Problem

When computing or validating the model the following user notifications appear.

• Multiple point pump curve contains non-increasing flow points.
• Pump curve contains non decreasing head values with significant variation and could indicate error in data entry.

Solution

Check the pump definition input data.

The top value should have the lowest flow (typically 0). The following points should have gradually increasing flow values, with the bottom flow value being the largest.

Inversely, the top point should have the highest head value. The following points should have gradually decreasing head values, with the bottom head value being the smallest (typically 0).

Incorrect Input:

Correct Input:

See Also

Graph of multiple point pump curve not matching values in table