AutoCAD Civil 3D - Stormwater

[#1]

In a run of pipes and structures, I have 3 structures that overflow.  2 of the structures max hgl els are even with the rim elevation (as is in the case of other runs in the same project), and 1 structure has the max hgl exceeding the elev of the rim.  Why this one and not the others?

[#2]

Check the structure settings for each. The one with the HGL exceeding the structure may be in sag and have a inlet ponding enabled. The others may be 'on grade' with no storage, and the overflow is simply lost unless you have a by-pass target set-up.

[#3]

Yea, I thought I checked that yesterday but will check it again today.  I was quite frustrated yesterday trying to figure a way to build an object to represent the surface contours.