Water depth and level rasters

In the calculation subgrid pixel level is taken into account. However Rana stores only the water level in each computational cell for each output time step. To show the pixel resolution that was used in the calculation the DEM needs to be subtracted from the water level. This results in a raster with a water depth value for each pixel.

For some applications, it is useful to have water levels as a raster file. For example, to use them as Initial water levels in the next simulation.

Two Rana Processing Algorithms allow you to make such water depth and water level rasters from Rana results: Maximum water depth/level raster and Water depth/level raster. Access these processing algorithms via Main menu > Processing > Toolbox > Rana Results Analysis > Post-process results.

Both tools have the option to spatially interpolate the water levels. This is recommended to use if the water level gradients are large, such as is often the case in sloping areas.

The resolution of the output rasters is equal to the resolution of the DEM.

Note

If these tools give unexpected results, please make sure you have used the correct computational grid file (gridadmin.h5) and the correct DEM.

Water depth difference

Computes the difference between two water depth rasters. The result is automatically styled and added to your map layers.

Water depth/level raster (maximum)

This tool first calculates the maximum water level that occurs in each cell during the simulation, before interpolating and/or subtracting the DEM values.

Water depth/level raster (multiple time steps)

This tool can be used to generate a series of water depth or water level rasters.

Water depth/level raster (single time step)

This tool can be used to generate a water depth or water level raster for a specific time step, for example, at the end of the rainfall event. It also allows you to export a set of rasters for a range of time steps.