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  1. #11
    Join Date
    Jul 2001
    Location
    Just a few cables from Boulters Lock
    Posts
    12,595

    Default Re: Why does non Tidal Thames go up and down daily?

    The specific measurement limits were removed some time ago and the current Customer Charter statement is as follows:
    "We manage water levels to balance the many uses of the river including boating, retaining enough for water companies to abstract, managing flood risk and ensuring conservation sites, fisheries and water quality are protected. We measure water levels at lock sites and monitor them 24 hours a day.
    We operate the weirs and other structures to provide the best conditions possible for all uses of the river. Our ability to control water levels may change in flood or drought conditions."

  2. #12
    Join Date
    Aug 2017
    Posts
    351

    Default Re: Why does non Tidal Thames go up and down daily?

    Just had an additional thought. Romney weir has an automatic gate linked to the hydro power screws which will influence levels downstream by small amounts as it adjusts Romney headwater to keep the screws spinning at optimum generating power.
    When I was in the Navy ...

  3. #13
    Join Date
    May 2016
    Posts
    136

    Default Re: Why does non Tidal Thames go up and down daily?

    There are statutory (Government Act) requirements to maintain a certain level (1.72M above ODN to be precise) between Richmond Half Tide Lock and Teddington Lock (except during the annual draw off) but above Teddington it is 'targets' with no statutory backing.

    Probably sensible that it is this way but it does leave the EA as 'Judge and Jury' having to decide between competing claims on the water. I'm no fan of how the EA run many things on the Thames but they do seem to manage this pretty well but by definition won't always keep everybody happy.

    If the EA were remotely like the PLA they would provide lots of open information and even run events to explain how it all works and the criteria used but .....

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