Steady-state (constant) river water depth
When running a steady-state simulation that includes SZ-river exchange, a constant water depth may be specified for the river network, which can be used to calculate the head gradient driving the exchange flow.
If a constant river water depth is not specified, then the river water levels are determined in the following order
1. MIKE SHE hot-start water level, if MIKE SHE hot-start is specified
2. Initial water levels from MIKE Hydro River, if the MIKE Hydro River coupling is used
3. Water level equal to the river bed if not 1) or 2) - (i.e. dry river - no flow from the river to the aquifer).