[Chris Goodell]

There’s no “permeability” attribute for lateral structures in RAS. If you can estimate what the leaked flow is, then you can enter that as a time series of flows for the lateral structure though.

[Chris Goodell]

Consider using Reference Points. You may have to operate the gates using Rules though.

[Chris Goodell]

The only thing I can think of is to check your layer (image) display properties and make sure the color ramp values are correct (especially the min and max).

[Chris Goodell]

For now, I believe you have the best way to do this is to use an external GIS like ArcGIS or QGIS. There you’ll find tools that can quickly trim multiple polylines based on an overlapping polygon, or line. I just don’t think RAS has brought those tools into RAS Mapper yet (I could be wrong…6.0 is pretty new, so if anyone knows how to do this in RAS Mapper, please comment…)

[Chris Goodell]

Not sure if this is what you’re describing, but sounds like you have some leaking. Putting in breaklines on high ground can prevent this. But in general, yeah, particle tracing is a graphical representation of the computed flow directions. It doesn’t always work perfectly for every situation.

[Chris Goodell]

Looks like you’re modeling a tunnel with your lids. Make sure that the top of the lids are high enough that water can’t get above them (i.e. higher than the hydraulic grade line). Looks like that might be what’s going on here.

[Chris Goodell]

Personally, I use the average bottom elevation. But a lot will really depend on how it’s surveyed. The detail that you pick up in your survey really depends on your study objectives and at what scale you are focusing on. Near-field, localized conditions may require you to pick up a lot more detail on the bed. A reach-wide flood study: you don’t really need that kind of detail. Go with an average bed elevation and adjust the Manning’s n value to represent the type of bed material you have.

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