When computing or validating, one or both of the following red user notifications appear, preventing the model from running:
"GPV curve contains duplicate discharge points."
"GPV curve contains non increasing discharge values."
These messages refer to the Generl Purpose Valve (GPV) headloss curve, which needs to have continuously increasing values in the Flow column.
In the GPV properties (double click the notification to zoom to the GPV), click the property "General Purpose Valve headloss curve", click the dropdown next to it, choose "Edit GPV headloss curves", then examine the curve for any non-increasing values. If the data was pasted in from Excel, check the top of the table for a duplicate 0,0 entry. Look for cases where the flow decreases with headloss, or cases where the same flow value is entered twice. Here are some examples:
User Notification: "GPV curve is undefined"