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  1. Good morning, Does anyone know how SRH-2D monitor lines work. I am wondering how they calculate the average water surface elevation? Is a straight average or flow weighted somehow? Also how is the flowrate calculated? I find they never match flux calculated with an identical observation line. Thanks, Phillip
  2. I wonder if you're getting a spike in water surface at the boundary line with a depth of 100 to 1,000 feet right on the culvert. Decrease the time step could help
  3. Traggatmot, Looks good. Plenty of cells along the culvert Have you tried shrinking the boundary to not include that cell? May not be a permanent solution, but could make run. Phillip
  4. Hi, I have a LIDAR DEM file (in ACSII Grid format loaded as a GIS object) that I am using to pull elevation for my mesh and cross sections. The vertical projection is NAVD88 US Survey Feet. However, every time I reopen my SMS file the units reset to meters. Chaning the project from local to NAVD88 and saving the SMS file does not help. Does anyone know a way to get the vertical project to be saved in GIS data? Thanks, Phillip
  5. Do your culvert boundary arcs line up well with cell edges in your mesh? I have gotten similar errors before and that is the first thing I would check. Phillip
  6. Is there an easy way to relate monitor line output file names to the monitor line ID in SMS? My monitors line have ID's from 17 to 26, but the out files are ...LN1.dat to ...LN8.dat? Thanks, Phillip
  7. Anything on overtopping the deck is model as 1D flow between the end boundaries. I think I am thinking of a 3D situation with flows going two different directions on top of each other. I am going to use the links as you suggested. They should be good enough for this model. Thanks for you help Phillip
  8. Do the elements in the 2D pressure flow area represent the channel under the bridge or the bridge deck?
  9. Thanks you for the reply. 2D pressure flow areas would have the same problem as 1D culverts, right? Phillip
  10. Hi, I am modeling flooding along a stream that enters a long culvert under a parking lot in SRH-2D. During high flows the culvert overtops and pools in the parking lot before draining off in a different direction. The problem is that the 1D overtopping flow of the culvert acts like a wall through the parking lot. The water that overtops to the left side of the culvert is blocked by the 1D section from reaching the outlet and just pools and swirls. The blockage raises the water surface on that side of the culvert about a tenth of foot above the other side. Any thoughts on how to model properly. I have tired both HY-8 and the SRH-2D internal culvert routines, but they both have 1D flow along the top. I am using SMS 12.3.3 Thanks, Phillip
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