Susan,

All of the previous posts were spot-on, but your friend should consult an attorney to see what the law is in her state/locality (i.e. regarding wells, easements, and riparian rights). She definitely should NOT agree to anything until or unless she has a good idea of what potential long-term consequences there are for her, because she will be the one holding the bag. Of course, this assumes that she's game after fully understanding what rights she would have, and what rights she would not have.