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You can import FU names from a text file by choosing Import from a text file from the Available Methods drop-down menu. The format of the text file is shown in Figure 1376.

You can also import FU names from a shape file:

• Choose Specify from a Shapefile from the Available Methods drop-down menu.
• Click Load to upload a shape file that has been configured with a field for FU types.
• Select the layer from the list and click Create. A list of FU names is generated in the right hand pane. The shape file used to define FU types will also be used to assign the areas to each FU in each sub-catchment.

Specify functional unit areas (Step 6)

You must assign areas to every functional unit in each sub-catchment. The functional units that appear depend on those you defined previously. You can assign areas manually (using either the Table or Map tabs), or from a raster such as a land use map. Alternatively, choose Edit > Functional Units > Assign Area» Functional Units » Assign Area... on completion of the wizard.

To assign FU areas manually using the Table tab:

• Choose Manual Area Allocation from the Available Methods drop-down menu;
• For each sub-catchment, enter the area that is allocated to each FU. You can specify this as an absolute value in the Area (ha) column, or as a percentage in the Area  Area (%) column; and
• You may enter the areas individually, or use the Apply-to options to fill multiple cells at once. This is explained in detail in the Using the Apply-to options section. You can also copy values from one cell and paste into other cells. Right-click on the source cell (the one you want to copy) and choose Copy. Then, right-click on the target cell, and choose Paste. The resulting table is shown in Figure 1387.

When assigning FU areas manually using the Map tab, you can view the entire catchment and its outlines. FU areas can be assigned as follows:

• Click on a sub-catchment that you want to assign a model to, or highlight several using the mouse (drag and select). Alternatively, use Ctrl to select several sub-catchments. If you hover the mouse over a selected sub-catchment you will see the its number or name;
• To assign the area covered by each FU to the selected sub-catchments, select a cell in the table you want to assign the area to; and
• Use the Apply-to options to assign the same area to the selected sub-catchment/FU combinations.

If the areal percentages per sub-catchment, do not sum to 100%, the percentage cell turns pale red (to indicate an error) for that sub-catchment. In Figure 1398, SC # 1 (Urban FU), the area percentage should be 50, not 5. The error applies only to SC#1, so the cell for SC#2 is not pale red.

Figure 140 shows 8 shows the correct areal percentages for SC#1.

You can assign areas to multiple FUs simultaneously, using the Apply-to options on the right of the screen. This is useful when you have a large number of sub-catchments, each containing several FUs.

• In the Area  Area (ha) or Area  Area (%) column, click in any cell;
• Enter a value or percentage;
• Specify the appropriate values in the Apply selected cell to: options (to the right of the table); and
• Click Apply, and the value will propagate through the specified sub-catchments and/or FUs.

To assign FU areas using a raster:

• Click Load to upload a raster file;
• If the land use map does not include a mapping of grid code to land use, click Assign Mapping Assign Mapping;
• In the resulting window, assign a FU to each grid code using the drop-down menu in the FU column (Figure 1419); and
• Click OK to close the Match FU Definitions to Raster window.

For each sub-catchment, the FU areas MUST add to 100% (+/- 0.1%). If areas do not sum to 100%, cells in the Area column will be shaded pale red. An exclamation mark will also appear on the left side of the first column.

Rainfall runoff models (Steps 7-9)

The next 3 steps involve configuring the rainfall runoff models for every FU/sub-catchment combination. Refer to Assign rainfall runoff models for details on completing these steps. Click Next or Back to navigate between them.

On completion of step 7, the Finish tab at the bottom of the wizard becomes active, indicating that the information provided up to this point is the minimum data required to complete the wizard. Click Finish if you wish to complete the scenario.

Constituent models (Steps 10-11)

Here you configure the constituent generation models for each FU/sub-catchment//constituent combination. provides details on how to do this.

Filter models (Steps 12-13)

You now assign a filter model for each FU/sub-catchment//constituent combination. Filtering models represent for example, the effects of riparian filter strips, artificial wetlands, farm dams and similar management treatments. Fluxes from each FU can be passed through separate "filters". Refer to Configuring filter models for more details.

Assign link models (Step 14)

Just as FUs are assigned models in sub-catchments, you must also assign models to links (Figure 14210). In this step, you assign each link a routing model. You can also assign an in-stream processing model for every defined constituent.

To assign a routing model to a link, click on the link and choose a routing model from the routing model drop-down menu. You can use the Apply-to options to apply the same link model to other links in the network. Figure 142 shows 10 shows the available routing and in-stream processing models. To assign in-stream processing models to the links, click on the desired link, and choose the appropriate model from the drop-down menu in the Model column. Click Edit... to configure parameters for each of storage routing only. Lag routing will need to be parameterised at the next step.

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To check which model has been assigned to a link, click on the link. The link model will be displayed in the Routing model pull-down list. Click Next when the desired models have been assigned to all links.

Parameterise link models (Step 15)

To assign parameter sets to link models, select the link that was assigned a model in the previous step. Then, using the Parameters drop down list, follow the same process used for rainfall runoff and constituent generation models to generate parameter sets (Figure 143).

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