ABSTRACT
An urban flood model uses a numerical representation of the flow. A hydrodynamic model of flooding is used to simulate the flow and represent how the flood could happen. An urban flood model can normally be divided into two major sub-models which are interrelated. Hydrological models are simplified, conceptual representations of part of the hydrologic cycle. An alternative approach that might be termed a surface water budget approach incorporates the loss mechanism into the catchment model. In a one-dimensional model, the network is composed of pipes and manholes. Pipes or open channels are represented by links while manholes are nodes that can also represent basins and outlets. The hydrodynamics of this model are represented by the Saint Venant equation, which take into account conservation of mass and momentum, generating equation for computation to calculate the water levels and the flows on the street and in the sewer pipes.
