Personally I'm glad this thread is still active. I gives folks something to consider as they look for making maps more realistic and by extension their games. Not that I would want to roleplay the use of said facilities, but they could be an important plot point or similar.

In fact, we used a "chute" to enter a border fort in a game once. I won't go into detail, but it was quite memorable and the lengths we went through to keep from getting "soiled" were quite humorous.