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• Choose Draw Network from the Available Methods drop-down menu;
• Click Load Sub-catchment Map and open the desired sub-catchment raster file;
• Click and drag on the map to create a stream network by specifying the direction of flow between sub-catchments. Ensure a connection is also made from the lower-most sub-catchment to a point outside the sub-catchment.This is the catchment outlet, highlighted with a circle in Figure 4.
• Click Next once the network includes every sub-catchment and a corresponding outlet. You can rename the sub-catchments in the table under the Sub-catchment button.

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Enter a list of constituents that are of interest and which you wish to model. If you do not enter any constituents, the wizard does not display any steps that are constituent-related, ie. the constituent generation, filter assignment and filter parameterisation steps appear greyed out. Examples of constituents are total nitrogen (often abbreviated as TN), total suspended sediment (TSS), heat, dissolved oxygen, radioisotope tracers, etc.

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You can also add constituents after a scenario is set up using Edit » Constituents, which opens the Configure Constiuents dialog (Figure). Refer to Defining constituents for more detail. To add a constituent, type its abbreviation in the Name field and either click Add or press the carriage return. To remove a constituent, highlight it and click Delete.

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You must specify all possible functional units present in the area of interest, or that you want to represent in the scenario. There are three ways of defining FUs: manually, from a text file, or from a shape file (Figure 1366).

Figure 6. Manually adding functional units

The default method of defining FUs is manually. To add a FU, type it in the Name field, and either click Add or press carriage return. To remove a FU, highlight it and click Delete.

You can import FU names from a text file by choosing Import from a text file from the Available Methods Available Methods drop-down menu. The format of the text file is shown in Figure 67.

You can also import FU names from a shape file:

• Choose Specify from a Shapefile from the Available Methods 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.

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• 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 (%) 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 78.

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:

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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 8, 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 8 shows the correct areal percentages for SC#1.

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