Dam break routing

[Robert]

Hi

I am solving dam break routing for the earth dams.
I computed a hydrographs for dam break shape on the software BREACH, there is a peak flow 24710 cf3/s in time 3h0m. In the end CrossSection (0) is the peak flow 17650 cf3/s in time 8h30m. My solved area is long 12.4 miles.

Question:
Can you be decrease peak flow only abou 10590 ft3/s for the distance 12.4 miles?

Notice, my unsteady model is stabilized !!!

thank you very much
Greetings!

[Chris G.]

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Subject: Re: Dam break routing
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Yes, especially if it’s a fairly confined reach(ie like a canyon).=20

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> On Oct 8, 2014, at 2:05 PM, RobertS [via HEC-RAS Help] wrote:
>=20
> Hi=20
>=20
> I am solving dam break routing for the earth dams.=20
> I computed a hydrographs for dam break shape on the software BREACH, there=
is a peak flow 24710 cf3/s in time 3h0m. In the end CrossSection (0) is the=
peak flow 17650 cf3/s in time 8h30m. My solved area is long 12.4 miles.=20
>=20
> Question:=20
> Can you be decrease peak flow only abou 10590 ft3/s for the distance 12.4 m=
iles?=20
>=20
> Notice, my unsteady model is stabilized !!!=20
>=20
> thank you very much=20
> Greetings!=20
>=20
> If you reply to this email, your message will be added to the discussion b=
elow:
> http://hec-ras-help.1091112.n5.nabble.com/Dam-break-routing-tp1021.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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Yes, especially if it’s a fairly confined reach(ie like a canyon). 

Sent from my iPhone

On Oct 8, 2014, at 2:05 PM, RobertS [via HEC-RAS Help] <[email protected]> wrote:

Hi

I am solving dam break routing for the earth dams.

I computed a hydrographs for dam break shape on the software BREACH, there is a peak flow 24710 cf3/s in time 3h0m. In the end CrossSection (0) is the peak flow 17650 cf3/s in time 8h30m. My solved area is long 12.4 miles.

Question:

Can you be decrease peak flow only abou 10590 ft3/s for the distance 12.4 miles?

Notice, my unsteady model is stabilized !!!

thank you very much

Greetings!

---

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

http://hec-ras-help.1091112.n5.nabble.com/Dam-break-routing-tp1021.html

To unsubscribe from HEC-RAS Help, click here.
NAML

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[Robert]

Hi,

I was solving this problem also in LinkedIn.
I got some replies:
1. You could do a comparison analysis by routing the hydrograph in HMS using Muskingum-Cunge.
2. You need to look for volume continuity between the first cross section downstream of the breach and the last model section.

How do you solve it? Can you help me?

thank you very much your time
Greetings!

[Robert]

Hi,
I compared the volume in the first cross section vs. the one downstream end of the model, but in the volume is big dfiference. see link(apendix 1 – 4).
https://drive.google.com/folderview?id=0B6wWUzbPUM0dZUJ4N0ZLT0ZZTDQ&usp=sharing

Hydrographs 1 – 3 are a small difference, but between 3 and 4 are big difference. Where could be the problem ?

thank you very much for you time
Greetings!

[Author]

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