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Line 11: <li>Close the two layers in the Layers Panel and then reload them from the project GeoPackage file '''M02_5m_002.gpkg'''. <li> The <b>2d_mat_FMT_M02_DEV_001_R</b> layer contains polygons defining grassed areas and roads within the proposed development.i> The materials attribute for a number of polygons representing proposed roads in the <b>2d_mat_FMT_M02_DEV_001_R</b> layer have not been assigned and will need to be populated. Turn on Toggle Editing mode and assign a Material ID of 2 to these polygons as shown in the figure below. Leave the remaining larger polygon with a Material ID of 1.<br> <li>The <b>2d_mat_FMT_M02_DEV_Buildings_001_R</b> layer contains polygons defining the buildings within the proposed development.All polygons within the <b>2d_mat_FMT_M02_DEV_Buildings_001_R</b> layer represent the buildings of the proposed development and will have the same Material ID of 3. Make use of the ‘Update All’ feature to automatically assign this value to all objects at the same time. Toggle Editing for the '''2d_mat_FMT_M02_DEV_Buildings_001_R''' layer then right-click and select ''Open Attribute Table''. Type '3' in the blank field and select ''Update All'' as shown in the figure below. <br> <li>Open the Materials.csv file within the <b>TUFLOW\model\</b> folder to observe the Manning’s n values that will be assigned to each Material ID.</ol>

FM Tutorial M02 QGIS GPKG Define Roughness: Difference between revisions