London Banter - View Single Post - New Bermondsey station (Surrey Canal Road)

Roland Perry · January 6th 16, 09:18 AM posted to uk.transport.london

In message , at 09:27:15 on Wed, 6 Jan
2016, d remarked:
And was the Cam ever tidal, say in Newton's time, at Cambridge ?

It's an awfully long way from the sea, so no.

That doesn't mean a lot. The Thames would be tidal all the way into Berkshire
if it wasn't for the lock at Teddington. What matters is whether a given
part of the river is above high tide level.

No, it also depends on things like the width of the river and whether
there's enough time for the tidal waters to get that far upstream before
the tide turns.

Salt water rarely travels far upstream. What happens is that the water in the
river starts to back up and that can happen pretty quickly depending on the
flow rate.

Well, ignoring the four locks in the way (yes, three of those are
post-Newton) you won't get a backup all 40 miles to Cambridge on a river
flowing as slowly as the Cam (it rarely exceeds 6 cubic metres a
second).
--
Roland Perry