Monday, 30 July 2012

Damming effect


We might stand at near 100m above sea level but Cranfield has its flood hot spots. This is from the latest CBC customer services bulletin with Amey's reply. 



XX-YY High Street   Cranfield: Dear Highways Department/Amey Contractors    This problem is related to a pair of sunken dropped kerb stones at XX High Street that promote the flooding of XX-YY in rainy weather.    Proposed Solution - raise the sunken kerb stones that have subsided.    However...    Last week Amey contractors raised part of the footpath and entrance to the drive of No XX with the addition of some tarmacadam to the existing footpath and drive entrance.  The result is that the water from the road still drains into No XX because the kerb stones were not raised to a suitable level and surface water is allowed to run over the kerb from the gutter into the properties.  Excess surface water now drains towards my own property No YY.  The damming effect of the new tarmac redirects the flow somewhat from the join at the junction of the grass verge and kerb.    

A site visit would easily confirm the diagnosis, proposed solution and show the wasted effort and resources to date (perhaps not entirely wasted but not addressing the main cause of the surface water run-off).    I look forward to hearing your views and your setting a date to raise the (minimum of) 2 kerb stones 15mm or so higher outside No XX.  I am also concerned that the soon to be introduced traffic calming might also have a detrimental effect too though I am not sure exactly where the road level is to be raised.   


Amey has replied:
thank you for the photos which seem to show the present low spot for water to flow over onto the path in extreme rainfall. Could you see if the gully in the layby was working? It is highly likely that in such weather conditions at the time, the rising water level would find the next low spot to flow over. There is also a very large area of paved area and footway that collects water as well, so it would be very difficult to prevent water building up on the path.   I will inspect the area again in rainfall.





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