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Figure 3. Geographic Wizard, Network definition by drawing
The other options in the list (Pan, Zoom, Copy graph and Properties) have the same function as that described for using the DEM based network generation method.
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Figure 4. Geographic Wizard, Incomplete connection of sub-catchments
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Figure 7. Geographic Wizard, Adding FUs via a text file
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This step only appears if a catchment model plugin has been installed. It allows you to assign models to entire catchment or individual sub-catchments and it generally applies to catchments that model, for example, groundwater (for the GWLag Plugin). It is synonymous to choosing the menu item Edit » Catchments » Assign Models.
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This technique can be replicated for other Apply-to options available in the wizard. It can be used to:
- Assign a single value to all FUs across all sub-catchments;
- Assign a single value to all FUs in a particular sub-catchment (eg. 50% of the total area is assigned to each FUs in sub-catchment #9);
- Assign a single value to all FUs of a certain type (across all sub-catchments); or
- Re-allocate FU areas by value or percentage. For example, if you have already specified that 50% of each sub-catchment is of FU type "Forest", and 50% is of type "Urban", you could model increases in urban encroachment by specifying Auto-increase by 5%, all FUs of type "Urban" at the expense of all FUs of type "Forest". See Figure 12.
Ensure that the percentage values for each sub-catchment sum to 100% prior to re-allocating FU areas.