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To make viewing output easier, it also recommended to add observation points.

Add a model and network

1. Open SOBEK and add a new 'Flow 1D Model' from the 'New Model' button.
2. Take a moment to explore the project explorer and see what components make up a Flow1D model. (If you don't know what the project explorer is, please review these terms here)
3. Open the network

   To build a network you will need to open the central map by double clicking

   Flow1D/input/network from

   on network in the project explorer.

   Start by creating a branch from the Ribbon (tab: Map, group: Network). For now, do not use the 'freeform' tool.
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   If you have opened the central map, the ribbon will show the contextual Map tab (in green). In the Map tab, you can build a network with the tools in the Network group. Explore the icons in this group by hovering above them and reading the popup menu.

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4. Create a network with the 'Add new branch' tool. Draw one branch. Two nodes are automatically created as well.
5. You should now see the something like below in your network. If your network looks differently (too many branches, or curved branches), simply select the branches and press 'Delete' in your keyboard to remove the branches and try again. Image Added  Image Removed
6. Next, we're going to change the coordinates of the nodes. Select a node. In the properties window, change the x, y coordinates and name of the nodes manually to (Name: Begin, x:0 m, y:0 m) and (Name: RiverEnd, x: 350000 m, y:0 m).

7. Add a second branch attached to the first one. Do this by using the 'Add new branch' tool and starting the branch at the end of the last node. Change the coordinate of the third node to (Name: LakeEnd, x:380000 m, y:0 m).

   Info

   If the branches are attached, the node will turn solid green. If this is not the case, you will see two nodes - possible close to each other - with white centers. The white centers denote that it is an end-node, i.e. it is only connected to one branch. This might happen if you clicked to far from the node you want to connect to, or if snapping is not enabled. To enable snapping, press S on your keyboard. Alternatively, you can merge nodes by selecting the new node and editing its coordinates. Nodes will merge automatically if their coordinates are exactly the same.

8. To get an overview of the branches in the model, use the Map explorer to navigate to the flow model/input/network, right-click on branches and select 'Open Attribute table'. You can do this for every component in the model. For example, try to open the attribute table of the nodes in the same way. You should now have a network with two branches and three nodes. 

Add cross-sections

1. To add a cross-section, use the 'Add CrossSection (ZW)' tool and click anywhere on a branch. You can change the name and location (chainage) of a cross-section via the Properties window or its attribute table. In this way, a one cross-section at the beginning of the branch and one at the end of the branch.

2. To define the cross-section definition, double click on the cross-section. Change the cross-section to resemble the compound channel. To use the same cross-section multiple times, you will need to share the cross-section definition. Still in the cross-section view, click  'Share this definition'. If you define a new cross-section somewhere in the model, you can now use the shared cross-section. To impose a slope, change the Level Shift. By imposing a Level Shift, the cross-section definition is uniformly lowered or heightened.

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   Note that other types of cross-section exists as well, viz. 'YZ' and 'XYZ'. However, only ZW profiles can be used in combination with morphology.

3. Create a slope by defining two cross-sections one at

    

    

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