AutoCAD Civil 3D - Stormwater

AutoCAD Civil 3D - Stormwater

Distinguished Contributor
Posts: 182
Registered: ‎09-23-2008
Message 1 of 4 (214 Views)

SSA Culvert help

214 Views, 3 Replies
08-30-2012 01:43 PM

is storage node required for the inlet HW?

if are they set up?


I looked at the culvert example that comes with SSA, and they use storage curve for the storage shape. Does the storage curve have to hold the flow before it enters the culvert?

2015 Civil 3D
Active Contributor
Posts: 32
Registered: ‎12-05-2011
Message 2 of 4 (210 Views)

Re: SSA Culvert help

08-30-2012 01:53 PM in reply to: millermccoy

I believe the storage curve would just give you more accurate head charistericts to calculate inlet vs. outlet control.

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Posts: 182
Registered: ‎09-23-2008
Message 3 of 4 (194 Views)

Re: SSA Culvert help

08-31-2012 08:19 AM in reply to: rdbrennan48

If the storage area is not big enough then there is flow loss that doesn't get into the system...I don't remember HEC 5 taking the HW storage area into account for culvert design.

2015 Civil 3D
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Posts: 53
Registered: ‎04-21-2008
Message 4 of 4 (176 Views)

Re: SSA Culvert help

09-07-2012 05:30 AM in reply to: millermccoy

I would recommend using a stoage curve if you believe that a level pool exists above the culvert.  This is often the case with small culverts with high head.  


If a channel is fairly large and the pool would back up a long ways, make sure you don't include the full length of a channel in the same area where you have created stage-storage data or you are duplicating the storage effect.  If you don't expect a level pool, I'd just put the full length of the channel to the culvert and use a junction for the upstream node. 

Alan Neal, P.E.
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