[Chris G.]

Not from the RASController. But you can write a procedure to retrieve the station elevation points and descriptions from the geometry text file. Chapter 4 discusses how to do this. The keywords in the geometry file that you are looking for are: #Sta/Elev and BEGIN DESCRIPTION: / END DESCRIPTION:

[Chris G.]

In the current beta release, no. But what we’ve been using is Snagit, a screen capturing application that also captures video. It works quite nicely. There are other free applications that do the same thing available online.

[Chris G.]

The rapid initial drop in stage in your hydrograph is because you’ve set initial conditions that are not what RAS wants to compute. Try adjusting your initial conditions to match the first time step conditions.

At the upstream end of your reach, the instability can be fixed by one or more of the following:

Higher n values: http://hecrasmodel.blogspot.com/2009/12/n-values-in-steep-streams.html

Tighter cross sections: http://hecrasmodel.blogspot.com/2008/12/samuels-equation-for-cross-section.html

Refinement of HTAB parameters: http://hecrasmodel.blogspot.com/2009/02/crazy-energy-grade-line.html

Turn on mixed flow: http://hecrasmodel.blogspot.com/2011/04/mixed-flow-regime-options-lpi-method.html

This other post may help as well: http://hecrasmodel.blogspot.com/2013/10/stabilizing-dynamic-unsteady-hec-ras.html

[Chris G.]

If you are only running under high flow conditions, just pick anything for low flow. It won’t be used, but at least you can get the model to run.

[Chris G.]

Typically in that situation, I’ve determined a concurrent flood level for the big stream and use that as the downstream boundary condition for your model, to evaluate flooding at the small bridge. If evaluating the small bridge for scour, I suggest using normal depth at the downstream end of your small stream. It’s good to do a sensitivity analysis on the downstream boundary to see what effect (if any) it has on your small bridge.

[Chris G.]

That seems very low for a weir coefficient. If you are interested in getting the hydraulics at the lock itself during the overtopping event, I would suggest modeling it with two inline structures with cross sections in between.

[Chris G.]

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Tue, 31 Mar 2015 06:57:49 -0700 (PDT)
Subject: Re: Reach Junction
References: <[email protected]>
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Make sure the reach lines snap together in GIS. That way GeoRAS will recogni=
ze the junction. If you don’t want to go back to GIS to do this, you can cre=
ate a junction by moving the reach end points on top of each other. Use the “=
Edit…Move Points/Objects” feature.=20

Sent from my iPhone

> On Mar 31, 2015, at 1:00 AM, Ali [via HEC-RAS Help] wrote:
>=20
> Hi every one! I am doing a flood inundation mapping, i had made a hecras g=
eometry file by using hecgeoras but the problem i am facing is that i couldn=
‘t get the automatic junction nodes created at the reaches junction point, s=
o when i run the steady flow analysis it gives me an error that missing boun=
dary condition on downstream side of profile 1. Needs help on this issue…=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/Reach-Junction-tp1490.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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Make sure the reach lines snap together in GIS. That way GeoRAS will recognize the junction. If you don’t want to go back to GIS to do this, you can create a junction by moving the reach end points on top of each other. Use the “Edit…Move Points/Objects” feature. 

Sent from my iPhone

On Mar 31, 2015, at 1:00 AM, Ali [via HEC-RAS Help] <[email protected]> wrote:

Hi every one! I am doing a flood inundation mapping, i had made a hecras geometry file by using hecgeoras but the problem i am facing is that i couldn’t get the automatic junction nodes created at the reaches junction point, so when i run the steady flow analysis it gives me an error that missing boundary condition on downstream side of profile 1. Needs help on this issue…

---

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[Chris G.]

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Subject: Re: Error Message – Permission Denied
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Usually rebooting your computer and then restarting RAS will fix this.=20

Sent from my iPhone

> On Mar 27, 2015, at 1:21 PM, Taylor Sun [via HEC-RAS Help] wrote:
>=20
> Every once in a while I’ll try to run an unsteady model and I’ll get an er=
ror message that pops up saying “Error in Writing Intermediate Computation Fi=
le. Permission denied.” Does anyone know how to get rid of this so I can ac=
tually run the model?=20
>=20
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elow:
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Usually rebooting your computer and then restarting RAS will fix this. 

Sent from my iPhone

On Mar 27, 2015, at 1:21 PM, Taylor Sun [via HEC-RAS Help] <[email protected]> wrote:

Every once in a while I’ll try to run an unsteady model and I’ll get an error message that pops up saying “Error in Writing Intermediate Computation File. Permission denied.”  Does anyone know how to get rid of this so I can actually run the model?

---

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[Chris G.]

“Breaking the HEC-RAS Code” is a book that completely documents the HECRASController procedures for Visual Basic Applications (VBA). You can get more information and order the book from here: http://hecrasmodel.blogspot.com/p/book.html or from most online book retailers. There is also available an Excel Workbook with example code for every HECRAS procedure plus many other example applications that use the HECRASController. You can get that at the same link above.

[Chris G.]

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Subject: Re: Weird Error Message
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Try rebooting windows. If that doesn’t work, you’ll need to reinstall HEC-RA=
S.=20

Sent from my iPhone

> On Mar 12, 2015, at 4:46 AM, Nathan [via HEC-RAS Help] wrote:
>=20
> I can’t seem to open HEC RAS Anymore, its giving me an error message that s=
ays=20
>=20
> “Unexpected Error; Quitting”=20
>=20
> any ideas?=20
>=20
> If you reply to this email, your message will be added to the discussion b=
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> NAML

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Try rebooting windows. If that doesn’t work, you’ll need to reinstall HEC-RAS. 

Sent from my iPhone

On Mar 12, 2015, at 4:46 AM, Nathan [via HEC-RAS Help] <[email protected]> wrote:

I can’t seem to open HEC RAS Anymore, its giving me an error message that says

“Unexpected Error; Quitting”

any ideas?

---

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[Chris G.]

In the geometry schematic, hover your mouse cursor over the point where you would like each vertex in your “copied” cross sections to be. There’s a x-y coordinate readout in your geometry schematic on the lower right. Record those points. You may have to zoom in pretty close to get the precision in your coordinate points that you’d like. Then go to GIS Tools…XS Cutlines Table, and enter in those coordinate points for each of your copied cross sections.

[Chris G.]

Use an inline structure and put in a gate. Then select “User-Defined” for you gate type.

[Chris G.]

Thanks for sharing this Thomas. I trust you got it to work.

[Chris G.]

Thanks for the shout-out Jonathan!

[Chris G.]

This is no problem. It just means that RAS had already computed the internal HTAB curves and didn’t need to recompute them. You’re good.

[Author]

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