My semi-detached house is on a shared water supply with the neighbour and to fix the leaking stopcock on my side I dug part of it up and at the same time figured out the route it takes to next door. It's a lead pipe and a metre deep as you'd expect. It runs about 8m from the road and T's off to my kitchen then continues along the side of the house, turns the corner and runs across the back of the house before doubling back to the neighbour's kitchen. In all it's another 15m from my kitchen to theirs. About half a metre down you hit solid blue clay which is difficult to dig even with a pickaxe and a spade wont go through it. My question is why did the builders (in 1929) do this and use more pipe and labour than necessary? Why not lay two short individual supply pipes on separate connections? Or why not T it off in the front garden instead of doubling back around the side of the house? I haven't been able to find any answers on this and it has been bugging me because I'm sure builders tried to keep costs down even in those days. Just hoping some people with building/plumbing experience might know.