Using ReFH2 to Generate TUFLOW Boundary Inputs: Difference between revisions

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=Introduction=

In 2016, the Centre of Ecology and Hydrology (CEH) and Wallingford Hydro Solutions (http://www.hydrosolutions.co.uk) released another version of the revitalised 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 the 2nd version of the “Revitalised Flood Handbook”, created and developed by Wallingford Hydro Solutions. It’s a rainfall-runoff model specifically applicable to England, Wales and parts of Scotland. It takes inputs from the Flood Estimation Handbook 2013 (FEH2013) website and generates design rainfall events and provides a method for calculating design runoff from subcatchments.

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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=FEH 2013 Rainfall=

FEH2013 is a new method for generating design rainfall hyetographs, superseding the FEH1999 method. In order to generate the design rainfall, the user obtains design rainfall depths from the FEH2013 web service at https://fehweb.ceh.ac.uk for pre-defined return periods/duration combinations. This requires a log on and user credits to purchase the data for the desired location. Data is available at a river catchment scale and as a point value. Both of these provide XML containing the rainfall depths. This is then imported into the ReFH2 software to generate hyetographs based on Flood Studies Reports (FSR) approaches (which have been published).

[[File:Point_Descriptors.png]]<br>

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Once an area value has been provided then it is possible to generate the rainfall hyetographs and runoff hydrographs and apply to TUFLOW in the same manner as for catchment descriptors.