| Applies To | |||
| Product(s): | CivilStorm, SewerGEMS, SewerCAD | ||
| Version(s): | 08.11.XX.XX and later | ||
| Area: | Modeling | ||
| Original Author: | Nancy Mahmoud, Bentley Technical Support Group |
Zero flow is seen for catchments, conduits, etc., despite having entered storm data and/or sanitary loading, and no issues found during validate or compute.
Why do I see no flow after computing the model?
If you are using the Implicit or Explicit numerical solver in SewerGEMS or CivilStorm, or if you are using an EPS with the GVF-Convex solver in SewerGEMS or SewerCAD, the problem may be that you are looking at time zero, before the storm has started or before sanitary loading has filled the initially dry pipes. These solvers perform an unsteady simulation and the pipes may be starting in the dry position (and storms typically peak some time into the simulation).
Advance the Time Browser or look at a graph of the result (such as flow) to see results over time. To graph the flow right click on the element and choose "Graph", then ensure that Flow (or the other desired result) is selected in the graph series options.
If the flow is still zero, check the data entered for any typos (for example, a common error is to enter a CN of 0.85 instead of 85 for a catchment). Also check for how long you are computing the model. If you are calculating for a short period of time, the runoff may not have had a chance to reach the outflow node.