Flood Routing

Flood Routing is a method that is applied to describe the processes in the water course, and it is used to predict the temporal and spatial variation of a flood wave, at one ore more points along a water course (river or channel).

The flow in a channel is considered as a part of the inflow:

Inflow/Outflow hydrograph of a flood wave

The figure above shows for flood wave propagation in natural channels, two important phenomena:

  • attenuation of the peak flow

  • time lag

Flow routing is classified as either:

  • hydraulic (distributed) computation methods which employ both, the equation of continuity and the equation of motion (momentum conservation). It models the integral movement process of the water in the channel, but in engineering practice one and two-dimensional models are commonly in use.
  • hydrologic (lumped): used for rainfall runoff models. They concentrate on the water strand and treat it as a linear reservoir of the volume V(t) that is changing with the outflow Qout(t) as follows:

Main equations for steady flow conditions:


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Module
Hydrological modelling
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TUHH

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