Inline Structure

[Greg Garrison]

I am trying to simulate flood flow in a trapezoidal concrete channel with full spanning flash boards that are perpendicular to the flow path. I am currently using inline structures to mimic the flash boards.

Does HEC-RAS assume a zero approach velocity for the weir equation used to predict flow over the flash boards and if so, would that have a significant impact on the predicted WSE’s from RAS?

Thank you in advance for any assistance,
Greg

[Anonymous]

The standard weir equation does not have an approach velocity, so no, I do not think RAS is taking it into account.
I’m not sure how much difference it would make. How high of velocities are you expecting? I don’t have any specific suggestions but you could adjust the weir coefficient value to try and account for the approach velocity.

[Greg Garrison]

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From: “Greg Garrison”
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Thanks for the response. I am seeing some pretty high velocities in the
channel, so I would assume the effect would be negligible if there was one.

Thanks again,

Greg K. Garrison

Staff Engineer

Waterways Consulting, Inc.

403 Swift St. Suite B

Santa Cruz, Ca. 95060

(831) 421-9291

http://www.watways.com <http://www.watways.com/> / [email protected]

From: jarvus lunt [via HEC-RAS Bloggery Forum]
[mailto:[email protected]]
Sent: Friday, August 16, 2013 3:46 PM
To: Greg Garrison
Subject: Re: Inline Structure

The standard weir equation does not have an approach velocity, so no, I do
not think RAS is taking it into account.
I’m not sure how much difference it would make. How high of velocities are
you expecting? I don’t have any specific suggestions but you could adjust
the weir coefficient value to try and account for the approach velocity.

_____

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Thanks for the response. I am seeing some pretty high velocities in =
the channel, so I would assume the effect would be negligible if there =
was one.

 

Thanks again,

 

Greg  K. Garrison

Staff Engineer

Waterways Consulting, Inc.

403 Swift St. Suite B

Santa Cruz, Ca. 95060

(831) 421-9291

ww=
w.watways.com =
/=
=
[email protected]

 

From:=
=
jarvus lunt [via HEC-RAS Bloggery Forum] =
[mailto:[email protected]]
Sent: Friday, =
August 16, 2013 3:46 PM
To: Greg Garrison
Subject: =
Re: Inline Structure

 

The standard weir equation does not have =
an approach velocity, so no, I do not think RAS is taking it into =
account.
I’m not sure how much difference it would make.  How =
high of velocities are you expecting?  I don’t have any specific =
suggestions but you could adjust the weir coefficient value to try and =
account for the approach velocity.

---

If you reply to this email, your message will be added to the =
discussion below:

http://hec-ras-bloggery-forum.1091112.n5.nabble.com/I=
nline-Structure-tp266p269.html

To unsubscribe from Inline Structure, click here.
NAML =

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