NorfolkNog Posted August 18, 2014 Share Posted August 18, 2014 Potter Heigham Bridge has started Tweeting! A very helpful daily update gives the current bridge height which looks to be a useful resource. The prospects at the moment don’t look too good however! @PotterBridge Some of the stuff on Twitter can be a bit banal but there are some informative and interesting established contributors on there including Carol’s Broadland Memories and the Museum of the Broads which are well worth following. 4 Quote Link to comment Share on other sites More sharing options...
Gracie Posted August 18, 2014 Share Posted August 18, 2014 Potter Heigham Bridge Has started Tweeting!, Blimey Howard that's one clever bridge. what ever next Boats using Facebook seriously, thank you for the info Grace 2 Quote Link to comment Share on other sites More sharing options...
NorfolkNog Posted August 18, 2014 Author Share Posted August 18, 2014 Ha ha, Grace, yes indeed, a very clever and knowledgeable bridge Quote Link to comment Share on other sites More sharing options...
BroadScot Posted August 18, 2014 Share Posted August 18, 2014 Ha ha, Grace, yes indeed, a very clever and knowledgeable bridge Naw it isny Howard, if it was, it would learn how to increase in size so I can get through it when on holiday! Iain. 2 Quote Link to comment Share on other sites More sharing options...
Boaters Posted August 19, 2014 Share Posted August 19, 2014 Thanks for the link,I know they are busy but it would be great if the pilot could post some guidance when a passage may be possible,or some one maybe local tweeting height on a daily basis ? 1 Quote Link to comment Share on other sites More sharing options...
ExMemberBobdog Posted August 19, 2014 Share Posted August 19, 2014 Naw it isny Howard, if it was, it would learn how to increase in size so I can get through it when on holiday! Iain. Oh yes it is, it lowers when it sees you coming so that I can have Hickling and Horsey all to myself 1 Quote Link to comment Share on other sites More sharing options...
unclemike Posted August 19, 2014 Share Posted August 19, 2014 not the only bridge on't net ,-https://www.facebook.com/pages/Ludham-Bridge/490341551033500?fref=ts,hope this works not tried a link before mike Quote Link to comment Share on other sites More sharing options...
unclemike Posted August 19, 2014 Share Posted August 19, 2014 seems to work, great even got a pic of chameleon on the page, mike Quote Link to comment Share on other sites More sharing options...
ZimbiIV Posted August 19, 2014 Share Posted August 19, 2014 Great if that d--- bridge is now on twitter ( whatever that is) means it will not be blocking the river now!!!!!! paul 1 Quote Link to comment Share on other sites More sharing options...
Timbo Posted August 20, 2014 Share Posted August 20, 2014 Potter Heigham Bridge Has started Tweeting!, Blimey Howard that's one clever bridge. what ever next Boats using Facebook seriously, thank you for the info Grace Now Gracie...Royal Tudor has been tweeting for a while and is working on her own website! Definitely a silver surfer. 2 Quote Link to comment Share on other sites More sharing options...
Gracie Posted August 20, 2014 Share Posted August 20, 2014 Well Timbo, not only is Royal Tudor beautiful but very clever as well I want one lol Grace 2 Quote Link to comment Share on other sites More sharing options...
BuffaloBill Posted August 21, 2014 Share Posted August 21, 2014 There is a river height gauge at Repps. See here:- http://apps.environment-agency.gov.uk/river-and-sea-levels/120738.aspx?stationId=6217 Hope that works! Apparently 0.32mts equals 6'5" bridge clearance. 1 Quote Link to comment Share on other sites More sharing options...
Guest Posted August 21, 2014 Share Posted August 21, 2014 0.32 metres on the Environment Agency's Repps gauge would be equivalent to 2.01 metres on the height gauge inside the Pilot's office at the bridge. If it's still calibrated in feet and inches then that would be showing a smidgeon over 6 feet 7 inches. When trying to state the bridge clearance precisely it becomes tricky because all three gauges (upstream, downstream, and Pilot's office) are not calibrated the same, with a 4" difference between them. The Pilot office gauge is generally accepted as the most accurate, though even that is arbitrary, being not the exact height of the centre of the arch, but a notional square shape passing through the semi circle. To get the height of that gauge in metres, simply deduct the online Repps reading from 2.33 metres. (Then multiply the result by 39.37 if you want it in inches). Quote Link to comment Share on other sites More sharing options...
Hockham Admiral Posted August 22, 2014 Share Posted August 22, 2014 Thanks for those, Bill & Strow. :clap I've seen them posted before but hadn't bookmarked them here in my laptop. Quote Link to comment Share on other sites More sharing options...
Guest Posted August 22, 2014 Share Posted August 22, 2014 Potter's arch had always intrigued me, trying to ascertain the exact height of the arch in relation to the gauges. Hamilton had a stab at it, many years ago. This diagram from one of his old guides shows his calculations of the arch curve, but unfortunately he never completed the reference to the gauges, though he did mean to. I mused over the different ways it could be surveyed accurately now, and the simplest was to take very high resolution photos exactly square on, and scale them by accurately measuring more easily accessible reference points. Comparing it with Hamilton's, this gave a waterline width of 20 feet 8 inches to his 22 foot "datum line". He didn't give the water level height though, so maybe it was during an even lower tide back in the old days. The weak link in the exercise is that the BA might reset the gauges at any time, making them (hopefully !) more accurate, or at least more consistent. It does however show the radius of the arch accurately, and the effect of wider, flatter, cabin topsides on the actual air draught. It shows one of the problems of modern boats getting through, such as a modern 8 foot wide cabin roof needing 4" more clearance than the more traditional 6 foot wide cabin roof. (I've had to downscale the images to be able to upload to the forum, so the pixels per inch are now less, as the originals are 6000 x 4000, to get the accuracy). Quote Link to comment Share on other sites More sharing options...
BroadScot Posted August 22, 2014 Share Posted August 22, 2014 You would think, with all the electronic wizadry that is available today a lazer gun of some sort, could tell you exactly to the millimetre the height and width at any given time or tide. In my case feet and inches! Iain.. Quote Link to comment Share on other sites More sharing options...
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