Ummm, its pretty dead, your best chance is to check with your town hall to see if they'll let you look at maps, or to just walk along streams and rivers. If you mean just for info, these sites are pretty good:
http://www.infiltration.org/observations-drains.html
http://www.webring.org/l/rd?ring=draining;id=8;url=http%3A%2F%2Fnostalgia%2Euer%2Eca%2Fuec%2F_uec%2Fdrains%2Ehtml
http://sleepycity.net/approach-to-draining
EDIT: Are you guys interested in this enough to warrant a new community thread?
EDIT2: Just found another great link. Added