View source for FM Tute M01 MI 1D2D Banks

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=Introduction=
In this section we will define the bank elevations of the watercourse. These are the elevations of the 1D/2D boundary cells that link the 1D Flood Modeller watercourse to the 2D TUFLOW floodplain. Note that it is these cell elevations that determine whether out of bank flooding occurs and not the left/right bank elevations with the Flood Modeller 1D cross-sections. 

=Method=
<li>Import in an empty <b>2d_bc_empty.mif</b> layer from within the '''FMT_tutorial\FMT_M01\TUFLOW\model\mi\empty''' folder.</li>
<li>Save the layer as <b>2d_bc_FMT_M01_HX_001.TAB</b> in the '''FMT_tutorial\FMT_M01\TUFLOW\model\mi''' folder. </li>
<li>Open the <b>1D_2D_Points.TAB</b> GIS layer from the '''Module_Data\Module_01\mi''' folder. Select all objects from within this layer, copy and paste into <b>2d_bc_FMT_M01_HX_001.TAB</b>. </li>
<li>Interrogate one of the digitised points and inspect the attributes. The ‘type’ attribute is ‘ZP’ to denote that it is a z-point. The ‘f’ attribute is the elevation of the bank link in mAOD. </li>
<li>Now add the layer <b>2d_bc_FMT_M01_HX_001.TAB</b> from the '''FMT_tutorial\FMT_M01\TUFLOW\model\mi''' folder created in the previous step. Note that all the 'ZP' points created in the layer <b>2d_bc_FMT_M01_HX_001.TAB</b> are snapped to vertices of the layer <b>2d_bc_FMT_M01_HX_001.TAB</b>. This is because these two layers work together to define the bank locations and crest elevations. The layer line in <b>2d_bc_FMT_M01_HX_001.TAB</b> defines the location and the layer points in <b>2d_bc_FMT_M01_HX_001.TAB</b> defines the elevations. 
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[[File:FMT 1D-2D ZP.jpg]]

<li>Export to .MIF format in preparation for reading into TUFLOW.</li>

 <div style="background-color: #D6E9E0; margin: 20px; text-align: center;
border: 5px solid #1ABDC9">
  <p style="font-weight: bold; color: #E20177">Key Tip!</p>
  <p> The bank (1D/2D boundary) elevations may also be defined using a 2d_zsh layer or other 3D breakline layer. The advantage of using a 2d_bc layer is it ensures the boundary cell elevations are raised and not that of adjacent cells.   </p>
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Please return to the [[Flood_Modeller_Tutorial_Module01#Deactivate_2D_cells|Flood Modeller Tutorial Model]].

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