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Oliver Schick
@mespilus
Storm Alex was an unwelcome visitor to Ruislip this weekend,
with Thames Water's (unimproved) storm water system overwhelmed
on Saturday morning, with manhole covers lifting off,
and a foul sewer overflowing and leaking into cellars, and one residences gas supply.
Cadent, for the gas problem were quickest to respond,
and Thames Water's contractor unblocked the foul sewer on Sunday afternoon.
The one bright spot is the Natural Flood Management array of leaky dams in Park Wood
delayed the storm water flows though this section of the NNR to the extent
that again, (as after Augusts thunderstorms), no storm water was seen exitting
from the southern perimeter ditch towards the River Pinn.
We are now much better able to quantify local rainfall in Ruislip than for the cloudburst in June 2016 when extensive flooding occurred and the nearest rain gauge was at RAF Northolt.
Working with our local council, LB Hillingdon in their statutory function as Lead Local Flood Authority, we now receive reports:
This is a graph of the output from the (relatively newly) installed rain gauge on Kings' College pavillion and the EA's river level gauge for the Ruilip Pinn:
'At the Kings College gauge, we recorded a total of 27mm on Friday, with a further 46mm on Saturday and 19mm on Sunday. 46mm is a higher 24 hour total than 1st October 2019 (42.5mm), and a Storm Alex total of approximately 92mm . The highest intensity recorded was 14mm/hr on Saturday, compared to 40mm/hr on 1st October 2019.'
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