AutoCAD Civil 3D - Stormwater

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Member
Posts: 3
Registered: ‎08-21-2012
Message 1 of 6 (261 Views)

Total inflow/Total Outflow

261 Views, 5 Replies
08-22-2012 02:14 PM

Would anyone have any idea why my model shows an event mean storage of 20396 cf when I dont have any storage nodes? How is the model storing that amount of water? I'm thinking this is why my total inflow doesnt match my total outflows? 

Valued Mentor
fcernst
Posts: 997
Registered: ‎01-07-2011
Message 2 of 6 (202 Views)

Re: Total inflow/Total Outflow

12-03-2012 06:30 AM in reply to: ryannn

SWMM computes storage in all of the links and nodes, not just storage nodes.

 

SSA says it uses the SWMM engine, but they don't say what version, or what modifications, if any, they have done to it.

Ernst Engineering
Fred Ernst, PE
C3D 2014 SP1
W7x64; i7 8gb; Radeon HD 5700
www.ernstengineering.com
Employee
Matt.Anderson
Posts: 2,901
Registered: ‎05-13-2005
Message 3 of 6 (193 Views)

Re: Total inflow/Total Outflow

12-03-2012 07:25 AM in reply to: fcernst

Ryan -

 

Sounds like your model might not be completely draining during the event duration. 

 

Fred -

 

EPA SWMM hydraulic calculation engine for SSA 2013 should be 5.0.21 or 22. 



Matthew Anderson, PE
Product Manager
ICP
Autodesk, Inc.

Valued Mentor
fcernst
Posts: 997
Registered: ‎01-07-2011
Message 4 of 6 (189 Views)

Re: Total inflow/Total Outflow

12-03-2012 08:30 AM in reply to: Matt.Anderson

Thanks Matt.

 

Just curious, how can you not be sure of the version in 2013 now? It says here you're an employee, is that right?

Ernst Engineering
Fred Ernst, PE
C3D 2014 SP1
W7x64; i7 8gb; Radeon HD 5700
www.ernstengineering.com
Employee
Matt.Anderson
Posts: 2,901
Registered: ‎05-13-2005
Message 5 of 6 (184 Views)

Re: Total inflow/Total Outflow

12-03-2012 08:36 AM in reply to: fcernst

Fred -

 

Yes, I am an employee. 

 

The difference between the EPA SWMM 21 & 22 engines are a couple of "engine update" changes that I am not 100% certain are covered.

 

 



Matthew Anderson, PE
Product Manager
ICP
Autodesk, Inc.

Valued Mentor
fcernst
Posts: 997
Registered: ‎01-07-2011
Message 6 of 6 (181 Views)

Re: Total inflow/Total Outflow

12-03-2012 08:50 AM in reply to: Matt.Anderson

Sorry, but I don't understand your logic there... it should be just clear...What SWMM version?

 

It should also be listed in the About under the software Help, like most software list their versions and updates. then in your methodology section, talk about any differences between the SSA engine and the SWMM engine, any modifications.

 

Example: "We are using SWMM version 5.0.022, however we are not using the LID capabilties", etc...

Ernst Engineering
Fred Ernst, PE
C3D 2014 SP1
W7x64; i7 8gb; Radeon HD 5700
www.ernstengineering.com

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