The Geographic Wizard is the first in a series of steps required to create a catchments scenario. It consists of a structured sequence of windows that guides you through the process of defining the catchment area. On completion of the wizard, you will be presented with a node-link network. This figure outlines the sequence of steps in the wizard, with a more detailed explanation provided below.
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| Note: After a scenario has been created using the wizard, you cannot change the network, ie. you cannot merge or remove sub-catchcments. |
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. Once you have completed all steps, click Finish to close the wizard and view the catchment in the Geographic Editor. This figure also shows the action buttons that are visible at the bottom of every screen in the wizard.
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Note: In a catchments scenario, the default node type in Source is a confluence node, where the inputs to the node are the upstream sub-catchment outlets, and the output from the node is the current sub-catchment outlet. Similarly, straight through routing is the default link type in Source. On completion of the wizard, if you wish to change the node model or link type, right click on the confluence node in the Geographic Editor, then choose Change Node Model or the link type respectively, from the contextual menu. For nodes, this lists all the model types available. Choose the required model. |
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Figure 1. Network definition via a DEM
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Adding nodes
Ordinarily, nodes are placed at stream confluences identified in a DEM analysis. It is possible to supplement these nodes and place additional nodes at different locations, typically to identify some point of interest, such as a gauging station of a dam wall. This will also cause additional sub-catchments to be created.
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