Half tidal access

[Guest]

Hi,

It is possible my understanding is limited ( a polite way of suggesting that I'm being on the thick side) but - by and large will the depth of water at half tide always be the same, regardless of whether it is springs or neaps?

It seems logical that if the range is greater, then the mid point must be the same. The reason for the question is that I have a half tidal mooring and I can only just get the boat off at neaps - a local marina is offering access 3 hrs either side of high water on a mud berth. Are they telling fibs of should I move my boat there toute suite?

I'd check this out by doing the sums but my almanac is on the boat ......

Regards


Fred

 

[andyball]

In chichester, springs/neaps give the same height at around 1 3/4 hrs before low water, and 4 hrs after low water....so no ,the depth isn't the same at 1/2 tide. From my limited experience a "1/2 tide" berth rarely allows access for 1/2 the tide(except in a dinghy,with no outboard).....and a +/- 3 hrs access is usually on high springs with a boat drawing well under 2 feet.

 

[davel]

If you do your sums and check, you'll find that half tide is more or less constant. I'm defining half tide as being (high tide + low tide) divided by 2.
If you take a look at the hydeo office web site ( http://www.ukho.gov.uk/tideprediction.cfm?region=1&locale=England&portid=0065 ) you can see this illustrated graphically pretty well.

Dave L.