This model demonstrates the use of a Depth-Flow rating curve to simulate discharge from a reservoir. On each time step of the simulation, the elevation of the reservoir water surface is updated and then compared to a set target water elevation to calculate a depth above the target. Below is the calculation:
Depth = Max(Water elevation - Target elevation, 0 m)
The rating curve in this model takes the Depth parameter as an argument and looks up a value of discharge rate, which becomes an outflow request on the Pool element.
This method is useful for conceptualizing an outlet works that increases discharges non-linearly with respect to depth.
Below is a time history chart showing the water level compared to the target and the resulting inflow and reservoir discharges.