I'm drawing existing SD pipes and trying to put in rim and inverts of the existing structures. Sometimes it won't let me raise an invert to where it really is. It only let's me raise it so far. It may be a rule but it doesn't seem to be a rule I can change. What can I do?
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The issue could be that whatever part you are using won't work in your situation, and you need to select a different part. For example, a typical manhole with a cone section can only be used to a point, at which point you need to switch to a flat-top. Perhaps the part you are using has a restriction that is affecting the invert?
At first I found this an annoyance, but this is actually good to keep pople cognizant of what is going on. We ended up creating three types of junction parts - those with riser cones (which work when pipe cover is >4') those with cones for an expansion to oversize pipes, those with a slab top (for minimum cover pipes) and those with a slab for the expansion (oversize pipes with little cover). Think about it - you can't (shouldn't) be putting a pipe into the conical section, so when you use this kind of part, it will create limitations.
Fact is, we usually have not had to consider this - we just spec the standard. When working in a congested area, if you go through the steps above it can help you model what structure you need for each situation and verify you have clearance, but if all you need is a structure to spec, constraints are not that tight for the work you do, go for the less intuitive slab cylindrical or square top structure instead of the cone, and you can get down to minimum cover just below the ground.