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Old 25-05-2014, 03:57   #1
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Need help to understand harbor info from Reeds almanac

From Dielette port information (Reeds almanac, area 18, Central N France):

"Outer hbr entr dredged to CD+0.5m; accessible for 2.5m draft with Coefficient > 55"

Questions:
1) "harbor entrance dredged to CD+0.5m" - let's say hbr.entr was drying land with 2m over CD, so after being dredged to CD+0.5m, it is now 1.5 over CD. Correct?

2) "accessible for 2.5m draft with Coefficient > 55" - what coefficient almanac talks about?
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Old 25-05-2014, 07:31   #2
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Re: Need help to understand harbor info from Reeds almanac

It seems that you are not the first one..just found an old thread on ym scuttlebutt
Almanac correction - access for Diélette
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Old 25-05-2014, 13:10   #3
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Re: Need help to understand harbor info from Reeds almanac

Quote:
Originally Posted by Tellus View Post
It seems that you are not the first one..just found an old thread on ym scuttlebutt
Almanac correction - access for Diélette
This link is broken.

Any ideas what would be the depth after "harbor entrance dredged to CD+0.5m" ?
And what is this "Coefficient > 55"?
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Old 25-05-2014, 18:42   #4
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Need help to understand harbor info from Reeds almanac

Quote:
Originally Posted by dokondr View Post
This link is broken.

Any ideas what would be the depth after "harbor entrance dredged to CD+0.5m" ?
And what is this "Coefficient > 55"?

This is a French term. Its signifies the relation between. One tide at the next.

70 indicates an average tide > 70 the tides tend towards springs . Less they tend towards neaps. It's used a lot in relation to cill heights.

50 is mean neaps so the entrance is accessible for those draughts from mean neap tides +. The lower the co-efficient the wider range of tides that the depth is valid for.

Dave

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Old 25-05-2014, 19:02   #5
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Re: Need help to understand harbor info from Reeds almanac

Those coefficients are not limited to France. We have the same information in many cases for tides & current here in the San Francisco Bay region. instead of tide heights as noted for about 85% of the locations and current strengths for over 60%, the rest are expressed as coefficients, which is simply a multiplier of other figures given in the tables & charts.

Who said high school math wasn't important?
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