[fennecfoxen]

I was under the impression that in places like Amsterdam, canals were useful historically because people didn't have motor vehicles so they were a highly effective way to move goods around town (and to/from remote farms, towns and cities via rivers like the Amstel and IJ, other canals, and the sea).

Today, while extant networks may remain quite decorative and interesting, urban canals seem unlikely to be used for any purpose other than high-end recreation / tourism, and the article does not address any way they'd be directly useful for flood control. It's not even made clear they'd really assist in keeping seawater out of peoples' homes and businesses.

[vonmoltke]

I was under the impression that the canal networks in the Netherlands were similar to the South Florida Water Management District's canal system. The primary purpose of the network is to prevent southern Florida from reverting to swampland, which is the natural tendency due to the geology, geography, and weather patterns. Since much of the coastal Netherlands is in a similar situation, I always assumed the canals were primarily for moving water to the North Sea without flooding out the low-lying areas.

[fennecfoxen]

That may be the case for de kanalen, but I don't think it explains de grachten -- that is, the Netherlands has canals criss-crossing the countryside which might accomplish flood control purposes, but when there are canals in between every other city street, that's another matter.

Either way, the article failed to explain :)

(Fun fact: the word "gracht", Dutch / Nederlands for street-canal, uses the voiced velar fricative, a sound which English eschews. Good luck pronouncing it right. :b)