Roger Hunt writes
'Mike' wrote

wrote in message
groups.com...
A neighbour recently told me that she could hear an underground stream
flowing beneath her garden, and suggested maybe it flowed across mine
too. Then someone sent me an old map of the West Hampstead area in
London which shows an underground stream passing more or less along
the boundary between the bottom of my garden, and the field next
door. If the stream lies on my side of the boundary and isn't too
deep, it might be nice to uncover it and create a natural pool. I'll
need some kind of survey to pinpoint it, of course - has anyone got
any experience with reliable people/companies who do this kind of
thing ?

Your 'stream' may already be curvetted and in a huge concrete tube :-((

I worked for a builder in Leicester in the 60's and this is what they did
before building an estate :-((

That's what largely happened to the river Fleet isn't it?

It does sound likely that it's culverted. Streams don't go underground
of their own accord except in limestone country.
--
Kay