SWMM-USERS Digest - 24 Nov 2009 to 25 Nov 2009 (#2009-123)

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There are 2 messages totalling 73 lines in this issue.

Topics of the day:

1. Question about side flow weir... (2)

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Date: Wed, 25 Nov 2009 13:54:42 -0800
From: "Pang, Joseph" <Josep...@SEATTLE.GOV>
Subject: Question about side flow weir...

Hello SWMMers,

I would like to confirm how SWMM5 models side flow weir. Does it use Q=f(H^5/3) to model side flow weir and it does not account for the effect of approach velocity? I have read it in some SWMM documentation/discussion but I'm not sure how official those documentation/discussions are. Thanks for your information and confirmation.

Regards,
Joseph

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Date: Wed, 25 Nov 2009 15:16:20 -0700
From: Robert Dickinson <Robert.E....@US.MWHGLOBAL.COM>
Subject: Re: Question about side flow weir...

Hi Joseph,

SWMM 5.0.018 uses the equation

Q = Cd * *Length * h^5/3 for flow in the positive direction if you use a side flow weir

Q = Cd * *Length * h^3/2 for reverse flow.

It does account for the loss through a weir flap gate using the Armco head loss from a flap gate but does not use the approach velocity. There was a comment in the SWMM 4 code about the approach velocity but the approach velocity was always assumed to be zero.

Robert E Dickinson
Technical Engineering Specialist
MWH Soft, Inc
9340 Pontiac Drive Tel: 813-712-0664
Tampa, Florida, 33626 Alt: 813-494-2919
USA
robert.d...@mwhsoft.com
www.mwhsoft.com


-----Original Message-----
From: SWMM-USERS [mailto:SWMM-...@listserv.uoguelph.ca] On Behalf Of Pang, Joseph
Sent: Wednesday, November 25, 2009 4:55 PM
To: SWMM-...@listserv.uoguelph.ca
Subject: [SWMM-USERS] Question about side flow weir...

Hello SWMMers,

I would like to confirm how SWMM5 models side flow weir. Does it use Q=f(H^5/3) to model side flow weir and it does not account for the effect of approach velocity? I have read it in some SWMM documentation/discussion but I'm not sure how official those documentation/discussions are. Thanks for your information and confirmation.

Regards,
Joseph

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End of SWMM-USERS Digest - 24 Nov 2009 to 25 Nov 2009 (#2009-123)
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