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<p>On 2019-07-13 21:33, Tony Shield wrote:</p>
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<p>Hi</p>
<p>Personally think that High Water Mark and Low Water Mark are very relevant to people and to OSM.</p>
<p>Yeah - tides are a nuisance and can never be predicted with total accuracy and with Global Warming HWM and LWM will change over time. Then there are Highest and Lowest Astronomical Tides, and then tides which increase or decrease according to weather conditions (pressure and wind) (New Orleans tonight is a good example). There are probably a few others which I have forgotten....</p>
<p>Knowing the inter-tidal area at Hunstanton is important, as are those in Morecambe Bay and the River Dee(North Wales/England) where paths cross the area. </p>
<p>How many beaches are there on the Thames? and what is the inter-tidal ground like - sand, shingle, mud . . . .And what and where is the access? These questions are what OSM is about. </p>
<p>The OS recognises this and on their maps marks the coastline/MHW with a dense line, but not on non-tidal waters. </p>
<p>OSM needs the equivalent of MLW - as far as I know its not defined (and I do not feel competent to define) - and I think that Borbus is on the good path.</p>
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<div class="moz-cite-prefix">What exactly do you mean by MLW not being defined? Do you mean that there is not a robust definition of the concept? Or that it is difficult to establish the exact line of MLW?</div>
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<div class="moz-cite-prefix">Another reason to want MLW in OSM: The "Extent of the Realm" is *for the most part* defined as MLWS. This is the limit of the jurisdiction of normal (local) government. Beyond MLWS, the local council no longer has any say - it's the UK laws of the sea, as applicable to territorial waters.</div>
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<div class="moz-cite-prefix">I agree that Borbus is doing good things!</div>
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