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  1. #1
    Join Date
    Mar 2015
    Posts
    1,020

    Default Anyone ever measured the tidal flow in Orwell and Stour?

    Just curious really. My log is bust so Iíve never known. My charts are on the boat but I have a feeling that the tidal diamonds only go as far in as harbour mouth.

  2. #2
    Join Date
    Feb 2007
    Location
    Essex
    Posts
    23,089

    Default Re: Anyone ever measured the tidal flow in Orwell and Stour?

    It has never occurred to me to think about it. The current in rivers is usually fairly predictable, being stronger on the outside of bends, for example. In Harwich the stream can be strong as it runs over the shallows by the Guard and inside the breakwater. Keeping close to the town side can gain or lose time as you pass the Stour as the stream turns into that river there.
    Far away is near at hand in images of elsewhere

  3. #3
    Join Date
    Jul 2011
    Location
    Levington
    Posts
    688

    Default Re: Anyone ever measured the tidal flow in Orwell and Stour?

    Some information on HHA website, although it only covers the bottom of the Orwell

    https://hha.co.uk/wp-content/uploads...ps-All-NEW.pdf

    It seemed pretty strong when we decided to swim off the back of the boat near SYH recently
    Yacht: White Pearl - Jeanneau Sun Odyssey 32i

  4. #4
    Join Date
    Aug 2007
    Location
    Suffolk
    Posts
    5,187

    Default Re: Anyone ever measured the tidal flow in Orwell and Stour?

    Quote Originally Posted by John 32i View Post
    Some information on HHA website, although it only covers the bottom of the Orwell

    https://hha.co.uk/wp-content/uploads...ps-All-NEW.pdf

    It seemed pretty strong when we decided to swim off the back of the boat near SYH recently
    it would be, you were on the outside of the bend.
    Racing keelboats in the rivers for 15 years or so we got very aware of the tidal flows and how to benefit from them without, hopefully, going aground too often. The flow can vary dramatically between different sides of the river even on straight bits as the deep water where the flow is strongest isn’t always in the centre.
    In some places the flow can be opposite around the turn of the tide and it can make a huge difference, a case in point is in the Orwell between the No 6 buoy and Woolverstone. The tide starts to ebb on the South side of the channel around 1 hour before HW when it is still flooding in the deep water and on the North side. On the flood there is a strong back eddy just above Collimer point, etc. Overall rates in the Stour are greater than in the Orwell, perhaps one and a half times or more greater.
    hope this is useful.

  5. #5
    Join Date
    Jun 2011
    Location
    Bath / Wrabness
    Posts
    1,122

    Default Re: Anyone ever measured the tidal flow in Orwell and Stour?

    The general, if unscientific, consensus at Wrabness is that current speed has increased over the years, perhaps because the dredging in the harbour allows more flow. I've never really quantified is as it's so variable.

    I certainly can't swim or row against the current as easily as fifty years ago!
    The more I know, the less I understand

  6. #6
    Join Date
    May 2001
    Location
    Norfolk/Suffolk
    Posts
    3,109

    Default Re: Anyone ever measured the tidal flow in Orwell and Stour?

    I don't have any evidence but the flows seem to have changed on the Orwell in the last two years, there almost seems to be a "stand" at half ebb but then speeds up again, or I could be imagining it Perhaps the dredging has changed the eddy pattern?
    Harwich for the Continent - Brexit For the Incontinent . Sadler 290

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