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Discussion Topic: Potter Heigham Bridge Height Calculator
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Strowager |
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Mardles sometimes
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quote:" just one thing the level indicator in the office is it showing 5'10" or 5'8"?"
You gave me quite a sinking feeling there Ian. 
The Pilot's office gauge appears to be graduated in one inch increments, with a broader dash every three inches, and a number every foot.
The numbers increment downwards, because the lower the float the higher the air clearance number.
The pointer is on the second division above six, hence the five foot ten inch reading.
(and I'm very relieved that I'd got it right !  )
This message was edited by Strowager on Jan-6-13 @ 3:30 PM
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palmtree |
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Hi,
Sorry for the panic, now I can see the full scale it makes sense!
Ian
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Richard |
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That is really brilliant, well done Strowger! I'm going to make this thread sticky.
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Strowager |
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Mardles sometimes
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Thanks Richard, it should now enable anyone to satisfy their own curiosity of how the air clearance is doing at Potter.
A great idea of Palmtree to take that set of photos.
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jitterbug |
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Learning The Ropes
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Hi everyone,
Quick question to find out what the water levels are like in horning and potter heigham area? We are in cambridgeshire and with the high rainfall our rivers have escaped their banks!
We are hoping to move our yacht from ferry marina to its new berth at hickling this friday and wanted a bit of insight in to how levels are there, will save us a journey if potter bridge not "dooable!"
Thanks
Matt
Yacht Jitterbug
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londonrascal |
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I think I am right in saying that if you look at the photo attached to the first post in this thread, you use the calculations from the Environment Agency's water level gauge (web link in first post also) and by applying the formula get the river level at Potter Heigham Bridge - meaning you need not be at Potter Heigham or see the gauge at the bridge/pilots office to get an idea of the air draft.
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Siddy |
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On 16th it was showing 5'2" at the bridge blowing a gale, water over the bank on the free grass moorings on the right and we got on moorings near bridge office.
Today at 1200 it had dropped 4" and like a mill pond.
Siddy
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FishersHaven |
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I thought this thread deserved a bump, found for me by expilot as a perfect answer to my question.
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Jeremy-Aslan |
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The clear info from Strow at the beginning of this thread is very useful.
Another way of calculating the same result, which I find easier, is as follows:
Google 'Environment Repps' and the first hit is the reading up to 4am that morning at Repps
From that trace, figure out what the height will be at the time you want to go through TODAY.
Then, 0.5m = 6ft clearance (as per Pilot Office Gauge). Work out how many cm 'better' than 0.5m it is, then convert to inches (where 2.5cm = 1 inch, roughly), and it's that many inches greater than 6ft. I.E., 0.35m is 15cm better than 0.5, so 6in better than 6ft, = 6ft 6in.
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wombat1 |
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Boy am I glad I know we cant get underneath! 
LAGER THAN LIFE
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Limbury1 |
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Me too, my problem is ludham bridge im nervous about it.last time I was there I couldn't get under according to the measurements so aborted it .So I've got to get up courage and try I need 8ft 6ins to scrape under.
Limbury 1
If you can't see it it's not there ,if you
can see it , it's still not there,the world
is all Illusion.
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Jan-06-2013 @ 4:28 PM
Mar-18-2013 @ 3:21 PM
