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=Introduction=
Originally published in 1999, and subject to continuous development, the Flood Estimation Handbook (FEH) comprises the standard methods for estimating flood frequency. The rainfall-runoff model is one of two core handbook methods. In 20162015, the Centre of Ecology and Hydrology (CEH) and Wallingford Hydro Solutions (http://www.hydrosolutions.co.uk) released anothera new version of the revitalisedRevitalised Flood Hydrograph rainfall-runoff model (ReFH2) which allows users to generate design flows and hydrographs from given rainfall events for both catchment and development sites. ReFH2 is a rainfall-runoff model specifically applicable to England, Wales and parts ofthe ScotlandUK. It takes inputs from the FloodFEH2013 Estimationweb Handbook 2013service (FEH2013https://fehweb.ceh.ac.uk) website, and generates design rainfall events and provides a method for calculating design runoff from sites or contributing subcatchments.
For a full description of the approaches, the reader is referred to their documentguidance which can be freely accessed at:-
httphttps://fileswww.hydrosolutions.co.uk/refh2support/refh2_faq/refh2_literature/ReFH2_Technical_Report.pdf. The ReFH2 method is available within the ReFH2 software<br>
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To use the ReFH2, the software must be installed locally and a licence must be obtained from Wallingford HydroSolutions. The ReFH2 software can be installed from http://files.hydrosolutions.co.uk/refh2/latest.
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