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No idea I'm afraid. The Fillebrook bubbled up recently pretty spectacularly at Whoops Cross and loads of other roads that are built over it.
There is a section near me where you can always hear rushing water (Newport Rd E10 if anyone wants to hear it) but on the evening of the floods, when I passed the normally noisy manhole, it was totally silent. /csb
doubleodavey
How are the buried rivers maintained? Do they regularly send cameras down there to inspect the tunnels?