LOCATION Several factors go into selecting a proper anchorage:
• Protection – If winds are going to be a factor during the night (anything over 15 knots) it is a good idea to anchor where there is protection from the wind and the waves it will generate. • Water Depth – The water needs to be deep enough so you’re still fl oating at low tide and this minimum depth needs to be maintained throughout the area of your swing. The anchorage should also be shallow enough so your scope is not too steep (more on scope in the techniques section). • Swing Room – There needs to be an open spot where you will not swing into other boats, the shore or rocks; generally a hole about 100 to 150 yards in diameter works well. • Holding – What is the bottom like? Most of the anchorages in this area have mud bottoms which provide good holding, but, at depths shallower than 25 feet, they can be covered with seaweed. Also be wary of rocky bottoms (it is easy to get your anchor stuck and/or diffi cult to get a good set) and gravel (the holding is not great). • Current – Is there going to be any appreciable current during your stay? • Neighborhood – Look around at the boats near your proposed spot to see if their temperament matches yours; is there a party going on, do they have children onboard, is there a generator running, etc? Also, be considerate of others; if your planned activities will be noisy, anchor downwind and out further.
TECHNIQUE Probably the easiest way to relate
anchoring technique is to walk through a typical anchoring:
The process should start before
you get to your destination by listening to the weather and looking up tide and current information. This tells you which side of the anchorage to favor; for example if the winds are predicted to be southerlies anchor near the south shore for better protection. And, of course, knowing the tides indicates the depth of water needed.
Knowing the predicted winds
and tides is also necessary in order to calculate the scope. Scope is defi ned as the ratio of the total amount of rode played out divided by the distance from the anchor position on the bottom to the bow roller. For example, if you had 120 feet of rode out and the water was 26 feet deep and your bow roller was 4 feet above the water your scope would be 120 divided by 30 or 4:1. Most of the books recommend a
ratio of 7:1, but in our crowded, local anchorages with good holding and normally mild conditions, 4:1 is more the standard. But, if the conditions
worsen, be sure to let out more scope. Once the needed scope ratio has been determined you can calculate the amount of rode to play out; here is my basic formula: Current water depth + Expected increase in tide + Height of bow roller) X Scope ratio = rode needed. For example, in 26 feet of water
with a 6 foot tide, 4 foot high bow and a scope of 4 to 1:
(26 + 6 + 4 = 36 ft) X 4 = 144 ft of rode. The next challenge is to fi nd a
spot to anchor, taking into account all the items listed above under Location.
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www.ukhalsey.com -
northwest@ukhalsey.ca 48° NORTH, AUGUST 2010 PAGE 33
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