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Source allows the user to create the catchment model though Geographic Wizard conveniently. However, before Source version 4.10.0 - Beta Release (August 2019), the user cannot change the created sub-catchment boundary such as merging sub-catchment after Geographic Wizard creates the scenario.  The new function was developed to merging sub-catchments and reset relevant model elements (such as network/link) and attributes (such as rainfall runoff model parameters) in an existing catchment catchment model. The developed function has been included in the Source software tool after the version 4.10.0 – Beta Release.

There are two methods developed for combining sub-catchments: (a) at selected node boundaries and (b) from selected catchments.  Both methods are described below in this page.

First of all, the user needs a Source project with any geographic scenario and open the project.

Combine Catchments At Selected Node Boundaries:

This method allows the user to combine all catchments upstream of the selected node such as a confluence in a catchment model.

The procedure to combine catchments At selected node boundaries is illustrated as follows:

  • Click on a single node from the interface to select this node, such as the confluence orange cycled on Figure 1 ( Node on catchment SC#10 in this example).
Figure 1. Selected the node to start Combine catchments function
  • Right click on the interface’s empty space (that can keep the node selected) to pop up the Geographic Editor.
  • Click on Combine catchments >> At selected node boundaries to display the interface windows of Combine Catchments as Figure 2. At the beginning, the contests under Catchment Group is empty.
Figure 2.  Combine Catchments Interface

  • Click on the button of Find catchment groups at boundaries to display all sub-catchments upstream of the selected node (i.e. Node on catchment SC#10 in this example) in Catchment Groups (shown as Figure 3).
Figure 3.  Combine Catchments at the selected node with all found upstream sub-catchments

Some functions on Figure 3 are given below:

  • To Primary catchment: The property of this sub-catchment will be retained for the combined catchment such as the parameters of rainfall runoff and other models. In this example, primary catchment is SC#13. This node is the single outlet of the combined catchment.
  • Absorbing Catchments: Sub-catchment listed under Catchment (i.e. SC #21, SC #12, SC #20 in this example) will be merged with SC #13 and their properties will be discarded.
  • Assign primary: This button allows the user to change the primary catchment if the user wants to use the property from another sub-catchment for the combined catchment. The user can click on any sub-catchments listed under Catchment, then click on Assign primary. The selected sub-catchment (SC #12 in this example) will be displayed into Primary catchment, and previous primary catchment will be moved to the absorbing catchments.
  • Network Restructure:

         Collapse to primary catchment node – Ticking this function will lead a network with the link from the primary catchment to the outlet. Otherwise, the networks and nodes from all absorbed catchments will be kept as it is.

         Absorb upstream boundary nodes- This function allows to remove all nodes in absorb catchments and it is enabled only when Collapse to primary catchment is ticked. 

  • Combine button will close Combine Catchments Interface; combine the catchments upstream of the selected node, and reset the network and nodes accordingly.
  • Cancel button will close Combine Catchments Interface without any combination action.

Combine catchment from selected catchments:

This method allows the user manually to select the sub-catchments to combine.

The procedure to combine catchments from manually selected sub-catchments is shown below:

  • Manually select the sub-catchments(use the Zoom option to Zoom in to the sub-catchments, and keep Selected Catchment in Layer Manager ticked) as Figure 4
Figure 4.  Manually select sub-catchments for combining catchments 

  • The first catchment selected is deemed to be the Primary Catchment.
  • Right click on the interface to pop up the Geographic Editor including the item/function of Combine catchments as Figure 5.
Figure 5. start combine sub-catchments function from manually select sub-catchments  

  • Click on Combine Catchments >> From selected catchments to pop up the interface Windows of Combine Catchments as Figure 6.
Figure 6.  Combine Catchments Interface for manually selected sub-catchments

  • The elements’ functions on Figure 6  are same as those  on Figure 3 and  the user can refer to details explained before
  • Click on the Combine button on Figure 6 will get a catchment combined from 4 catchments shown in Figure 7
Figure 7.  The result catchment combined from manually selected sub-catchments

  • The associated properties  are changed correspondingly  For example, the new rainfall and runoff table  (Figure 8) shows the sub-catchments #12, #SC 20 and #21 was removed, and the combined catchment inherited the property from SC# 13, primary catchment, such as ID, parameters.
Figure 8.  The result catchment combined from manually selected sub-catchments

  • Save Source project file to keep the combined results.


Note: 

  • The change of combined sub-catchments is unable to reverse.
  • At the moment, the user needs to have a single outlet for all of the sub-catchments combining. The Source will relax this restriction in future versions.
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