How to investigate increasing water levels in waterways
When using the Water Overlay, water should generally be in balance. Extraordinary events such as breaches or excessive rainfall may cause an excess of water to be added to (and possibly remain in) the model. But in general, and especially in stationary calculations, you would expect the amount of water flowing into the model to roughly balance the amount of water being removed from the water as well.
How to check whether water flows properly
You may be able to see visually on the overlay where potential issues exist, but by placing a measurement in the waterway you will be able to see more accurately how much water is where in the waterway.
- Ensure the Water Overlay has a surface last value result type and a surface elevation.
- Open the measuring tool.
- Create a line measurement, with one endpoint at the start of the waterway, and the other endpoint at the end of the waterway.
- Set the primary overlay to surface last value, the base overlay to surface elevation, and activate "sum".
- Set the measurement graph display mode to "fit to graph".
- You now see the water level across the length of the waterway.
See if the resulting summed line is (nearly) flat, or if there is a point where the water level suddenly jumps to a different level.
What can you look for when a flow issue occurs
Because inhibited waterflow can have a number of causes, there isn't a single fix for all situations. Check whether any of the following apply to your situation, and interpret in the context of your own use-case what the desirable solution would be.