| Applies To | |||
| Product(s): | Bentley WaterGEMS, Bentley WaterCAD | ||
| Version(s): | 08.11.XX.XX | ||
| Environment: | N/A | ||
| Area: | Modeling | ||
| Subarea: | |||
| Original Author: | Dan Iannicelli, Bentley Technical Support Group | ||
Problem Description
Why does WaterCAD/GEMS enter intermediate timesteps for Logical Controls when EPANET does not?
Reason
In WaterGEMS this is the expected behavior of a Logical Control.
Instead of determining the exact timestep at which the control would occur (like with simple), it will check every 1/10 of a hydraulic calculation timestep. If a control condition would occur, the action is applied and an intermediate timestep will be created to reflect this.
EPANET does actually do the exact same as WaterGEMS. It is just difficult to visualize within the EPANET reporting results. The EPANET reporting does not show intermediate timesteps directly in the report Table.
However you can visualize the attached Status Report to see that the events are triggered at the exact same times as in WaterGEMS. This seems to be standard across EPANET and WaterGEMS. To visualize the Status Report correctly in EPANET you have to go to Hydraulics Options > Edit and change the Status Report option to FULL.
You will then see the intermediate time step values are identical to the counterparts in WaterGEMS.
This only happens with Logical Controls and is expected behavior. Simple controls will not carry this same logic.
See Also