‘A centreline is not for mooring, and in the worst case on flooding rivers, its use can pull a boat over’
Now is the time many boaters get their winter fuel stocks in. That’s fine but on a narrowboat it’s hard to accommodate more than a very few bags unless you store them on the roof. If you do, remember that this will raise the boat’s centre of gravity and allow it to rock much more. The effect will be worse if you tie up with a tight centreline. A centreline is for handling, not mooring, and in the worst case on flooding rivers, its use can pull a boat over.
Talking of flooding rivers and lines, it is always safer to have a very long flood line ready to run from the front of your upstream facing boat to a strong tree or post. I would not trust a welded T-stud and would have a separate strong point fitted for this use.
If you are not on a floating pontoon, also have some long poles ready to put between your boat and the bank and driven into the riverbed so the boat cannot ride over the bank and strand itself when levels drop.