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Thank you for the sketch. That helped me better grasp the concept of what is happening with the rendering.
I ended up running the model with about six versions that had slight differences. This ended up being a basic sensitivity study to see what effects changes had on the results. The final version I am going to use for the official report used a computation mesh of 45 feet and 1 second interval. I set only one breakline for the highway and aligned it with the downstream top edge of the structure. This helped to get cells that spanned the top of the road with downstream faces parallel to the structure. See image below. This allowed the inundation/depth values to show up on the road and to not look as irregular at when the cell faces seemed to be stopping the flow in prior models. The various models generally converged with some inundation on that south lane, but did not consistently have more than the 0.5 foot threshold.
With the 50 foot cells, I used 1 second computation interval. Maximum velocity result was under 28 ft/s. Using Full Momentum setting. I get WSEL errors on nearly every model.
I looked along the south lane of the road in the current results from using dual breaklines. Flipping between the horizontal and hybrid render modes does not show discernible differences. Inundation still is “stopped” exactly at the cell faces near the road centerline. New depths in that south lane are less than 1 foot.
The terrain shows the road well since it is elevated.
