Hello, I am trying to model a hydraulic tunnel (sewer) than works partially fulled. (L=5000 m.)
In order to estimate/design the ventilation manholes, I would like to know like a program results:
In the conduits and manholes while the water is flowing (the sewer/tunnel is working). Is it possible?
I have tried to do using the USER DATA EXTENSION available but the air flow (l/s) depends of the continuity and mesh equations (please see the following figure) and I am not able to program.
Could I obtain this results in other way?
Thank you for you support.
Kids Regards
Hello Gustavo, SewerGEMS does not calculate the air flow rate above the water surface. I am not aware another product that could do this, but I will ask around.
Perhaps there is a rule-of-thumb for designing the size of the manhole ventilation that you can go by? I have not heard of doing this type of calculation before.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Hello Jesse, and thank you for you answer.
Dont worry, it is a strange and unusual topic.
Withal I have found a research where relate the flow velocity with the air velocity. This, with the free space above the water surface, make possible to estimate the air flow. (of course this formulation doesnt consider the pressure differences (air) between diferents locations along the sewers and the forced air currents with fan/ventilators).
According your question, we havent found any rule-of-thumbs or standard for design or to do this type of calculations.
If you get additional information, please I would appreciate you share it.
Kinds Regards.
Hi Gustavo, I have discussed this with my colleagues and it is indeed a challenging subject. Based on your forum thread plus another similar question from another user recently, the following new Wiki article was created:
Modeling Air Flow in Storm and Sanitary Sewers