfall in mm
FARL	flood attenuation from reservoirs and lakes
BFIHOST	the baseflow index as a function of soil type
QMEDgObs	the observed QMED at the donor site
QMEDgCds	the QMED equation derived QMED at the donor site
xSI	the catchment centroid easting for the site of interest
ySI	the catchment centroid northing for the site of interest
xDon	the catchment centroid easting for the donor site
yDon	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 DonAdj() function and the QMED(), this is provided for flexibility. The method is that of Science Report: SC050050 - Improving the FEH statistical procedures for flood frequency estimation (2008).

Author(s)

Anthony Hammond

Examples

#Get observed QMED for site 15006
Qob <- median(GetAM(15006)[,2])
#Get QMED equation estimated QMED for the donor site
QCD <- QMED(CDs = GetCDs(15006))
#display CDs for site 27051 & note the easting and northing
GetCDs(27051)
#display CDs for site 15006 & note the easting and northing
GetCDs(15006)
#Apply the QMEDDonEq function with the information gained
QMEDDonEq(194, 1096, 0.955, 0.297, Qob, QCD, xSI = 289289,ySI = 947523,xDon = 280908,yDon = 953653)

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