I thought the answer was Paul_P
(
PedroHin Come along & ride on a Flantastic Voyage,
Sun 26 May 2013, 18:27,
archived)
^ this
is the correct answer
(
Dick Wonder ₐ wₒₙₖy, wₐᵥy wₒₙdₑᵣ,
Sun 26 May 2013, 18:33,
archived)
I actually know which sewer this is :D
It's not this one but the photo is related as a sewer outflows into this drain

(
Paul_P http://www.Paul-hub.com,
Sun 26 May 2013, 20:44,
archived)