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1D/1D dual-drainage simulation. Network simplification. DEMs and Urban Flood Modelling. Dual-drainage concept (1D/1D and 1D/2D) Sewer system (manholes and pipes) Overland system (depressions and flow paths). Overland system. 1D overland flow modelling

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Network simplification

1D/1D dual-drainage simulation

Network simplification


Dems and urban flood modelling
DEMs and Urban Flood Modelling

  • Dual-drainage concept (1D/1D and 1D/2D)

    • Sewer system (manholes and pipes)

    • Overland system (depressions and flow paths)


Overland system
Overland system

  • 1D overland flow modelling

  • Overland system consists of nodes (ponds) andlinks (flow paths), generated using DEM.

  • 2D overland flow modelling

  • Surface divided into small elements (squares orirregular triangles), the flow equations (St. Venant) are based on terrain characteristics derived from the DEM.


Network simplification strategies
Network simplification strategies

  • Pruning: <10m; <300mm

  • Merging: similar hydraulic capacity - difference in dimension of consecutive links <100mm

  • First strategy

    • Simplifications are applied to the sewer network and the overland network simultaneously (1D/1D model)

  • Second strategy

    • Simplifications are applied first to the sewer network and then to the 1D/1D model network, i.e. including the overland flow network




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