QGIS ReFH2 to TUFLOW: Difference between revisions
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Once the location, event selection and, if selected, the input GIS are specified, the user then selects the outputs that they are wanting to use within their TUFLOW model. These can be rainfall hyetographs or inflow hydrographs.
Rainfall outputs can be applied as 2d_rf or 2d_sa_rf TUFLOW boundaries. The user selects whether they want to use the Gross Design Rainfall, or the Net Design Rainfall where the ReFH2 losses have been applied. The former would usually be applied to TUFLOW with some allowance for losses within TUFLOW, most commonly via 2D Infiltration. The latter will have ReFH2 losses already accounted for so additional losses would not usually be required.
As well as the option to specify Gross or Net rainfall, the user can also select the rainfall type. The options are rural and urban. The rural rainfall is the default option which would represent the situation were the subcatchment 100% rural whereas the urban rainfall allows the representation of the URBEXT2000 parameter or Urban Area if specified in the 'Location' section. Further control over the impact of urbanisation can be carried out within the ReFH2 software. Note, that this option will only affect the Net Design Rainfall, it will have no impact on the Gross Design Rainfall. The output in both cases is the Total net rain mm (ARI) which for the rural model is 100% rural and with the urban model is the sum of the Urban net rain mm (ARI) and the Rural net rain mm (ARI). When using point descriptors, it is important to specify an appropriate Urban Extent in the 'Location' section to derive the correct losses for the study area.
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[[File:ReFH2 Output.png|800px]]<br>
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