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Old 20-05-2019, 08:48   #16
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Re: Unique Way of tying off to pilings in slip to keep boat centered during storm sur

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Originally Posted by er9 View Post
I've never been to a marina in the hurricane zones of the US but dont the docks rise and fall with the tides? here in southern California, marina del rey they float and rise/fall 7-8 feet with our tide. we have pilings but they go through the docks and the dock rolls up and down the piling. is it not this way everywhere?
In non-fixed shoreline wharf marinas, yes floating docks that extend out into the waterways are the norm where there is tidal changes.

Of keen issue with hurricanes is the dramatic storm surge which causes rapid rises and lowering and extreme current and of course local waves.

If conditions get rough the floating docks can break free from their mooring piles and then all hell happens as the raft and associated boats shift and collide.

If the piles are not tall enough then the docks can ride off the top. Also the lever arm onto the piling increases as the docks ride up and that can lead to failure of the piling. It tends to be a rapid cascade of failures in a marina when a piling or dock fitting breaks loose as the freedom of movement on what part of the string of structures stresses the next fixture in line.

And of course if the boats can ride up onto the top of piling it will in turn become a hard and piercing object to the bottom of a hull.
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Old 20-05-2019, 08:57   #17
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Re: Unique Way of tying off to pilings in slip to keep boat centered during storm sur

Quote:
Originally Posted by er9 View Post
I've never been to a marina in the hurricane zones of the US but dont the docks rise and fall with the tides? here in southern California, marina del rey they float and rise/fall 7-8 feet with our tide. we have pilings but they go through the docks and the dock rolls up and down the piling. is it not this way everywhere?
There are Fixed Docks and Floating Docks. Storm surge is less of an issue with floating docks (unless the surge floats the docks above the tops of the pilings, which 'can' happen.

The OP description would apply to fixed docks, which can be tricky with storm surge. Leave the lines normal, and when the tide surges, there is too much slack and the boat 'pinballs' off of the pilings. Leave the too short, and when the low tide occurs, the boat is essentially 'hanging' from the lines tied to teh piles.

On fixed docks, once the docks go under water and swell starts rolling (if the docks are somewhat exposed) then you don't (don't want to) go out to tun the lines in the middle of a storm.

I sat through hurricane Irene in 2011 on fixed docks. I had sixteen docks lines and 10 fenders. The docks were 3 feet below the water with 3 foot breaking waves rolling through the marina. My neighbor's rub rail knocked the cap off of the top of the piling.
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Old 20-05-2019, 08:58   #18
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Re: Unique Way of tying off to pilings in slip to keep boat centered during storm sur

Quote:
Originally Posted by er9 View Post
I've never been to a marina in the hurricane zones of the US but dont the docks rise and fall with the tides? here in southern California, marina del rey they float and rise/fall 7-8 feet with our tide. we have pilings but they go through the docks and the dock rolls up and down the piling. is it not this way everywhere?
Marina del Rey has its natural hazards too.

Watch the effect of the tsunami in 2011 linked below, fortunately it arrived at not at high tide and was not that major in California.

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Old Today, 06:45   #19
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Re: Unique Way of tying off to pilings in slip to keep boat centered during storm sur

Mooring rings are nice and a good concept but I'd never use a wing nut on a fastener like that . . . . use a nylon "locking" net so the chance of it coming loose is down to nil!! Also, make sure you use at least a grade 8 bolt.
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