In reply to Rene'.

I talked about it about halfway down the post, but I will clarify. If it's the basic Sanitary Latrine type, they just pick up the outhouse and move it to a new pit and and fill in the old pit. But the better "LASF" type makes fertilizer. It has two compartments, and when one fills up (every 6-9 months), you seal it and move the toilet seat to the other one. When THAT one fills up half a year later, you empty the first one (which is now full of fertilizer, after months of composting action) from a little door in the back, move the seat back on top, and seal the chamber that you just filled up. In that manner, you can use the latrine indefinitely.