In this chapter an example for a steady one-dimensional simulation is discussed. The project area is located in Northern Germany close to Hamburg. The river R is flowing through the villages A (km 69.066) and B (km 58.450). Both endings have a gauging station. This section of the watercourse R, which is simulated by a one-dimensional model, is 10,62 km long between A and B. The final result is the outline of inundation under a design flood events.

Normally the distance between cross sections for a 1D-simulation is about 50 to 100 m long. The distance must be reduced, if the longitudinal shape of the river meanders to a high degree, the riverbed slope changes or the geometry of the river varies intensely. Therefore a survey with echo sounders and blower-sonars is made in order to collect topographical data.

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