Urban water, sewage, and hydrology

http://www.berlinglobal.org/index.php?the-berlin-mystery-of-the-pink-pipes

http://edition.cnn.com/2012/10/31/world/asia/japan-flood-tunnel/

http://www.telegraph.co.uk/travel/destinations/europe/uk/london/9197314/Londons-lost-rivers-the-hidden-history-of-the-citys-buried-waterways.html

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