2017 Structure Properties-Insertion Rim behavior

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Sounds like you may have a structure rim to connected pipe
vertical distance limit issue.

Structures will try to accommodate a connected pipe by adding
the pipe invert, pipe diameter, pipe wall thickness, structure
top slab or cone, grate/rim frame thickness, plus a vertical
pipe clearance value. If there isn’t enough distance from
invert to rim, the rim adjusts to the minimum allowable.

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