Discharge

Discharge boundary conditions

Discharge points can be added in the fast flood app. This can be done if you simulate a part of a river system, and provide an inflow boundary condition where the river enters your model area. Alternatively, dam-break scenario’s might be analyzed. Use the marker editor to add discharge points. Click on the marker to edit the discharge value (in cubic meters per second). Run the simulation again to see the results. You can specify the areas for which the discharge boundary condition is active. By default, the condition is applied to all areas. In some cases, low elevation model quality can result in strange flow paths near terrain boundaries. If a river section is the model domain, and a discharge boundary is set at the upper edge, the water might flow towards the wrong edge because of noise in the elevation data. A easy fix for this is to apply a polyline barrier along the upper edge between the model domain and river.

Observing discharge

You can use the shift button to inspect water height, elevation and discharge values within the model domain. A popup will show the values under the current cursor locations. For discharge to show, you have to activate the ‘output discharge’ options in the settings menu.

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