Darwin-calibrator

Question

Hi all, 
 while doing calibration to my model using darwin-calibrator, this error message has been appeared " Model must have at least one demand" . I entered the field data snapshot and chose the roughness group so i don't understand this message.

Scott Kampa · Accepted Answer

Hello, 
 Darwin Calibrator is adjusting roughnesses so that accurate pressures, velocities, and flows are available in the model run (When you compute a WaterGEMS model, the demands will always be satisfied). If the model is not calibrated, attributes like pressure, velocity, and flow and other attributes may not be representative since the true roughness in a set of pipes may be different from the values entered in the model. 
 In a typical system, some demand will be modeled. Because of this, it is expected any system that needs to be calibrated will have some demand. As mentioned in the user notification, you need at least one demand in the model in order use Darwin Calibrator. You can enter demands for the system in a number of ways. The simplest method tends to be through the Demand Control Center, found in the Tools pulldown menu. 
 Regards, 
 Scott Kampa 
 Bentley Technical Support

MPachlhofer · Answer

M.Fathi, 
 To add to what Scott said if you want to add demands to your model the quickest way to do that is through the demand control center. You can access it by going to Tools > Demand Control Center and inputting some demands. 
 Regards, 
 Mark