Extracting River station and water levels in any/MATLAB environment

[anandtkulkarni]

Hi Chris,
Posting first message of 2018!

I have simple HEC-RAS model of river1 and reach1 with 4 station points viz: 3000m, 2000m, 1000m and 0m.

I am able to compute the water levels and save the project using RAS Controller. However I am struggling to extract the resulting water levels out of it.

How could one possibly possibly extract water levels to a .txt or .csv file

Having tried couple of method I am inclined to think that calling following function should help
Output_ComputationLevel_Export(ByRef filename As String, ByRef errmsg As String, Optional ByRef WriteFlow As Boolean = Nothing, Optional ByRef WriteStage As Boolean = Nothing, Optional ByRef WriteArea As Boolean = Nothing, Optional ByRef WriteTopWidth As Boolean = Nothing) As Object

few clarifications – what would be the output file name? prj file or somting else?

if not above function then is it
OutputDSS_GetStageFlow(ByRef river As String, ByRef reach As String, ByRef rs As String, ByRef nvalue As Integer, ByRef ValueDateTime As System.Array, ByRef Stage As System.Array, ByRef Flow As System.Array, ByRef errmsg As String) As Boolean

i know river is ‘river1’, reach is ‘reach1’ and rs can be say ‘3000’. Others I am not sure how to populate.

Chris, thanks for writing the book, I have ordered it online and is under shipping. I am informed it may take one more week of so.

Thanks,

Regards,
Anand K

[Chris G.]

Hi Anand-

I suggest using OutputDSS_GetStageFlow to get water surface elevations. Appendix A of “Breaking the HEC-RAS Code” clearly explains the arguments that go with that Function. Good luck!

Chris

[Anonymous]

Hi Anand,

Could you find the answer to your question? I have the same problem.

Thanks,
Zara

[anandtkulkarni]

Oh yes getting water levels from MATLAB is not that hard

h=actxserver(‘RAS501.HECRASCONTROLLER’);
h.Output_NodeOutput(riverID,reachID,nodeIDs,updn,profile,nVar);

With appropriate ‘nVar’ value one could get the desired output. The book “Breaking HEC-RAS Code” has good details about them . Say for example you can get Water Surface Elevation if you use nVar=2 and so on for others.

Hope this helps!

Regards,
Anand K

[sajna94]

hi,
what is this nvar in water surface extraction means?

[anandtkulkarni]

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References: <[email protected]> <[email protected]>
<[email protected]> <[email protected]>
In-Reply-To: <[email protected]>
From: Anand Kulkarni
Date: Wed, 19 Jun 2019 12:51:24 +0530
Message-ID:
Subject: Re: Extracting River station and water levels in any/MATLAB environment
To: “sajna [via HEC-RAS Help]”
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Nvar is the specific variable that needs to be used to extract water
levels. There are different nvar values to extract different variables say
for water depth, discharge etc….
The different nvar values have been specified in the appendix of breaking
hecras code book if you have.

Thanks
Regards
Anand Kulkarni

Anandtkulkarni

On Wed 19 Jun, 2019 11:17 am sajna [via HEC-RAS Help], < [email protected]> wrote:

> hi,
> what is this nvar in water surface extraction means?
>
>
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–0000000000006abc0d058ba81483
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Nvar is the specific variable that needs to be used to ex=
tract water levels. There are different nvar values to extract different va=
riables say for water depth, discharge etc….

The differe=
nt nvar values have been specified in the appendix of breaking hecras code =
book if you have.

Thanks=

Regards

Anand Kulkarni

Anandtkulkarni

=

On Wed 19 Jun, =
2019 11:17 am sajna [via HEC-RAS Help], <[email protected]> wrote:
<= /div>

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

hi,

what is this nvar in water surface extraction means?

=09
=09
=09

---

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

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[sajna94]

Thank you for your kind replay.

but i am still not getting to extract the water surface level from Hec ras. Can you please help me.
if you dont mind can you send the code for that.

Thanking you,
sajna

[Author]

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