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When computing Darwin Designer, the following error message is generated: "Value does not fall within the expected range."
This error could be due to the values included in the boundary override for a reservoir or tank. Boundary overrides are used in Darwin Designer and Darwin Calibrator to adjust the status or elevation of a boundary element at the time of the field test. For instance, say that at the time of the field test, the elevation of a tank is 100 feet, but the model is reporting a value of 95 feet. In order to get the most accurate results, you would use a boundary override to adjust the tank elevation to 100 feet during the calculation of the model.
However, if a value used as a boundary override falls outside of the operating range of the tank, you might receive an error message saying "Value does not fall within the expected range." If the error occurs, confirm that the boundary override value falls within the operating range of the tank (the minimum and maximum elevation). If using Level as the range type, be sure to add the base elevation to the min and max level to determine the min and max elevation.
If you are using a reservoir in boundary overrides, you will want to revisit this. Reservoirs are considered infinite sources of flow and it is assumed that the elevation or hydraulic grade does not change. If the elevation of the reservoir needs to be adjusted, it should be adjusted in the main model properties rather than the boundary overrides.
Using Darwin Designer to design pipes in WaterGEMS