"Basil Jet" wrote in message
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http://maps.google.co.uk/maps?hl=en&...03433&t=h&z=19

Salmons Brook and Pymmes Brook both have dividing walls in their centre.
The walls end where the two brooks meet and then a new dividing wall
starts after the junction. Why is this?

Maybe the walls were built to provide support for a cover that was either
never built, or subsequently removed?

If you track the combined brook southwards, it nearly meet the Lea at
Stonebridge Locks, but has its own channel alongside it to just past
Tottenham Locks. Why is the brook deliberately kept apart from the Lea
Navigation?


The plumbing in this area is very complicated; you can get an idea from the
diagram on this page:

http://en.wikipedia.org/wiki/River_Lee_Navigation

Presumably there isn't any need for water from the brook to feed the Lea
Navigation between Stonebridge and Tottenham Locks. If the brook is ever at
a lower level than the Navigation then that's your answer. Failing that, it
could be something to do with the Lea and New River being major sources of
fresh water for London.

D A Stocks