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Network simplification

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1D/1D dual-drainage simulation

- Dual-drainage concept (1D/1D and 1D/2D)
- Sewer system (manholes and pipes)
- Overland system (depressions and flow paths)

- 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.

- 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