Oliver
This is what I did in my garage, before pouring my slab I
bought a "septic tank riser". This is a cylinder approx.
24" in dia. x 36" high used to extend your access to a septic tank. or "Murf's barrel". I prefered the concrete
because of it's two in. thickness to support the cover
and it's compatible with the cement floor holding it in.
Dug a hole for it and set it 2" below grade for drainage.
I put my exit pipe about 6" down from the TOP as to create
a sand trap,"winter road sand on tires" for all you flatlanders. When I poured my floor I put some in the bottom
and finished the floor up to the edge.Had a 3/8 steel plate
cut and drilled,3/4 in. holes for "kids fingers" and heavy
enough so they can't lift it.
In the winter I dump a gallon of RV non-toxic anti-freeze
in to keep it from freezing.
As far as a pit outside,I just let it go on top of the
ground where it exits the grade away from the house.
If you had a lot of water, I would dig a "dry well"
An open pit filled with rocks. This would really depend on your site?

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