AutoCAD Civil 3D - Stormwater

AutoCAD Civil 3D - Stormwater

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Registered: ‎11-28-2012
Post 11 of 14

Re: total inflow and vs. catchbasin flow

01-25-2013 09:42 AM in reply to: fcernst

I agree completely. There is this elaborate program that can do all this analysis using different methods and something as seemingly simple as using a DTM. As part of my thesis several years ago, I interacted with the DTM to using information to perform TR-55 analysis before all this stuff came out, and I am NO WHERE NEAR the level of programmer that is at Autodesk. Hopefully they look at these forums and get ideas of what they need to work on for the next realease. As far as Civil 3D itself, I do not know of any other inhancements that I would need other than what they have already made...other than this interaction with the DTM in SSA. It interacts nicely in C3D to find the catchments and flow paths (wish that was there when I was in my masters!) and everything. We will see...

 

Rich Bauer, MS, PE, SIT, M.ASCE

Engineering Department Manager

RB & Associates Consulting, Inc.

Web site www.rb-associates.net

Rich Bauer, MS, PE, SIT, M.ASCE
Engineering Department Manager
RB & Associates Consulting, Inc.
www.rb-associates.net
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Registered: ‎03-24-2009
Post 12 of 14

Re: total inflow and vs. catchbasin flow

01-28-2013 03:36 PM in reply to: rdbauer50

i remember based on my testing on recent project work models that this feature does not "affect" results obtained by using the rational method as the computational method. it affects when using SCS TR-20 (and possibly TR-55) with structures (inlets).

 

the last time i faced this issue, i ended up using ponded area 100 sf as recommended by other folks here, and checked each structure/pipe for inflow/outflow mass balance (inflow from drainage area as CiA + bypass from upstream inlet = flow in the downstream pipe and so on). i will run some quick tests using the EPA SWMM computational engine and post back with results when i have time.

Avishek Chhibber, P.E., CFM
Civil 3D 2014 SP2, Win 7-64 bit
8GB RAM
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Registered: ‎11-28-2012
Post 13 of 14

Re: total inflow and vs. catchbasin flow

01-29-2013 12:12 PM in reply to: Hidden_Brain

From what I am seeing, it does make a difference as far as the Flow Depth. Attached are the 2 "tests" I did. The ONLY difference in the 2 runs is the ponded area. I am using the rational method. The funny thing is that the gutter spread stays about the same but the depth doesn't. I am going to try TR-55 and see what happens.

Rich Bauer, MS, PE, SIT, M.ASCE
Engineering Department Manager
RB & Associates Consulting, Inc.
www.rb-associates.net
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Registered: ‎11-13-2006
Post 14 of 14

Re: total inflow and vs. catchbasin flow

07-03-2013 11:34 AM in reply to: Wlewinski

thank you!  it works at least in one case; is 100 a magic number?  or it is a way to estimate it?

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