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Modelling farm dams in Source using the Onstream Farm Dam node
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Create node(s) for farm dams in a Source model
The creation of a farm dam node (i1) in a river system model from the Schematic Editor and (ii2) in a catchment model from the Geographic Editor, is different. The methods for both models are described separately below:
(1) From the Schematic Editor
The green triangle icon 
on the Node Palette represents the onstream farm dam. Dragging the icon from the Node Palette to the Schematic Editor interface can create a farm dam node. The accurate coordinates of farm dams’ positions are not required.
(2) From the Geographic Editor
There are two ways to add the onstream farm to the catchment model from the Geographic Editor:
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a. Change an single existing model element in a Source catchment model to an onstream farm dam
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The first step is to select an existing model element (e.g., a Confluence node) and right-click on it, and the context menu then will be displayed. Clicking on the menu item of Change Node Model (1 in Figure 2) on the context menu will display the additional context menu, and further clicking on the Onstream Farm Dam option (2 in Figure 2) will change the node to Onstream Farm Dam that is displayed as a green triangle icon. The user can use the menu item of Add Node (3 in Figure 2) to add a Confluence node for node model change if needed. The accurate coordinates of farm dams’ positions may not be essential.
Figure 2 Modeling Onstream Farm Dam node from Geographic Editor
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b. Bulk Change Node Models for onstream farm dams:
Right-clicking on any place in the model interface of Geographic Editor will display a context menu, which includes the menu item Bulk Change Node Model (4 in Figure 2). This menu item allows the user to change a group of nodes to onstream farm dams at once. The procedure is as follows:
- Prepare a location shapefile of the nodes for the fam dams - These locations should be already used during the model building and exist as nodes in the catchment model.
- Open Bulk Change Node Models editor - Clicking on the menu item Bulk Change Node Model will show the interface of the Bulk Change Node Models editor (Figure 3). Initially, the contents in the Nodes Located box and the selected item in the dropdown list of destination node types are empty.
- Configure Bulk Change Node Models editor - Clicking on the button of Load node location shape file (Figure 3) will display the Open dialogue box, which allows the user to select the prepared location shape file. After the user clicks on the OK button on the Open dialogue box, the node names (e.g. 156, 157) in the Source model will be displayed in the Nodes Located box, and those nodes have the exact locations defined in the shapefile. The user must select Onstream Farm Dams from the dropdown list below the Nodes Located box.
- Convert the selected nodes to destination node type – Clicking on the button of Change all loaded nodes in Figure 3 will convert all nodes in the Nodes Located box to the selected node type in the dropdown list (e.g. Onstream Farm Dams in Figure 3).
- The user can repeat the above steps to convert nodes to other types. Otherwise, clicking on the Done button can close the window.
Note that Bulk Change Node Models tool also can convert the located nodes to other types such as Supply Points, Gauges, etc. The procedure is the same as the above one for onstream farm dams, and the user just needs to select the expected node type (e.g Supply Points) from the dropdown list instead of Onstream Farm Dams.
Figure 3 Bulk Change Node
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Model editor
Configure Onstream Farm Dams node(s) in the Source model
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