[Jake G]

Colin,

The main issue is usually the inside of a sharp bend. Here’s an example of a cross section layout in that case.

I wouldn’t recommend making the XS Cut Lines smaller in length than the actual cross section because by georeferencing you’re trying to get the cross sections as close to their actual location as possible, including their extents.

Since this was originally a FEMA model, there will likely be lettered cross sections on the Flood Insurance Rate Map that you can use to georeferenced some of the cross sections. You should also use the overbank downstream reach lengths from the model.

Hope this helps!

– Jake G.

[Jake G]

Hi Colin,

I took a look at the geometry for Plan 02 and there are a number of intersecting cross sections. If you adjust the georeferencing so that the intersections are eliminated, it should get rid of the error HEC-RAS is giving when trying to generate the XS interpolation surface.

– Jake G.

[Jake G]

If you didn’t already try it, the HEC website describes a known issue with DSSVue and a workaround:

When HEC-DSS Vue starts, it asks Java to allocate system memory for it to work within. Lately, some virus checkers pushed out an update that limited the memory foot print of programs. On some systems, this change did not allow Java to allocate the requested memory and it failed loading HEC-DSSVue.

To resolve this, HEC-DSSVue can have its maximum memory lowered. It should work fine, unless you have very large datasets. In the install directory, edit the file HEC-DSSVue.config and change

      #:——————————————————:
      #: Memory parameters :
      #:——————————————————:
      vmparam -ms64M -mx1000M

   to

      #:——————————————————:
      #: Memory parameters :
      #:——————————————————:
      vmparam -ms12M -mx600M

   Save and restart HEC-DSSVue.

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