DonAdj

Provides donor adjustment candidates, with associated descriptors, in order of the proximity to the centroid of the subject catchment.

Functions to implement the methods of the Flood Estimation Handbook (FEH), associated updates and the revitalised flood hydrograph model (ReFH). Currently the package uses NRFA peak flow dataset version 14. Aside from FEH functionality, further hydrological functions are available. Most of the methods implemented in this package are described in one or more of the following: "Flood Estimation Handbook", Centre for Ecology & Hydrology (1999, ISBN:0 948540 94 X). "Flood Estimation Handbook Supplementary Report No. 1", Kjeldsen (2007, ISBN:0 903741 15 7). "Regional Frequency Analysis - an approach based on L-moments", Hosking & Wallis (1997, ISBN: 978 0 521 01940 8). "Making better use of local data in flood frequency estimation", Environment Agency (2017, ISBN: 978 1 84911 387 8). "Sampling uncertainty of UK design flood estimation" , Hammond (2021, <doi:10.2166/nh.2021.059>). "The FEH 2025 statistical method update", UK Centre for Ecology and Hydrology (2025). "Low flow estimation in the United Kingdom", Institute of Hydrology (1992, ISBN 0 948540 45 1). Data from the UK National River Flow Archive (<https://nrfa.ceh.ac.uk/>, terms and conditions: <https://nrfa.ceh.ac.uk/help/costs-terms-and-conditions>).

Anthony Hammond

UKFE

UK Flood Estimation

DonAdj function

<dl><dt>CDs</dt>
<dd>catchment descriptors derived from either GetCDs or CDsXML for the site of interest</dd>
<dt>N</dt>
<dd>number of sites provided; default is 10</dd>
<dt>UrbMax</dt>
<dd>a maximum value for URBEXT (the default is 0.03). Any sites with UBEXT2015 above UrbMax will not be included in the results.</dd></dl>

Arguments

Author

Donor adjustment candidates — DonAdj

<dl>

<dt>CDs</dt>
<dd>catchment descriptors derived from either GetCDs or CDsXML for the site of interest</dd>


<dt>N</dt>
<dd>number of sites provided; default is 10</dd>


<dt>UrbMax</dt>
<dd>a maximum value for URBEXT (the default is 0.03). Any sites with UBEXT2015 above UrbMax will not be included in the results.</dd>

</dl>

DonAdj: Donor adjustment candidates

Description

Usage

Value

Arguments

Author

Details

Examples