We have been observing a
problematic section of the Trent and Mersey Canal in Cheshire since 2002 and have repeated readings
on more or less an annual basis. Over this period, the microgravity results suggest increasing anomalies and that the underlying salt mines which were the reason why the canals were constructed in the first place are becoming less stable. This may be due to leakage from the canals themselves or more frequent intense rainfall as the climate changes.
A recent
collapse of a section of the same canal nearby at Middlewich, which caused great disruption and almost led to loss of life, has brought our work into sharp focus. The proposed route of Phase 2 of HS2 is planned to cross a significant portion of this Cheshire Salt Field where subsidence is very common and the engineering challenges for this high-speed line will be considerable. We have contributed to a new
Channel 5 series on sinkholes that has covered this issue and our work in some depth. We hope to be able to give guidance on how the area should be fixed and where this technique might be utilised to map other vulnerable areas along this network of waterways. After all, it is possible to do something about sinkholes – if they can be detected in time.