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Next define the functional units using a shape file (refer to Specify functional units (Step 5) for details) and assign areas to them using a raster (Specify functional unit areas (Step 6)). Figure 1- shows an example of this. The next section provides details on configuring rainfall runoff, constituent generation and filter models in Source.
Figure 1. Geographic Wizard- Assigning Functional Unit Areas
Defining and assigning models
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Nodes – select FlowScaledLossModel from the Node models drop down list and click Add Model.
Figure 2. Geographic Wizard - Assigning Inputs to Rainfall Runoff Models
Parameterising models
This section describes how to parameterise each of the assigned models. It requires the parameterisation of both components – PERFECT and GWLag.
Rainfall runoff
Choose PERFECT-GWLag model parameterisation from the Available Methods drop down list. The PERFECT and GWLag parameters are specified under separate tabs
To parameterise PERFECT:
Select the Landuse tab under Perfect Parameters and click Load. Import the land use database in the same way
Once the database is loaded, check and adjust the crop and soil parameter associations. You may also choose to set the initial conditions such as “Proportion of Field Capacity” or “Crop Residue” Select the Soil tab under Perfect Parameters and click Load. Repeat the process for land use by loading a soils database for specifying soil association groups.
Figure 3. Parameterise Rainfall runoff model – PERFECT
GWLag
To parameterise the GW Lag components, click on the Lag GW parameters tab (shown in Figure 4):
• Set all the global parameters; these can either be changed individually or all at once. To set individually click on the appropriate cell and type a new value. To make changes to all values in a column (e.g. one parameter) change one cell to the desired value. Next right-click in a cell either above or below (in the same column) and select Apply to all sub-catchments from the contextual menu;
• Specify the groundwater parameters by importing them from a GFS shape file. Click Load in the Ground Flow System parameters group box and load a GFS shape file;
• Next, match the fields for aquifer thickness, hydraulic conductivity and storativity from the loaded GFS shape file by selecting the appropriate field name from each of the three drop-down lists; and
• Click Apply.