Silence . Large crack as man opens can of beer . Rustling of paper as four judges hold up their score cards . Moan of disapproval when they see Ricardo holding up a 6 . What does it take to impress this guy ? <| sep |> 1 . Water Mill can only be built in a city on a river . Huey Teocalli is the only thing I can think of that needs a lake , but your city doesn ' t need to be on the lake . You get a boost to Sailing for settling a city on a coast . I can ' t think of anything else other than being closer to some resource . Housing is a big deal though . 2 . Not that I ' ve seen . 3 . Yields under your districts are lost . But if you discover a resource later in the game niter , oil , uranium , etc . and it ' s under your district you get that resource . 4 . Yes , adjacency bonuses are updated after you build more districts , wonders , mines , plant forests , etc . You can ' t see them though . 5 . Campus , harbor , holy site , industrial zone , and theater square get adjacency bonuses for every 2 adjacent districts . All districts count , including neighborhoods and the city center . Unique districts have their special rules , so you ' ll need to read about them on the civilopedia .