Hello, I am working on a Sewergems model with multiple lift stations. I have observed that whenever sanitary flow leaves the pump station, the sanitary population in the downstream pipe, to the lift stations, set to zero; software carries the flow as a pumped flow. Is it correct? I want to take my sanitary flow/population till the end of terminal pump station. Because if the pipes are not carrying the sanitary populations (of pipes upstream to lift stations) after each lift stations, it effects my final peak flow coming to the termimal pump station because total sanitary populations are not reaching until the end. When i match the final flow, it doesn't matches with the sewage flow calculation spreadsheet. I have also provided the infiltration using Inflow control center so I am wondering how the program works if the flow is in the form of "Pumped Flow" with both sanitary and infiltration. Will appreciate your expert advice and solution to this issue. Thanks in advance.
Hello Vivek,
It sounds like the behavior you described is related to the calculation option "Used Pumped Flows". When set to False (default is True), the upstream loading data into the pressure system is used, and give more of a true picture as one moves far downstream from the pressure system and the effects of pump cycling become diminished. In this use case, the user will not want to use the pumped flow. Instead, they would pass loading to the downstream system based on upstream loads and appropriate extreme flow factors similar to the way flows are handled in the gravity system.
See:
In SewerCAD V8i, what is the "Use Pumped Flows" calculation option?
SewerGEMS Help Article - Calculation Option Attributes
I hope this answers your question.
Regards,
Craig Calvin
Bentley Technical Support
Answer Verified By: vivek@ch2m