The point isn't really about water boundaries, it's a larger about boundaries in general. Zip code isn't a good mapping to anything except how your mail is deli

The point isn't really about water boundaries, it's a larger about boundaries in general. Zip code isn't a good mapping to anything except how your mail is delivered. The water system was just a very good example of how using zip to do these mappings can fail catastrophically. This is a piece about GIS, not the particular data involved in telling it.