GC8

As title: does anyone know exactly where the 'dyke' is? It flooded badly in June this year, but thats all that I know. I cant find it on any maps that I have access to, nor can I make it out on any satellite mapping (Google's is clearest, but Ive failed so far).

Id be grateful if anyone could point me in the right direction, or even give directions I can follow on a satellite iomage, from the nearest roads.

Simon