Using ReFH2 to Generate TUFLOW Boundary Inputs: Difference between revisions
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Once the parameters have been imported, and the country specified, apply the parameters and choose to move to the next page. On the next page you can choose which rainfall model to use, FEH1999 or FEH2013. It’s possible to specify the design rainfall return periods of interest and ReFH2 will automatically calculate the recommended duration and suggest an appropriate timestep that meets the requirement that the duration must be an odd multiple of the time step. The recommended duration should normally be used, although both values can be edited directly to provide the duration that is required. The XML file from the FEH2013 website contains the rainfall depths for a number of pre-defined return period/duration combinations. For those return period/duration combinations that are not pre-defined, ReFH2 undertakes a two-way interpolation process. ReFH2 will then generate the design rainfall hyetograph based on the rainfall depth and the FSR approach.
On the right hand side you can see the calculated Areal Reduction Factor and Seasonal Correction Factors which will be applied. The rainfall profile can vary depending on the season selected (summer or winter) and the seasonal correction factor and areal reduction factor are both applied to the rainfall hyetograph to obtain the correct design rainfall hyetograph.
Once the Return periods and durations have been defined then click next. This brings up the various parameters together with the rainfall hyetographs and runoff hydrographs for the various return periods. The rainfall hyetographs and runoff are available as rural and urbanised scenarios.
<ol>
Data can be viewed either as graphs or as grids. The available data includes the following for the selected return period and duration:-
<li> Design Rainfall
<li> Urban net rainfall
<li> Rural net rainfall
<li> Sewer Loss
<li> Total net rain
<li> Direct Runoff
<li> Baseflow
<li> Total Flow
</ol>
<br>
The return period can be varied using the dropdown menu in the Rainfall section.
The catchment descriptors (BFIHOST, DPLBAR, DPSBAR, SAAR, PROPWET and Area) can all be edited should a sensitivity analysis be required.
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