Geograph - photograph every grid square

Square manhole in road surface, Westfield

The whole estate has a mixture of round and square manholes. It is tempting to suppose that the square ones are foul water sewers and the round ones surface water drainage. Most of the square ones say "foul" but bits of cast iron are not necessarily good witnesses, and the random building practices of the various contractors cannot be assumed to be consistent. Nevertheless, there are roughly the same number of round and square ones.