anyone run into this before?
2D model with 1.5 mile wide flat low area with sloughs running rampant and a road through it. Created a S/A connection and added culverts for road going through the low area.
River on one edge of low area.
Upstream boundary hydrograph for 10 year flows.
LIDAR surface. Surveyed roadway and culverts. Created surface from survey using the few shots away from culvert ends to get culverts above LIDAR data.
Culverts closer to river have good flow and expected flow plot. Group of culverts farthest away from river have erratic flow plot. One 96″ has the -901.00.
Maybe I need to create a surface to lower the surface of LIDAR along the flow path leading to these culverts.