Hi,

I am looking into damage to residential property located above the
line of the large underground Water Ring Main that runs around
London.

This was a massive tunneling project that started around 1976 and
carried on for several years thereafter. The tunnel runs for 80Km
around London at a depth of between 30M and 50M. The diameter is 3.2M.
New extensions are currently being added to it.

With any large underground tunnel there is some settlement at ground
level. This gives rise to subsidence which in turn results in cracks
and other damage to property.

As fellow DIYers, I reckon some of you will have encountered such
damage.

I'm trying to get a feel for the scale of the problem in terms of how
many properties were affected and how much the ground settlement was
on average. Also to find out if compensation was paid out by Thames
Water for damage arising.

Thanks in advance.