Calculate stable water level use case (Water Overlay)
For water management purposes it can be relevant to know how water will stabilize throughout the system. This can be in a default situation, where there is a nominal amount of water in- and outflow. This can also be in a situation where the system is under duress, such as with a consistent amount of rainfall. There are multiple possible definitions of a stable water system, but a common characteristic is that the inflow and outflow match up, leading to either a consistent amount of water in the system or a predictable water rise/fall at points of measurement.
For the purposes of this scenario, a simple hydrological model will be assumed, with an inflow of water from an upstream source and a downstream means for water to leave the water system.
Requirements
Before implementing this use-case, make sure you have a basic water model set up. For the specified scenario, the rainfall overlay is recommended, though any variant will work.
Also ensure the following in your project, if possible:
- The hydrological system has appropriate inflows and outflows for the hydrological system.
- The hydrological system has aSURFACE_LAST_VALUE result type, either as main result or as a child result type.
- The simulation is set up to output a reasonable amount of timeframes. For a stabilization case, one timeframe per 12 hours of simulation time is reasonable.
Steps
The use-case can be implemented through the following steps.
- Configure a base hydrological system.
- Ensure the overlay is (re)calculated.
- Inspect the "Surface last value" result overlay.
- In the location where water should stabilize, place a point measurement using the measurement tool.
- If the line in the graph becomes horizontal, that's the time and level at which the water is stable.
- Group
- Water system model
- How to import a GeoTIFF of waterway depths
- How to add Subsidence
- Flooding
- Visualize levee breach from water body inside project area use case
- Visualize levee breach from water body outside project area use case
- Flood wave use case
- Water quality
- How to trace water through project area
- Stationary analyses
- Calculate stable water level use case
Notes
A possibility for water to stabilize is most likely if the water inflow is constant, but the outflow increases as water in the system increases. A weir at the outflow side of the water system can effectuate this.
It's possible that the water does not stabilize, if the water flows in faster than water can leave the water system.
It's possible that the water in the water system is effectively exhausted before stability is reached, if water flows out faster than water water enters the system.