[Chris G.]

The Muncie and Bald Eagle Creek data sets has both 1D and 2D in them and they plot velocity fine. I’ve not tried plotting velocity in RAS Mapper with only 1D yet. Perhaps you could create a dummy 2D area off on the side with its own boundary conditions and see if it works. Just a thought. Please let us know if you figure it out.

Thanks-
Chris

[Chris G.]

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Subject: Re: Editing Manning Coefficient for All Cross-Sections
References: <[email protected]>
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Go to the tables menu item in the geometry window. There you’ll see a table o=
f all n values that you can quickly edit.=20

Sent from my iPhone

> On Dec 4, 2014, at 11:54 AM, Vicky [via HEC-RAS Help] wrote:
>=20
> Hello,=20
>=20
> I am fairly new to HEC-RAS software and was wondering if there is a quick w=
ay to change all the manning’s coefficients for all of my cross sections. I l=
ooked into changing it manually through the .g file in the project folder, b=
ut seems time consuming. I appreciate all the help!=20
>=20
> Thank you,=20
>=20
> Vicky=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/Editing-Manning-Coefficient-for-=
All-Cross-Sections-tp1146.html
> To unsubscribe from HEC-RAS Help, click here.
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Go to the tables menu item in the geometry window. There you’ll see a table of all n values that you can quickly edit. 

Sent from my iPhone

On Dec 4, 2014, at 11:54 AM, Vicky [via HEC-RAS Help] <[email protected]> wrote:

Hello,

I am fairly new to HEC-RAS software and was wondering if there is a quick way to change all the manning’s coefficients for all of my cross sections. I looked into changing it manually through the .g file in the project folder, but seems time consuming. I appreciate all the help!

Thank you,

Vicky

---

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[Chris G.]

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Subject: Re: Performing sediment transport analysis
References: <[email protected]>
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There have been some bugs with SI units with sediment in the past. Hopefully=
they have been cleared up for version 5.0. I’d try it in 5.0, just be caref=
ul. Yes, you can convert from SI to US Customary. It’s in the Options menu i=
tem in the main RAS window.=20

Sent from my iPhone

> On Nov 6, 2014, at 10:17 PM, Micah [via HEC-RAS Help] wrote:
>=20
> Hi,=20
>=20
> I would just like to ask if it is okay to use both SI units and the Englis=
h system for performing sediment analysis. I’m just new to HEC-RAS and my bo=
ss kept on telling me that I can’t use the SI units if I would like to perfo=
rm sediment analysis.=20
>=20
> Or is there a way to convert the geometric data from meters to feet?=20
>=20
> Please help me out! =E3=85=9C=E3=85=9C=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/Performing-sediment-transport-an=
alysis-tp1078.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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There have been some bugs with SI unit=
s with sediment in the past. Hopefully they have been cleared up for version=
5.0. I’d try it in 5.0, just be careful. Yes, you can convert from SI to US=
Customary. It’s in the Options menu item in the main RAS window. 
<= br>Sent from my iPhone

On Nov 6, 2014, at 10:17 PM, Micah [via=
HEC-RAS Help] <=
[email protected]> wrote:

Hi,

I would just like to ask if it is okay to use both SI units and the E=
nglish system for performing sediment analysis. I’m just new to HEC-RAS and m=
y boss kept on telling me that I can’t use the SI units if I would like to p=
erform sediment analysis.

Or is there a way to convert the geometric data from meters to feet?=

Please help me out! =E3=85=9C=E3=85=9C

=09
=09
=09

---

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=09
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=

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[Chris G.]

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Subject: Re: HEC-RAS Autobackup Behavior
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Probably not.=20

Sent from my iPhone

> On Nov 4, 2014, at 10:47 AM, huesmann [via HEC-RAS Help] wrote:
>=20
> So at least for me, when HEC-RAS does an autobackup, it changes the progra=
m’s priority in the running programs to #2, below whatever program I have ac=
tive at the time. For example, say I have HEC-RAS, Excel and Word open on m=
y computer. I’m twiddling around in Excel, I switch to Word using Alt-Tab, t=
hen back to Excel. HEC-RAS should be #3 on the list, but then it does an au=
tobackup. On my next Alt-Tab, instead of going from Excel back to Word, it n=
ow goes to HEC-RAS.=20
>=20
> Is there any way to change this hijacking behavior, other than turning Aut=
obackup off?=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/HEC-RAS-Autobackup-Behavior-tp10=
74.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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Probably not. 

Sent from my iPhone

On Nov 4, 2014, at 10:47 AM, huesmann [via HEC-RAS Help] <[email protected]> wrote:

So at least for me, when HEC-RAS does an autobackup, it changes the program’s priority in the running programs to #2, below whatever program I have active at the time.  For example, say I have HEC-RAS, Excel and Word open on my computer.  I’m twiddling around in Excel, I switch to Word using Alt-Tab, then back to Excel.  HEC-RAS should be #3 on the list, but then it does an autobackup.  On my next Alt-Tab, instead of going from Excel back to Word, it now goes to HEC-RAS.

Is there any way to change this hijacking behavior, other than turning Autobackup off?

---

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[Chris G.]

(1) In the pier data editor, are ‘centerline station upstream’ = AB, ‘centerline station downstream’=DC? Yes.

(2) In the deck/roadway data editor, should I set ‘distance’ = BE or AH? Is ‘width’=EF or GH? I usually use EF, but it shouldn’t make much difference for a typical bridge.

(3) If I set up ‘Deck roadway and abutment skew angle’=Θ, I noticed that the pier looks narrower in the bridge culvert editor. Not sure why this is. Maybe the scale on the plot changed with the skewing of the deck and abutments?

Suppose my pier width=x ft, is the pier width I see in the bridge culvert editor the equivalent pier width, x*cos Θ? Yes, I believe so.

If I set bridge ‘width’=EF, does HEC-RAS actually using EF*cos Θ as equivalent bridge width? I do not think so.

[Chris G.]

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Subject: Re: Dam break routing
References: <[email protected]>
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Yes, especially if it’s a fairly confined reach(ie like a canyon).=20

Sent from my iPhone

> 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:
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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!

---

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[Chris G.]

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You can use open source free GIS software. We use Quantum GIS.=20

Sent from my iPhone

> On Oct 3, 2014, at 8:01 AM, “MichaelG [via HEC-RAS Help]” wrote:
>=20
> The HEC-RAS 2D is a major advance in modeling. Here is my question: I have=
terrain data in x,y,z format and do not have access to the ESRI software (A=
rcGIS). How do I build an input file for RASMapper from this data?=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/RAS-2D-tp1015.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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You can use open source free GIS software. We use Quantum GIS. 

Sent from my iPhone

On Oct 3, 2014, at 8:01 AM, “MichaelG [via HEC-RAS Help]” <[email protected]> wrote:

The HEC-RAS 2D is a major advance in modeling. Here is my question: I have terrain data in x,y,z format and do not have access to the ESRI software (ArcGIS).  How do I build an input file for RASMapper from this data?

---

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NAML

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[Chris G.]

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Subject: Re: Flexible Mesh vs Rectangular Grid
References: <[email protected]>
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It depends on the model and how it solves the equations. In RAS 2D, a rectan=
gular works fine, as does unstructured. =46rom what I understand, flexible h=
as no advantage in RAS.=20

Sent from my iPhone

> On Sep 22, 2014, at 3:38 PM, “Mike [via HEC-RAS Help]” wrote:
>=20
> I have a general Question, I appreciate that if someone can answer to my Q=
uestion.=20
> what is the difference between flexible Mesh and Rectangular grids? when s=
hould we use Flexible Mesh rather than Rectangular grids?=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/Flexible-Mesh-vs-Rectangular-Gri=
d-tp990.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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It depends on the model and how it solves the equations. In RAS 2D, a rectangular works fine, as does unstructured. From what I understand, flexible has no advantage in RAS. 

Sent from my iPhone

On Sep 22, 2014, at 3:38 PM, “Mike [via HEC-RAS Help]” <[email protected]> wrote:

I have a general Question, I appreciate that if someone can answer to my Question.

what is the difference between flexible Mesh and Rectangular grids? when should we use Flexible Mesh rather than Rectangular grids?

---

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NAML

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[Chris G.]

For now, you’re options are very limited. There is the HDF Viewer, which will allow you to see much of your 2D area output in tabular form. It’s pretty raw for this current beta version of RAS, but with some detective work and some Excel/Macro wizardry, you might be able to figure it out somehow. If you do, please email me how you did it, so I can share with the blogosphere. You can read up on the HDF viewer, including how to download it (for free) in the current 2D User’s Manual located here: https://drive.google.com/file/d/0B_s8OLJOgOi0Nm5sdHFhSzFUYkk/edit?usp=sharing

[Chris G.]

There is a known bug in version 5.0 beta that is preventing shapefiles from being created (even though it looks like it should be done). Keep an eye out for the official release of Version 5.0 where this should be fixed.

[Chris G.]

Make sure you are looking at the cross section plot (main RAS window, View…Cross Sections…). Then go to Options…Variables, and check the variables you wish to see.

[Chris G.]

Todd, if you are getting a stair-step effect with 1-ft LiDAR, I would guess your cross sections are spaced very close together, or you have a very shallow sloped system (just a guess). If that is the case, you could extract cross sections at a coarser interval and then let HEC-RAS interpolate to your desired spacing.

If you’re still having a stair step issue after interpolation, the following post may provide some insight: http://hecrasmodel.blogspot.com/2008/12/extra-precision-in-interpolated-cross.html
Good luck-
Chris
@RASModel

[Chris G.]

Roger-

I think a cross section lid is a good way to simulate the effects of the deck. You could also try using a bridge, which would allow you to add in deck piers (if you have them) but make sure you use the energy equation for your high flow modeling approach. Either method (lids or bridge with energy method) should give similar results. The best way to gage the effect is to see what kind of rise in water surface elevation you get just upstream of the deck for both existing and proposed conditions. Good Luck.
Chris
@RASModel

[Chris G.]

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Subject: Re: GeoHECRAS River Analysis Software-Reviewes
References: <[email protected]>
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This is the first I’ve heard of it. If it is as good as they make it sound, i=
t might be worth checking out.=20

Sent from my iPhone

> On Sep 9, 2014, at 9:58 AM, “Jose A. [via HEC-RAS Help]” wrote:
>=20
> Hi,=20
>=20
> I was recently contacted by this company to introduce me to their software=
GEOHECRAS. Has any of you have work with this software?? I just want some i=
nput before I give it a try. (http://www.civilgeo.com/geo-hec-ras/)=20
>=20
> Thanks,=20
>=20
> Jose=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/GeoHECRAS-River-Analysis-Softwar=
e-Reviewes-tp936.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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This is the first I’ve heard of it. If it is as good as they make it sound, it might be worth checking out. 

Sent from my iPhone

On Sep 9, 2014, at 9:58 AM, “Jose A. [via HEC-RAS Help]” <[email protected]> wrote:

Hi,

I was recently contacted by this company to introduce me to their software GEOHECRAS.  Has any of you have work with this software?? I just want some input before I give it a try.  (http://www.civilgeo.com/geo-hec-ras/)

Thanks,

Jose

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NAML

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[Chris G.]

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Subject: Re: model of small laboratory flume
References: <[email protected]>
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Hi Jason-

Try this: http://hecrasmodel.blogspot.com/2008/12/extra-precision-in-interp=
olated-cross.html

Let me know if it works.=20
Chris

Sent from my iPhone

> On Sep 4, 2014, at 9:24 AM, “Jason Hill [via HEC-RAS Help]” wrote:
>=20
> I teach a basic hydraulics course and would like to use RAS to model diffe=
rent flow scenarios in the small flume (width =3D100 mm, length =3D 4 meter,=
height =3D 300 mm). I have had some success with steep slope models (4% or=
greater, even including hydraulic jumps). The students collect flume data a=
nd add to the model for calibration. I would like to model mild slope scena=
rios with bridge piers inserted into the flume. I created a cross section a=
t station 0 and copied it to station 4 with a downstream reach length of 4 m=
and adjusted the elevations for a slope of 0.5%. When using the interpolat=
ion feature to add additional cross sections, oscillations in the bed are sh=
own due to the very small elevation changes and presumably storage limitatio=
ns. Anyone have suggestions to get around this? Thanks!=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/model-of-small-laboratory-flume-=
tp927.html
> To unsubscribe from HEC-RAS Help, click here.
> NAML

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Hi Jason-

Try this:  http://hecrasmodel.blogspot.com/2008/12/extra-precision-in-interpolated-cross.html

Let me know if it works. 

Chris

Sent from my iPhone

On Sep 4, 2014, at 9:24 AM, “Jason Hill [via HEC-RAS Help]” <[email protected]> wrote:

I teach a basic hydraulics course and would like to use RAS to model different flow scenarios in the small flume (width =100 mm, length = 4 meter, height = 300 mm).  I have had some success with steep slope models (4% or greater, even including hydraulic jumps).  The students collect flume data and add to the model for calibration.  I would like to model mild slope scenarios with bridge piers inserted into the flume.  I created a cross section at station 0 and copied it to station 4 with a downstream reach length of 4 m and adjusted the elevations for a slope of 0.5%.  When using the interpolation feature to add additional cross sections, oscillations in the bed are shown due to the very small elevation changes and presumably storage limitations.  Anyone have suggestions to get around this?  Thanks!

---

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NAML

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