UK Flood Estimation
Add an AMAX sample
Aggregate a time series
Import an annual maximum (AMAX) sample from NRFA peak flow .AM files
Plot of the annual maximum sample
Annual statistics extraction
Areal reduction factor (ARF)
Baseflow index (BFI)
Bootstrap
Import catchment descriptors from .xml files
Convert between British National Grid Reference (BNG) and Latitude and...
DDF results from a DDFImport object
FEH99 depth duration frequency precipitation model
DDF99 parameters from .xml files
Derive and plot rainfall Depth Duration Frequency curves.
DDF13 or DDF22 results from .xml files
Design hydrograph extraction
Linearly detrend a sample
Diagnostic plots for pooling groups
Donor adjustment candidates & results
Encounter probabilities
Extreme rank plot
Extreme value plot (frequency and growth curves)
Add lines and/or points to an extreme value plot
Extreme value plot for pooling groups
Flow duration curve
Flow splitter
Generalised logistic distribution - estimates directly from sample
Generalised logistic distribution estimates from parameters
Generalised logistic distribution growth factors
Generalised logistic distribution parameter estimates
Generalised Pareto distribution estimates from parameters
Generalised Pareto distribution growth factors
Generalised Pareto distribution parameter estimates
Generalised Pareto distribution - estimates directly from sample
Get an annual maximum sample from the National River Flow Archive site...
Get catchment descriptors from the National River Flow Archive sites c...
Get flow or level data from the Environment Agency's Hydrology Data Ex...
Get Environment Agency rainfall data (England).
Get regional Met Office average temperature or rainfall series (monthl...
Get National River Flow Archive data using gauge ID.
Get flow or level data from the Scottish Environmental Protection Agen...
Get Scottish Environment Protection Agency (SEPA) hourly rainfall data...
QMED from a gauged site suitable for QMED
Generalised extreme value distribution - estimates directly from sampl...
Generalised extreme value distribution estimates from parameters
Generalised extreme value distribution growth factors
Generalised extreme value distribution parameter estimates
Goodness of fit comparison (single sample)
Goodness of fit comparison (for a pooling group)
Gumbel distribution - estimates directly from sample
Gumbel distribution estimates from parameters
Gumbel distribution growth factors
Gumbel distribution parameter estimates
Heterogeneity measure (H2) for pooling groups.
Hydrological plot of concurrent discharge and precipitation
Kappa3 distribution - estimates directly from sample
Kappa3 distribution estimates from parameters
Kappa3 distribution growth factors
Kappa3 distribution parameter estimates
Linear coefficient of variation (Lcv)
Urban adjustment for the linear coefficient of variation (Lcv)
Linear Kurtosis (LKurt)
Lmoments & Lmoment ratios
Adjust L-Ratios in a pooling group
Linear Skewness (LSkew)
Urban adjustment for the linear skewness (LSkew)
Monthly Statistics
British national grid reference (NGR) distances
Non-flood adjustment
Non-flood adjustment for pooling groups
Optimise distribution parameters
Create pooling group
Pooled flood estimates
Create pooling group for small catchments
Peaks over threshold (POT) data extraction
Peaks over threshold (POT) data extraction (quick)
QMED (median annual maximum flow) estimate from catchment descriptors
QMED donor adjustment
QMED factorial standard error for gauged sites
QMED Linking equation
Empirical estimate of QMED from peaks over threshold (POT) data
Quick pooled results
Stage-Discharge equation optimisation
Revitalised Flood Hydrograph Model (ReFH)
Seasonal correction factor (SCF)
Data simulator
Trend hypothesis test
Urban adjustment factor (UAF) and percentage runoff urban adjustment f...
Urban expansion factor
Uncertainty quantification for gauged and ungauged pooled estimates
Site gauged linear coefficient of variation (Lcv) weightings
Site gauged linear skewness (LSkew) weightings
Site ungauged linear coefficient of variation (Lcv) weightings
Site ungauged linear skewness (LSkew) weightings
Gauged pool weighted linear coefficient of variation (Lcv)
Gauged pool weighted linear skewness (LSkew)
Ungauged pool weighted linear coefficient of variation (Lcv)
Ungauged pool weighted linear skewness (LSkew)
Zdist Goodness of fit measure for pooling groups
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 13. 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). "Proposal of the extreme rank plot for extreme value analysis: with an emphasis on flood frequency studies", Hammond (2019, <doi:10.2166/nh.2019.157>). "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>). "Improving the FEH statistical procedures for flood frequency estimation", Environment Agency (2008, ISBN: 978 1 84432 920 5). "Low flow estimation in the United Kingdom", Institute of Hydrology (1992, ISBN 0 948540 45 1). Wallingford HydroSolutions, (2016, <http://software.hydrosolutions.co.uk/winfap4/Urban-Adjustment-Procedure-Technical-Note.pdf>). 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>).