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From: Vanessa O’Connor
To: “Bora [via HEC-RAS Help]”
Subject: RE: Rasmapper
Thread-Topic: Rasmapper
Thread-Index: AQHTHB8ovUuToo/KCU6gKArE9umWDqKSB3cw
Date: Wed, 23 Aug 2017 14:56:14 +0000
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You need to add levee markers at the top of banks to confine the water to t=
he channel until the banks are overtopped.

From: Bora [via HEC-RAS Help] [mailto:[email protected]]
Sent: August 23, 2017 10:50 AM
To: Vanessa O’Connor
Subject: Rasmapper

Hi,

I ran a model and checked the results on cross section and Rasmapper. I not=
iced anything below water surface elevation is filled with water on Rasmapp=
er even though there is no water crossing the banks. 1d show that the river=
capacity is enough and there is no flood over the banks. However, on rasma=
pper, model result shows water on surface if it is below thalveg.

I dont want Rasmapper to show water on the surface beyond the banks, if wat=
er is not crossing the banks.

How can I overcome this issue on Hecras 5.0.3?

Thank you.
________________________________
If you reply to this email, your message will be added to the discussion be=
low:
http://hec-ras-help.1091112.n5.nabble.com/Rasmapper-tp4420.html
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You=
need to add levee markers at the top of banks to confine the water to the =
channel until the banks are overtopped.

 

<= span lang=3D"EN-CA"> =

 

From: Bora [via HEC-RAS Help] [mailto:ml+=
[email protected]]

Sent: August 23, 2017 10:50 AM
To: Vanessa O’Connor <[email protected]>
Subject: Rasmapper

 

Hi,

I ran a model and checked the results on cross section and Rasmapper. I not=
iced anything below water surface elevation is filled with water on Rasmapp=
er even though there is no water crossing the banks. 1d show that the river=
capacity is enough and there is
no flood over the banks. However, on rasmapper, model result shows water o=
n surface if it is below thalveg.  

I dont want Rasmapper to show water on the surface beyond the banks, if wat=
er is not crossing the banks.

How can I overcome this issue on Hecras 5.0.3?

Thank you.

---

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

http://hec-ras-help.1091112.n5.nabble.=
com/Rasmapper-tp4420.html

To start a=
new topic under HEC-RAS Help, email
ml+s1091112n1h19@=
n5.nabble.com

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

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From: Vanessa O’Connor
To: “kevin [via HEC-RAS Help]”
Subject: Re: Specify geometry for cross sections
Thread-Topic: Specify geometry for cross sections
Thread-Index: AQHStW2x3QZjDM536EGdTQEenrg2oqHF63+A
Date: Fri, 14 Apr 2017 22:43:16 +0000
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[V]

I just checked the Manning’s n table and it does work if I specify just channel, or left and right overbank values.

The computed composite n values look correct to me.

Thanks for your help.

[V]

The bank stations are defined roughly at the 2yr water level, close to the change in slope.

I’ve attached images showing three example sections to compare with the green shaded area identified by RAS as the channel (see first post).

XS 85929 n channel should be 0.035 (no channel n identified)
XS 84072 n channel is identified correctly
XS 82575 n channel should be almost entirely 0.03 (not 0.09)

It appears from the examples above that RAS does not recognize any n values specified before the left bank station.

I think the solution would be to repeat the previous n values at the left bank station locations. Is there an “easy” way to specify the station of new n values? I have hundreds of sections and don’t want to specify them manually in the Cross Section Editor.

From the Bank Station Table, I know where I want to impose new n values (left bank stations) and, if I could get a blank cell to show up at the bank station locations in the Edit Manning’s n Table, I could easily fill in the n values by working in excel. But I can’t think of an “easy” way to specify that I want new n values at the left bank stations so that the blank cells show up in the Edit Manning’s n Table. Any ideas?

I suppose the alternative would be to do the edits in GIS and re-import the n values using GeoRAS.

[V]

[V]

Has anyone added minor losses in HEC-RAS to account for bend losses rather than adjusting the n-values? Are there any references or guidance on how to apply minor losses at large sharp bends?

I know that the losses will be a function of the radius of curvature and the cross section top width. Any additional guidance or ideas would be appreciated.

[Author]

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