User blog comment:Stormwell/Dunwall Locations/@comment-217.122.254.24-20140118164044/@comment-1500935-20140119112031

I think it was indeed mentioned by Abigail Ames that the pipes were connected to the Greaves refinery (when shes asks you to sabotage the slaughterhouse) or elsewhere, better check for that.

About Slaughterhouse Row, I'd see it located at the mouth of the Wrenhaven River (probably where the Old Port District is) so whaling trawlers can easily access it. However there are whaling trawlers going up the river as far as the Legal District so I really doubt about its location in Dunwall.