John Rowland wrote:

According to http://en.wikipedia.org/wiki/River_Thames,

"One such example exists at Chiswick Lane South in London's W4 postal
district, where the river now bursts its banks almost daily between March
and September".

Why would tidal flooding be dependent on the time of year?

Something to do with the phases of the sun & moon leading to higher
tides
in that period maybe? If it were due to higher rainfall or winds
driving the sea
inland you'd expect it to happen more in winter.

B2003