High Speed Rail - Transport Committee Contents

Further written evidence from the Chiltern Society (HSR 81A)

I understand that the Transport Committee inquiry into High Speed Rail is seeking evidence relating to the impact on the environment.

Please find attached a link to a report on our website, "Concerns arising from the Geology and Hydrology of the ground underlying the High Speed (HS2) routes through the Chilterns". The report was produced in November 2010 and shared with HS2 Limited. It highlights the fractured nature of the chalk aquifer below the Misbourne Valley, and the risks from tunnelling therein, particularly the risk of polluting the aquifer, which feeds the Colne Valley, which supplies 20% of London's water. Also the risk of losing a globally rare chalk stream habitat.

The Report in full can be found at:


7 September 2011

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Prepared 8 November 2011