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In some situations, the wizard will skip over several steps if certain values have not been specified. For example, if you do not define any constituents (step 4), you cannot assign inputs or parameterise any constituent-related steps. Therefore, steps 8-13 will appear greyed out in the wizard progress indicator (Figure 2). This figure also shows the action buttons that are visible at the bottom of every screen in the wizard.
Figure 2. Network definition via a Digital Elevation Model
On completion of a step, you can move to the next step by clicking Next and backwards by selecting Back. Note that you cannot go back to the network definition step once you have completed it and moved to the next step. Cancel allows you to quit the wizard at any time. Note that you will lose all the data entered so far. You can also complete the scenario if the Finish button is active (from step 7 onwards). Source will create a scenario when all mandatory steps have been completed, even if all the steps in the wizard have not been completed.
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- Choose DEM based network generation from the Available Methods drop-down menu;
- Click Load DEM;
- Navigate to the catchment DEM and open it. Source generates a default network based on a minimum sub-catchment area of 50 km2. It is recommended that you specify the minimum sub-catchment area prior to loading a high resolution DEM to reduce computational time;
- Specify a different minimum sub-catchment area in km2, if necessary, and click Recompute Streams. The drainage density depends on the minimum sub-catchment area; and
- Select a desired catchment outlet (a point in the network where all streams in the desired area converge) for investigation by clicking inside the map. This generates a network area broken into sub-catchments (shaded blue), where two sub-catchments converge at a confluence.
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- To add a new catchment outlet, choose Select Cell from the contextual menu, and select another point on the catchment map; or
- Pan allows you to move the map up, down, left or right; or
- To zoom in, right-click, and choose Zoom In. Drag the mouse to form a zoom box (top right to lower left). To zoom out, double-click anywhere on the map or click Undo Zoom; or
- To remove a catchment outlet point, choose Remove Cell; or
- Choose Properties to change the attributes of various elements, such as the colour or symbol of nodes; or
- Save allows you to save the map as a .asc file.
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