Weir angle (Water Overlay)

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Weir angle explain (Water Overlay).png

The weir angle is used to convert a weir loaded in as point-based data to a line which is used in the simulation to define from where to where the water should flow across the weir. In the Water Wizard a weir angle is automatically generated. There are currently 4 options on how this is (automatically) generated:

  1. The weir is located on the edge of 2 water level areas. The weir is then automatically installed correctly and no message is displayed. A note about this option is necessary: The weirs are automatically well oriented, but the waterways are not blocked, which means that water can flow past the weirs. That is why we recommend using a dataset in which the attribute is already present, because then the block is in effect.
  2. The weir is located in exactly 1 level area. Then the warning appears that the weir has no angle, with the option to fix it.
  3. The weir is located in exactly 0 level areas. Then a comment is displayed about the absence of a water level area.
  4. The weir angle attribute is pre-added to a dataset and this dataset is imported into the project. No angle needs to be generated automatically.
The weir angle is adjustable in the weir step of a Water Overlay wizard


  • The width of the generated dam is equal to the weir's WEIR_WIDTH, multiplied by the WEIR_DAM_MULTIPLIER of the Water Overlay.
  • If a weir angle is available for a weir which is already line-shaped, the weir is first interpreted as a point, and then the direction and elevation are adjusted accordingly. The centre of the weir's polygon is used.
  • If no angle is available as an attribute, the angle weir angles are automatically oriented based on the water level areas.
  • The weir angle is automatically converted to a range within 0 and 360.

See also