The urban Model Defaults window
  • 05 Aug 2022
  • 2 Minutes to read
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The urban Model Defaults window

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Article Summary

The Model Defaults window is used to specify the defaults to be applied to your 1D urban network and associated simulation.
The window is split into three tabs. Each provide further functionality in a toolbar along the bottom.


ID Labels tab

The ID Labels tab specifies a prefix and incremental number to be provided as the name/label of new nodes and links added to your urban network. These labels can also be edited further within individual nodes/links once created.

Subcatchments tab

The Subcatchment tab specifies defaults to be applied to new subcatchments.

The Area can be left at 0 and new Subcatchments will have the area automatially calculated from the shape drawn on the map. There are also several Additional Subcatchment parameters that can be specified here.

The Infiltration Model can be selected from a drop-down. Note that if you adjust this model, a pop-up will ask if you want to apply the adjustment to any existing Subcatchments. The same infiltration model must be applied to all Subcatchments, and is specified in the Model Settings. It is recommended to select your infiltration model before adding any Subcatchments.

Nodes/Links tab

The Nodes/Links tab specifies the remaining defaults to be applied to the urban network.

Default values for Node parameters can be defined. The Link length will apply to Conduit links, alongside Pump, Orifice, Weir and Outlet links. This value can be left at 0 and new links will have the length automatially calculated from the line drawn on the map. A default geometry and roughness can also be provided as Additional link parameters.

The Units to be used are chosen here. We recommend these are selected prior to building your urban network.

The Offset convention can be adjusted from depth to elevation if required. Conduit links can have an offset specified at the inflow and outflow ends. This setting indicates whether these offset values are depths (distance from the invert level of the inflow/outflow node) or elevations. 

Routing Settings are also provided here. Dynamic Wave is the most sophisticated routing method available. More on routing methods can be found in the Urban Simulations section. In Dynamic Wave routing, the Force Main equation may apply to calculate friction losses if your Conduits become pressurised.

Toolbar functionality

The toolbar of the Model Defaults window provides the following functionality:

Save as defaults for all new projects checkbox - tick this to apply the current settings to new projects you start. 

OK  - saves changes and closes the Climatology Editor window.

Cancel - closes the Climatology Editor window without saving any changes made.

Help - opens the user manual

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