Graeme Wall wrote:

Cor, so it does.....
How did I miss that? (Rhetorical question...)

Which puts the stream & the lake at the bottom of the hill *exactly*
level with the canal, & the base of the silos 15 metres higher. Drat,
that could have saved a *lot* of discussion.....

You're right about the leisure interests in canals now, & the leisure
boaters would be *most* upset at commercial carriers claiming priority
through the locks, as used to be their right when I was floating about.

(Jason & his pair on the Grand Union delivering lime juice from the
docks to Roses at Hemel Hempstead in the 70s & early 80s. *Never* get in
his way, his boats were *heavy* & made of thick steel & they'd got no
brakes.)