Culvert & Deck / Roadway Help

[TonyL]

Hi

Thank you for your helpfull forum!!

I am new to Hec-Ras and feel that I should have found the solution to this in all the literature I have read this far, but alas . . . .

I am struggling to get a culvert and deck/roadway correct. Below is a screen shot of the profile plot after running a steady flow analysis:

From this you can see that the upstream embankment of the roadway is going the wrong way?

Below are the culvert and roadway input screens:

Your help will be much appreciated.
Tony

[Marulke]

Tony,
I am not sure exactly what your question is, but after looking at your screenshots I have some comments:

1) The bottom of the cross section at the upstream (US) end of the culvert is well above the culvert entrance. This is probably an error?

2) The high chord of the roadway at the US end is at approximately the same height as the US cross section. This is not impossible, but I had expected the roadway to be well above the ground level.

3) Does the distance from the US cross section and the length the culvert fit with the distance between the US and DS cross section? They dont have to be equal, but the culvert appears to be placed to far downstream.

Suggestion: Check your geometry again.

Hope this helps.
Marulke

[KellyHH]

In the deck editor, it looks like you’re using the same stationing for both the upstream and downstream sides; however, from what I can see of the bounding cross sections, the channel has different stationing in each location (~100 upstream, ~20 downstream).

The likely fix is to adjust the stationing of the upstream bridge deck to center it on the upstream channel area. That is, your upstream and downstream bridge decks will not have the same stationing, and may not have the same elevations, or even the same number of points.

[TonyL]

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From: “lieboldt .” <[email protected]>
Date: Tue, 19 May 2015 10:10:13 +0000
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Subject: Re: Culvert & Deck / Roadway Help
To: “KellyHH [via HEC-RAS Help]”
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KellyHH you nailed it! Thank you. It would seem that the upstream bridge
deck stationing must be relative to the upstream section and the downstream
one relative to the downstream section.

Tony

On Wed, May 13, 2015 at 7:09 PM KellyHH [via HEC-RAS Help] < [email protected]> wrote:

> In the deck editor, it looks like you’re using the same stationing for
> both the upstream and downstream sides; however, from what I can see of t=
he
> bounding cross sections, the channel has different stationing in each
> location (~100 upstream, ~20 downstream).
>
> The likely fix is to adjust the stationing of the upstream bridge deck to
> center it on the upstream channel area. That is, your upstream and
> downstream bridge decks will not have the same stationing, and may not ha=
ve
> the same elevations, or even the same number of points.
>
> ——————————
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KellyHH you nailed it!=C2=A0 Thank you.=C2=A0 It would see=
m that the upstream bridge deck stationing must be relative to the upstream=
section and the downstream one relative to the downstream section.

Tony

On Wed, May =
13, 2015 at 7:09 PM KellyHH [via HEC-RAS Help] <[email protected]<= /a>> wrote:

8ex;border-left:1px #ccc solid;padding-left:1ex">

In the deck editor, it looks like you're using the same stationing for=
both the upstream and downstream sides; however, from what I can see of th=
e bounding cross sections, the channel has different stationing in each loc=
ation (~100 upstream, ~20 downstream).

The likely fix is to adjust the stationing of the upstream bridge d=
eck to center it on the upstream channel area.=C2=A0 That is, your upstream=
and downstream bridge decks will not have the same stationing, and may not=
have the same elevations, or even the same number of points.

=09
=09
=09

---

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

http://hec-ras-help.10911=
12.n5.nabble.com/Culvert-Deck-Roadway-Help-tp1640p1646.html

=09
To unsubscribe from Culvert & Deck / Roadway Help, click here.
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