1D Urban Modelling
    • 06 Oct 2022
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    1D Urban Modelling

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    Article summary

    This section of the manual is all about 1D urban modelling.

    Flood Modeller enables 1D pipe drainage system modelling through its 1D urban solver. These are models that predominantly define subsurface pipe drainage networks, however they can include components to model both infiltration and surface water.

    Flood Modeller's 1D urban solver computes flow depths and discharges using a method based on the equations for shallow water waves in channels - the Saint-Venant equations. Options are provided for steady-state (time invariant) or unsteady simulations. 

    Flood Modeller also provides the option to create fully integrated simulations, linking 1D urban components with 1D river and/or 2D components.

    A 1D simulation always requires a network to represent the 1D components. When modelling a pipe drainage system, a 1D Urban Network describes the system itself.

    Features of the underlying system such as manholes, connections between pipes, and outfalls, are represented using Urban Junction and Outfall Nodes. These specify divides in flow, and details of water leaving the system.

    Flow between nodes is defined by Urban Conduit Links. These provide details of the pipes themselves, such as the geometry, dimensions and roughness.

    Your network may also consist of other Urban Structures and Features. This may include units for storage, pumps to allow water to be lifted to higher elevations, or devices used to regulate flows within the system, such as weirs.

    Urban Inflow will also be required to specify water entering the network. This can be defined directly, or a combination of Rain Gage and Subcatchment nodes can be utilised.

    To set up Urban Simulations, details of timing and run-type must be provided alongside other simulation options. Climatology inputs can also be specified. Urban simulations can be run individually, or in batches.

    If you encounter issues with urban modelling, exploring the Urban Diagnostics will help identify problems and resolve warnings and errors.

    Multiple options are provided for viewing Urban Results, including plots with animation functionality to show water level changing over time. Each chart can be fully formatted to customise as needed, alongside providing various methods for exporting the data for post-processing or use in reports.

    You may also be interested in linking your 1D urban network to a 1D river network or to 2D components. Details of this can be found in the Integrated Modelling section of this manual.


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