chris mills, post: 440076, member: 6244 wrote: Should have asked this earlier - if it is salt water is the 8 metre depth at high or low tide and what is the tidal range?
Hi Chris. From what I can gather, the 8.0m is low tide. Not sure of the range sorry.
If the 8 metres is low tide then the water depth is probably going to be 12-15 metres at high tide. That's not going to be practical to pump out between tides if you only use an 8 metre coffer, so the enabling works are going to be massive. I just find it hard to believe that somebody would construct the slipway first and only then think about how to put in the rails.
I can't think of any other practical way except a U shaped piling and you then have the problem of extracting all the piles - no good leaving cut off bits to possibly wreck any boat launch.
Well, The CORPS is constructing a dam in the dry and setting the giant LEGO block size pieces in the water with 1" or less accuracy. I guess we can do that with a 2.3 billion dollar budget. So, what's a millimeter or two worth? See http://www.waterpowermagazine.com/features/featureinnovations-at-olmsted-dam/
