23-11-2023, 07:42 PM
I shared Dave Mann's concern about the aqueduct being made of cast iron when I helmed a narrowboat across it. The boats bang from side to side because of water rushing through the narrow gap between the hull and the aqueduct wall, if you happen to get the boat off centre. Considering how many thousands of boat crossings must have gone like that over the life of those cast iron wall plates I wondered what the fatigue life of cast iron was.