SWMM-USERS Digest - 10 Jun 2008 to 12 Jun 2008 (#2008-105)
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Topics of the day:
1. Decay coefficient
2. Transition from closed pipe to open channel flow
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Date: Thu, 12 Jun 2008 09:32:24 -0300
From: Stephanie Piers de Raveschoot <stephan...@EPFL.CH>
Subject: Decay coefficient
Hello dear SWMM-users,
I was wondering : when is the decay coefficient for the pollutants used, and
how sensitive is the model to this decay coefficient ? (=what is / are the
equation(s) ?)
Having no real mesured values for the case of my tropical city (in Brazil),
I am looking through literature to try to find values for reasonably
equivalent situations. I therefore wanted to know what weight these
estimations had on my system.
Thank you in advance!
Stephanie.
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Date: Thu, 12 Jun 2008 16:30:07 +0200
From: "Coetzee, Justin" <Justin....@WSPGROUP.CO.ZA>
Subject: Transition from closed pipe to open channel flow
Good day all,
I am currently trying to model a system where a 1.05m pipe discharges
into a 1.05m deep trapezoidal channel.
The slopes stay constant through the transition, however I am finding
routing errors just upstream from this transition.
If one transitions from closed flow to open flow, surely there is no
backwater, as the cross-section widens.
I believe that the error lies in the transition zone from closed to open
- and I would like to know the best way to model this in SWWM.
Regards
________________________________________________________________________
_______________
Justin Coetzee MSAICE
Candidate Engineer
WSP SA Civils and Structural| PO Box 8928 | SONPARK | 1206
Tel: +27 (0)13 752-2457 | Fax: +27 (0)13 752-2189 | Cell: +27 (0)72 997
0118
e-Mail: justin....@wspgroup.co.za
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End of SWMM-USERS Digest - 10 Jun 2008 to 12 Jun 2008 (#2008-105)
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