In message , at 08:54:44 on Fri, 8 Jan
2016, Roland Perry remarked:
In message , at 07:05:35 on Fri, 8
Jan 2016, Clive D. W. Feather remarked:

One of the reasons I'm not convinced that the New Bedford is tidal in
the sense of going up and down twice a day is that when it floods at
Welney the water doesn't flow away to the Wash for weeks.

But is that the New Bedford flooding or the Old Bedford or Delph?

Anyway, heavy flow from upstream could overwhelm the tidality.

The point at which "flooding is possible" measured on the New Bedford
is 2.4m AOD, and it's pretty much spot on that today.

The peak tides at Kings Lynn are currently is 2.2m (and the average
around 0.6m)

for clarity, that means today's mid-tide, not an average of high tides.

so that's not going to be flowing inland as far as Welney, nor does
the chart for Welney show any indication of waters backing up in tune
with the tides.

We should revisit this in the summer when it's drier (or perhaps find
some historic data).

--
Roland Perry