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The Norfolk Broads Forum / General Chat / Thorpe Railway bridge clearance
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Posted By Discussion Topic: Thorpe Railway bridge clearance

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daviddownunder
Apr-06-2017 @ 8:02 AM                           Permalink
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G'Day Forumites

Local knowledge required please

If Norwich has a low tide at 19.39 (for calculation purpose I will use this time for the Thorpe bridges) and the bridges have a 6' clearance at high tide, is there a way of calculating roughly (I know tides can vary in size, and time) what the clearance may be around low water, or is there a falling calculation that I can use (say the water level drops by 4" every hour).
We will be hiring a cuiser that needs 7'3" clearance and we wanted to get under the bridge to stop off at Thorpe Green and visits the Rushcutters, But I am hoping to get under the bridge before 19.30.

Any info welcome

Regards
Dave Downunder

Paladine
Apr-06-2017 @ 8:59 AM                           Permalink
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There is a chart here that you may find useful.

"..for the avoidance of any doubt, the broads are not legally a national park and do not come under the national park legislation, and nor will they."
Parliamentary Under-Secretary of State for DEFRA (Hansard 2015)

ChrisHGB
Apr-06-2017 @ 9:24 AM                           Permalink
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Hi David,
I know where you are coming from. I am on my phone at present so can not post any links. (Strangely I am in a queue in North Walsham PO to buy travel insurance for a trip to Melbourne).
There is a calc/formulae/extrap. Called the "Rule of Twelths" google:Understanding the rule of twelths and it will explain how the tide rises and falls. I will try to post a link or two later. Hope this helps. Chris

EDIT:To say, certain digital tidal watches Casio being an example work on the rule of twelths.

Chris.

I have swallowed the anchor but
have not tried mud weight yet!


This message was edited by ChrisHGB on Apr-6-17 @ 9:26 AM

boat-mad
Apr-06-2017 @ 9:25 AM                           Permalink
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Hi daviddownunder

If there are moorings available you could moor up in Commissioners cut (Right hand side just before Thorpe Bridge). You can then cross the pedestrian rail bridge and turn left at the bottom.  You then don't have to worry about waiting for clearance to go back through.

If I am determined to go through I some times near the bridge, note the clearance, go into commissioners cut and moor up, note what the level of the water is up the bank and using this as a guide I keep a watchful eye until I can see the level has dropped enough to allow sufficient clearance. Smile

Kind Regards
Alan...
www.mynorfolkbroadsboating.co.uk/


This message was edited by boat-mad on Apr-6-17 @ 9:27 AM

ChrisHGB
Apr-06-2017 @ 9:51 AM                           Permalink
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WARNING

Having posted it occured to me that I should add that "The Rule of Twelveths" assumes normal tidal behaviour and follows kind of a "Sine Curve".

It should therefore NEVER be use in areas such as the Solent, Poole Harbour or any other area that experiences Double Highs or Double Lows.

Chris.

I have swallowed the anchor but
have not tried mud weight yet!

TerryTibbs
Apr-06-2017 @ 8:59 PM                           Permalink
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Can't resist the call of the Broads then Dave?  Smile

Hope to see you out on trhe river

Dave

Je suis Charlie

TerryTibbs
Apr-06-2017 @ 9:01 PM                           Permalink
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Don't forget if you can't moor at Thorpe Green you could always moor at Commisioners Cut and walk back to the Reedcutters

Dave

Je suis Charlie

Harlequin
Apr-06-2017 @ 12:21 AM                           Permalink
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As ChrisGHB points out the rule of the twelfths is good as a general guide but like all aspects of tidal predictions is subject to local variations and oddities. As such it should be used as a useful indicator only.

daviddownunder
Apr-07-2017 @ 2:27 AM                           Permalink
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Paladine - Thank you for the link to the table, I am sure I will find this useful.
Chris (Chris HGB) - I hope you enjoy your trip to Melbourne, we live on the other side of the country in WA. If you can find a link to the rule of twelfths I will have a look at it.
Alan (Boat Mad) - Thank you for the thought of commissioners cut, we have walked this in the past, but my wife now has mobility problems and would not be able to walk that distance.
Dave (Terry Tibbs) - Yes we need another Broads fix, it is a terrible affliction this Broads bug when it bites, costs me thousands of $$$

Thanks to all

Regards
Dave Downunder

ChrisHGB
Apr-07-2017 @ 7:40 AM                           Permalink
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http://www.inyourfootsteps.com/sailing/tips/35/310/%27rule_of_twelfths%27%3A_a_simple_method_for_estimating_intermediate_tidal_heights/?

Chris.

I have swallowed the anchor but
have not tried mud weight yet!

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