I thought about this more and I don't like it leaving a ramp.
The whole purpose of channeling was to make a pit (ie a channel), if i wanted to leave ramps and dig into the earth that way i would dig using ramps (if you don't know this, this is the quickest way to dig in 40d as you don't need to line out channels one at a time in an enclosed space).
Now If i can get rid of the ramps with out having to go down into the channel then it is not a big deal, otherwise it just totally kills a main defense which is pit moats.
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