However, no flow was being put in between the cross sections upstream and downstream of a bridge/culvert or an inline structure. The flow is then put in between the cross sections based on the flow per foot computed, times the length between the cross sections. The bug was caused due to HEC-RAS not using the length across the bridge/culvert or inline structure to compute the total lateral structure length, which is then used in computing the flow per foot along the lateral structure.
When using a uniform lateral inflow along a 1D river reach, HEC-RAS was not correctly putting all of the flow into the river from the uniform lateral inflow hydrograph when the lateral inflow extended across a bridge/culvert or an inline structure. Users can draw these polygons in any direction. This problem has been fixed in version 5.0.7. Because the polygon had a negative area, the polygon was actually not being used to override any of the Manning’s n values. Unfortunately, in previous versions of HEC-RAS Geometry editor (5.0.6 and earlier), if you draw a Manning’s n Region polygon in the counter clockwise direction, a negative area was computed for the polygon (the shapefile standard is to store it in the clockwise direction). If you used the Manning’s n Region option in the RAS Geometry editor (Not RAS Mapper), there may be an issue with your final Manning’s n values not being correct within that Region.
The following is a list of bugs that were found in HEC-RAS Version 5.0.6 and fixed for Version 5.0.7:
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