Living conditions for slaves in the South

I am doing some writing and need to know about how the sewage of slaves on plantations was handled. I am specifically writing about the 1840s. The main pieces of information I need are about the name (if any) of the area where the slaves relieved themselves and what it actually was. I have been able to find only one reference to this information. That reference simply said that slaves usually went to the woods to do their business. Then the source went on to say that on some plantations, a ditch was dug for the purpose. So, what was the "place" called and what did it look like? I appreciate the help here. I've been looking far and wide for this information. It isn't glamorous, so I think it gets left out for that reason.