[mowens]

Thanks! That helps a lot!
I have a follow up about 2D connections:

When I run the model and look at my stage/flow hydrographs for any connections that are overtopping or about to overtop, my output looks like a little strange. The HW and TW Stage keep increasing but the the total flow and the culvert flow decrease. This doesn’t make sense to me that I would see a decrease in flow.

I have run the model with Inlet control, outlet control, smaller time steps, adjusted the mesh so the cells are bigger, changed the overflow computation method from from weir equation to normal 2D equation and none of those options have changed hydrograph and decreasing flow through the culvert during the storm event. I also tried running as DW and FM and changing the weir flow submergence decay exponent.

I have run the same culvert in a test 1D model using the same HW/TW elevation relationship and when I look at the 1D model my culverts can handle much more flow based on the WSEs.

I am not sure why the 2D model is doing this but maybe you have some insight as to why this is happening.

2D

[mowens]

Try going into the geometry Editor –> Tables –> manning n values by land cover and inputting the values there instead.

I never had any luck with saving manning n override values in RASMapper.

[mowens]

I’m also having this issue. Has a solution been found?

[mowens]

Hi …

I am also experienced this issue. I have also tried to do this with WSE instead of depth at a certain value. I get as far as “Processing Terrain Stitch TIN” but I never get a shapefile out of this process.

Have tried a few times now… Did you manage to figure this out?

[mowens]

Hi did you manage to figure this out?

[Author]

Posts