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| Public domain image by Ala Beara via Wikimedia Commons |
The Kilcullen Diary's article about water safety made me think about the "Sally Hole" adjacent to St Brigid's Well being one of the danger spots where the river narrows a bit. I'm thinking there's a venturi effect and speed increases (like the way a carburetor works). Possibly this scours the bend, deepening the river bed, hence the Sally Hole?
Image courtesy OSI (Taillte Éireann)