[grahamm]

In the southeast of England where would this storage reservoir be?

[DrBazza]

It’s been over 50 years and we still haven’t built the only proposed reservoir in Kent at Broad Oak near Canterbury. We are useless at getting things done in the uk. That a third Blackwell Tunnel is being built is incredible.

[londons_explore]

It's raw sewage, so probably not on the surface.

You'd dig up a few acres of park and put it underneath.