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  #11  
Old 03-25-2011
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Quote:
Originally Posted by jackdale View Post
A quick survey of my tide table show a range of 4 to 7 hours.

Our tides are mixed semi-diurnal. The range can be as slight as .1 meters and as much as 4 meters.

We use separate tide and current tables. The turn (slack) seldom coincides with high tide. The worst current we deal with is 16.5 knots.
Around Rupert I think the tides are routinely around 6 and often 7 meters (20+ feet) if I'm not mistaken. But I have been known to be wrong a heck of a lot. This is a good/interesting thread by the way.
[edit] I think Nakwakto Rapids south of Cape Caution can run at 20 knots or so.
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Last edited by Bilgewater; 03-25-2011 at 03:55 PM.
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  #12  
Old 03-25-2011
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Quote:
Originally Posted by seayalatermoonglow View Post
Around Rupert I think the tides are routinely around 6 and often 7 meters (20+ feet) if I'm not mistaken. But I have been known to be wrong a heck of a lot. This is a good/interesting thread by the way.
[edit] I think Nakwakto Rapids south of Cape Caution can run at 20 knots or so.
I was looking at the Vol 5. Vol 6 and 7 show much bigger tides. Prince Rupert on Feb 18 had a 22 foot range.
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Old 03-25-2011
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Yeah that's pretty extreme from where I'm sitting. We don't have anywhere near that variation. For example for March our lows range from 0.7 to 1.1 and the highs range from 2.8 to 3.6.

Tidal streams here rarely exceed 3 knots.
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Old 03-25-2011
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Jack,
I edited that post cos I didn't think the link to Aztec was working, apparently it was. They deserve attribution. Aztec Sailing Home I only found them yesterday when I was looking for an online example of the graph but it looks pretty good from what I've seen.

Where necessary I just use calculations as per your forms, though in a rougher state I must confess. The Sydney area has relatively small tidal range and except for a couple of small harbours where we go for restocking when off on one of our mini cruises we have little reason to worry about water depths. Tidal current is more important but again not so critical for our local conditions unless racing. In the future we will be in places where tide is so much more important so I needed to bone up on the calculations.

The graphs came up in my course and to me they seemed more trouble than they are worth unless one had a computer to generate the results. I thought maybe I was missing something and that maybe there was a reusable template that people used. Apparently not.

I'm glad some of you found the thread of interest. In this electronic age there are still skills we all should probably know without necessarily getting into the intricacies of full on celestial.

(Sydney tidal range rarely greater than a couple of metres and current under five knots at worst. A few of the barred river mouths up the coast can be a handful and this is where we'll never more accurate info.)
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Last edited by tdw; 03-25-2011 at 04:34 PM.
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Old 03-25-2011
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Here is the next couple of days where we boat:

Times and Heights for High and Low Tides

2011-03-25 (Friday)
Time Height ADT (m) (ft)
04:44 7.8 25.6
11:08 1.0 3.3
17:20 7.2 23.6
23:34 1.5 4.9

2011-03-26 (Saturday)
Time Height ADT (m) (ft)
05:46 7.5 24.6
12:10 1.3 4.3
18:24 7.0 23.0

2011-03-27 (Sunday)
Time Height ADT (m) (ft)
00:38 1.8 5.9
06:52 7.2 23.6
13:16 1.6 5.2
19:31 6.8 22.3

Gets worse at full moons. You don't want to run aground at high tide.

Tides were taken from here.

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Old 03-25-2011
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To the original question: I don't use published graphs, but do note the tidal range for the day of interest. When anchoring in shallow water, I check the graphical data provided on my chartplotter, which shows the diurnal variation and lets me know whether I can anchor in certain areas. The tidal currents in our area are difficult to intuit from tide tables, so I use hourly current charts that are keyed to when the current turns at a specific location. Bottom line: I am more interested in the tidal minimums and use the graphs to determine whether I have enough water depth where I am anchoring to stay off the bottom at low tide.
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Old 03-25-2011
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Quote:
Originally Posted by tdw View Post

I'm glad some of you found the thread of interest. In this electronic age there are still skills we all should probably know without necessarily getting into the intricacies of full on celestial.
I always use the official government tides and current tables in a paper format. They do not have disclaimers.

We still teach students how to determine tides and currents at secondary ports and stations. On my trips around Vancouver Island, tide and current calculation sheets are taped to the walls.
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Old 03-26-2011
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The electronic tide charts are a lot more convenient, but that is only if your electronics are working. Even if you use the electronic version, its always a good idea to have your paper backup for a sanity check and as a backup.

I've twice loss all of my electronics in lightning strikes. If you are away from home, you'd better have dead reckoning skills and the necessary paper charts and--in our area--Eldridge's book for tides and particularly currents. Of course, paper doesn't do much good if you don't know how to use it or haven't kept up your skill set.

I fully support your curriculum and wish there were more sailors out there taking courses that cover traditional methods.
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