Ground water management of building sites.
When the wall went down and the city was reunited, there was an urgent need to transport vast amounts of clean and foul water as well as gas and electricity (?) throughout the whole city so there was a massive network of these pipes above ground, this being the quickest wy of getting things going. Most are now underground, but there are still quite a few to be seen (as you have done :). The colours indicate what the pipes are carrying.Edited: 12 April 2012, 16:51
Brilliant, thank you both so much!
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