QMED_FEH08: QMED (median annual maximum flow) estimate from catchment...

In UKFE: UK Flood Estimation

QMED (median annual maximum flow) estimate from catchment descriptors using the FEH 2008 method.

Description

Estimated median annual maximum flow from catchment descriptors.

Usage

QMED_FEH08(CDs = NULL, UrbAdj = TRUE, AREA, SAAR, FARL, BFIHOST, URBEXT)

Arguments

CDs	catchment descriptors derived from either GetCDs or CDsXML
UrbAdj	logical argument with a default of TRUE. If TRUE, an urban adjustment is made to the estimate.
AREA	catchment area in km2
SAAR	standard average annual rainfall (mm)
FARL	flood attenuation from reservoirs and lakes
BFIHOST	baseflow index calculated from the catchment hydrology of soil type classification
URBEXT	measure of catchment urbanisation

Details

QMED is estimated from catchment descriptors: QMED = 8.3062 * AREA^0.851 * 0.1536^(1000 / SAAR) * FARL^3.4451 * 0.046^(BFIHOST^2) as specified by FEH2008. If the CDs argument is used then the SAAR used is SAAR6190, FARL is FARL (as opposed to FARL2015) and BFIHOST is BFIHOST (as opposed to BFIHOST19 or BFIHOST19scaled). Note that this function is a legacy function and you cannot do donor adjustment within the function. You can however use this in conjunction with the QMEDDonEq function.

Value

An estimate of QMED from catchment descriptors.

Author(s)

Anthony Hammond

Examples

# Get some catchment descriptors and calculate QMED as if it was ungauged

cds_55004 <- GetCDs(55004)
QMED_FEH08(cds_55004)

UKFE documentation built on June 19, 2026, 5:08 p.m.