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The Jubilee River story (0948z16)
The Wraysbury levels and drainage issues.
This e-mail (dated
15 September 2016) is for Samina/Andrew/Emma in particular - and copied to
Graham Sinclair (Wraysbury PC) and Ian Thompson (Datchet PC)
Having attended your
Imber Court, Molesey session on Tuesday 13th September……………I have
since realised that having focussed on the channel(s) and water bodies I
neglected to refer to the local water courses and drainage channels.
I will write a short
report in due course but just wish for you to record my apprehension at this
You already know
that the area is very flat and laced with a ‘web’ of drainage channels many
of which lack maintenance.
My first concern is
that the proposed channel cuts through the Datchet Common Brook, the
Wraysbury Drain and the Horton Drain. I feel that I need assurance that the
channel flows upstream and downstream of the intersections will be at least
maintained and possibly even improved.
My second concern is
the effect of the new channel on the overall ‘responsiveness’ of the water
system in the area – in particular that water levels will rise much earlier
and also at a faster rate. This is precisely what happened previously with
the Jubilee River by-passing the natural attenuating features of the Thames.
At present the
Wraysbury Lakes respond relatively slowly to changes in River Thames water
levels. When overland flood flows start to fill the lakes although the rate
of change increases - lake levels still lag well behind the rising Thames
The reverse is also
true – with falling Thames levels well ahead of and much faster than lake
levels. Indeed I have evidence of Thames water entering lakes and of that
water (i.e. water from the lakes) returning to the Thames some days later.
There is then a stage when remaining water trapped in the lakes and unable
to drain raises local groundwater levels for a long period after the floods
These are important
points and I am happy to discuss them with you.
receipt of this e-mail