[Luis Partida]

I think i understand your problem here. One thing to note is RAS Mapper is just a visual tool at the moment with new capabilities continuing to be added one as the software progresses. That being said, if a WSEL is calculated in a 1D element like a storage area, and that WSEL is lower than the terrain elevation, then no depth will be mapped in RAS Mapper however the 1D results will show data there. So basically if the terrain will not allow it to be mapped then that may be your “issue” with visualization.

[Luis Partida]

Its pretty simple, just make sure your 2D extents do not extend beyond the limits of the terrain. you also must make sure the geometry is associated with that terrain.

[Luis Partida]

Here are a few things to check, first make sure you have saved a geometry file even if it is blank, then exit the geometry data editor and within RAS Mapper associate that geometry with the appropriate terrain. Remember RAS Mapper functionality is continuously improving but the old method of creating a new geometry file within the geometry data editor and THEN using RAS Mapper to generate cross sections is always the most sure proof method.

[Luis Partida]

I forgot you could also go to the “View Summary Output by Profile” button, select Options>Define Table. Insert a new column and scroll down to the Volume option. Double click and it will add a Volume entry on your Standard Table-1.

[Luis Partida]

Just do it the old school way in the geometry data editor

[Luis Partida]

Just get this value from your hydrologic calculations/HEC-HMS model as a steady state simulation does not account for attenuation within a cross section

[Luis Partida]

Try adding a min flow (this is diff than an initial flow) to the reach in the unsteady flow editor, if you already have a value input, try increasing it. What is the DS boundary condition for the reach? Upstream BC?

[Luis Partida]

Yes it is HIGHLY recommended, connect the 1d reach to the storage area and connect the 1d storage area to the 2D flow area via a SA/2D conn. Add an initial depth in the unsteady flow data editor for the 1D storage area that will create a realistic starting WSEL

[Luis Partida]

The connection from 1D to the 2D flow area…are you separating them with a 1D storage area? Same with the transition from 2D flow area to 1D geometry downstream?

That alone improves stability greatly

[Luis Partida]

You have a couple options here, you can modify the terrain in RAS 6 versions to represent the flood wall and then extend your cross section to beyond the wall such that your lateral structure is behind it. However, in that scenario you may run into instabilities if the drop from the flood wall to the 2D domain goes into critical depth (likely). The other option is just to represent the flood wall within your lateral structure data weir data.

[Luis Partida]

Hi Stephanie, that is because you have not selected the output options to write and export additional options. In the unsteady state plan editor, go to “output options” and on the last tab you can scroll down and see the additional output write options.

Just remember that RAS 6 offers multiple output options in comparison with RAS 5

[Luis Partida]

You need to learn HEC-MetVue

[Luis Partida]

Yea good point, steady state doesnt need it, ignore that part of the explanation

[Luis Partida]

First off, you may want to use RAS 6.1 as the beta has been outdated.

Flow optimization using lateral structures takes a little more effort, i will try and explain. Your tailwater condition should not be out of system. Instead connect it to a theoretical SA and then turn optimization on. Assuming RAS converges, you must then go into the results file and you will see a reduction in flow rates, you must then create a new flow file with these adjusted flow rates, turn optimization off and then rerun your simulation. Hope this helps

[Luis Partida]

Actually there is a more stable approach to this. I will try and explain but if you want a graphic let me know because i do not know how to upload pics on this new site version.

Main reach will have 2 xs US crossing-1 and 2 xs DS and that reach will continue DS with no break or junction.

Trib Reach will have 2 XS US crossing-2 and ends in a 1D SA.

On the main reach connect the trib SA to the main reach via a lateral structure. This lateral structure will have the crossing -2 culvert data in it.

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