HEC RAS 2d BC critical depth

[CanJu]

Hi all,
I’m about to model a small artificial channel with HEC RAS 2d which also consists of a wire at the end of my model area. Since hec ras does not bring very accurate results with the modeled wire i was thinking to define the outflow BC at the wire and set it to critical depth.
But now I’ve seen that RAS 2d doesn’t include that option. I’m wondering why?

Beside that is there anything wrong in setting my outflow BC to critical depth?

Thanks for any help.

Cheers

[Anonymous]

You can do this a couple ways. You can set a normal depth to something artificially high (like 0.5) and the software will treat it as free outfall.

The other option which is better but more tedious is to draw a 1d storage area at the downstream end of your model and connect it to the edge of your 2D area. Give the storage area an artificially low elevation (if the outfall terrain is at 100-ft put your storage area a bottom elevation of 10-ft) and give it unlimited storage by typing 1000000000 or hold down zero until it stops. Set your connector to the exact elevation of the terrain and change the weir coefficient to 0.2 (VERY IMPORTANT). This also will be treated as free outfall. I notice very odd results if i do not put my 1D storage elevation editor much much lower than the terrain, i usually do 1-200-ft below the terrain at the connection.

Question: what do you mean a “wire”???

[CanJu]

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References: <[email protected]> <[email protected]>
In-Reply-To: <[email protected]>
From: Julia Cancola
Date: Fri, 12 Oct 2018 07:55:34 +0200
Message-ID:
Subject: Re: HEC RAS 2d BC critical depth
To: “Luis Partida [via HEC-RAS Help]”
Content-Type: multipart/alternative; boundary=”000000000000d9c860057801bc09″

–000000000000d9c860057801bc09
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Sorry WEIR, it should be.

Thanks a lot for replying.

On Thu, 11 Oct 2018, 21:30 Luis Partida [via HEC-RAS Help], < [email protected]> wrote:

> You can do this a couple ways. You can set a normal depth to something
> artificially high (like 0.5) and the software will treat it as free
> outfall.
>
> The other option which is better but more tedious is to draw a 1d storage
> area at the downstream end of your model and connect it to the edge of yo=
ur
> 2D area. Give the storage area an artificially low elevation (if the
> outfall terrain is at 100-ft put your storage area a bottom elevation of
> 10-ft) and give it unlimited storage by typing 1000000000 or hold down ze=
ro
> until it stops. Set your connector to the exact elevation of the terrain
> and change the weir coefficient to 0.2 (VERY IMPORTANT). This also will b=
e
> treated as free outfall. I notice very odd results if i do not put my 1D
> storage elevation editor much much lower than the terrain, i usually do
> 1-200-ft below the terrain at the connection.
>
> Question: what do you mean a “wire”???
>
> ——————————
> If you reply to this email, your message will be added to the discussion
> below:
>
> http://hec-ras-help.1091112.n5.nabble.com/HEC-RAS-2d-BC-critical-depth-tp=
6492p6503.html
> To unsubscribe from HEC RAS 2d BC critical depth, click here
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Sorry WEIR, it should be.=C2=A0

Thanks a lot for replying.=C2=A0

On Thu, 11=
Oct 2018, 21:30 Luis Partida [via HEC-RAS Help], <[email protected]>=
wrote:

ex;border-left:1px #ccc solid;padding-left:1ex">

You can do this a couple ways. You can set a normal depth to something art=
ificially high (like 0.5) and the software will treat it as free outfall.=
=20

The other option which is better but more tedious is to draw a 1d s=
torage area at the downstream end of your model and connect it to the edge =
of your 2D area. Give the storage area an artificially low elevation (if th=
e outfall terrain is at 100-ft =C2=A0put your storage area a bottom elevati=
on of 10-ft) and give it unlimited storage by typing 1000000000 or hold dow=
n zero until it stops. Set your connector to the exact elevation of the ter=
rain and change the weir coefficient to 0.2 (VERY IMPORTANT). This also wil=
l be treated as free outfall. I notice very odd results if i do not put my =
1D storage elevation editor much much lower than the terrain, i usually do =
1-200-ft below the terrain at the connection.

Question: what do you mean a "wire"???

=09
=09
=09

---

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

http://hec-=
ras-help.1091112.n5.nabble.com/HEC-RAS-2d-BC-critical-depth-tp6492p6503.htm=
l

=09
To unsubscribe from HEC RAS 2d BC critical depth, click here.<= br>
NAML

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