The Norfolk BroadsThe Norfolk Broads
Username Password
Norfolk Broads Weather

Mon, 11 Apr 2016 7:20 am BST- Light Rain
5 Day Forecast

Wind 2.0 mph @ 40°
48.0°F/8.89°C Humidity 93% Pressure 29.65 (S)

Welcome to The Norfolk Broads Forum
This is THE Worlds Largest Forum devoted to the Norfolk Broads, here you can discuss issues about the Norfolk Broads. Or just somewhere to chat with others interested in the Norfolk Broads area.

Please Help Support The Norfolk Broads Forum
OR

The Norfolk Broads Forum / General Chat / Potter Heigham Bridge and high tides
login
join
Graphics Off
Search
Forum Members - Book your Hoseasons holiday today, Just call 0345 498 6296

This is a moderated forum Reply to this DiscussionReply to Discussion | Start new discussionNew Discussion << previous || next >> 
Posted By Discussion Topic: Potter Heigham Bridge and high tides

Similar Threads That Might Help :
Potter Heigham Bridge, high res photos| Tide Levels at Potter Heigham| Potter Heigham Bridge| Beyond Potter Heigham Bridge|

-- Page: 1 2

book mark this topic Printer-friendly Version  send this discussion to a friend  new posts last

thiswan
Mar-04-2005 @ 6:10 PM                           Permalink
reply
edit
profile
send p.m.
Fens Fatale
Posts: 35
Joined: Feb 2005
thiswan
          

Add To Ignore List
Are the tides getting higher or do we just come on the Broads at the wrong time of year?

What is the answer when your are unable to get under Potter bridge? Fit ballast tanks on the cruiser (like a submarine) or put lock gates either side of the bridge? reroute the river perhaps? or Hire from Whispering Reeds and stay up that side?

Would love to hear any of your suggestions.

Kind Regards, thiswan.

Paul
Mar-04-2005 @ 7:54 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 798
Joined: Nov 2004
Paul
          

Add To Ignore List
Your question is actually an accurate statement of fact !

The apparent gradual reduction in clearance under Potter bridge is due primarily to rising sea levels. I can't remember the precise statistics, but the much quoted 'average high water clearance' figure for the bridge has diminished in the various guidebooks over the years.  
( Craig, how much has it changed in your old hire catalogues since , say 1930 ? )

As for suggestions, the only practical solutions for river users is to buy or hire a boat with a lower air draft. Ballast tanks would have to be huge, my 25ft ex-hire boat has a 'tons per inch submersion' factor of .4  !!  
This means that the weight of six adults will only lower her by half an inch. Or with water ballast, I would need 100 gallons per inch !

As things stand, in another 30 years, only dinghies, dayboats and (some) saily boats will be able to squeeze underneath. (I'm sure they'll be upset about that !) Playful

(I do actually cheat, I keep my ex-hire cruiser at Horning and a small Shetland dayboat at Hickling...   a wonderfully peaceful area, purely because of the bridge.)  
Smile

This message was edited by Paul on 3-4-05 @ 7:09 PM

woodwose
Mar-04-2005 @ 10:52 PM                           Permalink
reply
edit
profile
send p.m.
Mardles sometimes
Founding Member
Posts: 4093
Joined: Aug 2004
woodwose
          

Add To Ignore List
We bought our bungalow at Potter in 1990 and there is no doubt that average water levels are higher now. However, the tides do go up and down quite a lot. A few weeks ago we had very low water.
Perhaps it will be necessary to consult tide tables in future when booking a holiday where you want to be sure of getting under the bridge, although predicting the height of the tide does not seem to be an exact science.

One of the great joys of Potter bridge is that it does protect the area above the bridge from lots of boats and makes this one of the best parts of the Broads.

Nigel
Ludham

woodwose
Mar-04-2005 @ 11:49 PM                           Permalink
reply
edit
profile
send p.m.
Mardles sometimes
Founding Member
Posts: 4093
Joined: Aug 2004
woodwose
          

Add To Ignore List
My bungalow sinks a lot. The ground there is quite unstable. Have to jack it up every few years to keep its feet out of the water.


Craig
Mar-05-2005 @ 11:39 AM                           Permalink
reply
edit
profile
send p.m.
Been Posting For a Long Time
Founding Member
Posts: 2234
Joined: Aug 2004
Craig
          

Add To Ignore List
Paul

Paul - how old do you think I am Mad

Having said that I do have a 1939 Blakes catalogue and guess what - it makes almost no mention on ANY bridge at all apart from those in Yarmouth. The entry for Potter Heigham is:

"There is a speed limit through this waterside village. The fine old three-arched road bridge is the subject of many sketches and photographs, but the yachtsman and cruiser must approach it with great care."

Paul
Mar-05-2005 @ 1:58 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 798
Joined: Nov 2004
Paul
          

Add To Ignore List
Sorry Craig, I was referring to your extensive reference material, not necessarily all bought by you first-hand !

My 2001 Hamilton's gives the AHW clearance at Potter as 6.75 feet, which I take to be 6feet 9 inches  in conventional English..  Confused

My oldest local guide is a 1978 'Broads Book' by Link House, which gives the AHW clearance as 6 feet 10 inches.

I wondered if this pattern continued back through the ages....  Smile

BarnacleBill
Mar-05-2005 @ 2:42 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 898
Joined: Sep 2004
BarnacleBill
          

Add To Ignore List
It's an interesting question, that.  As Woodwose says, there are measurements that prove water levels in the upper Thurne have shown a rising trend over recent years.  The change in water levels in the upper rivers over the longer term is down to more than rising sea levels though.

The broads would have looked very, very different when Potter bridge was built - there have been some fairly major changes in the course of broads rivers over the centuries, extreme examples being the reversal of the direction of flow of the Thurne and the silting up of the Yare/Bure estuaries, both occurring at some point since Roman times (but obviously pre-dating Potter bridge).

On the one hand, river flow restriction through course changes and silting will reduce the effect of the flood tide on the upper rivers, but on the other, it's harder for freshwater run-off from rainfall to drain away to the sea.  This is compounded by drainage from the marshes having become more effective with the advent of diesel and electric powered pumping stations in the last century - after periods of high rainfall, the river has to carry the water that previously would have sat on the marshes.

I'd be interested to know whether anyone has made, or seen, a detailed study of this subject?

thiswan
Mar-05-2005 @ 10:02 PM                           Permalink
reply
edit
profile
send p.m.
Fens Fatale
Posts: 35
Joined: Feb 2005
thiswan
          

Add To Ignore List
So.....if a massive pump with a pipe out to sea at say the Horsey Mere area, would that help save flooding and more to the point get me under Potter Bridge Wink

now about Wroxham and Beccles bridges Smile .....

Kind Regards, thiswan.

billmaxted
Mar-06-2005 @ 2:13 PM                           Permalink
reply
edit
profile
send p.m.
Mudplug Juggler
Posts: 9005
Joined: Mar 2005
billmaxted
          

Add To Ignore List
Fill your water tanks, don't empty your loo tank and purchase a couple of crates of Woodforde's best, 24 norfolk lads on board sipping their way through should see you clear. Full chat into the entrance and ease off as you pull out, digs nose in, then sinks tail and keeps you clear of the side walls. Personally don't think there has been much change since 1963 but the strength of the beer these days might make near misses more noticable.  

jill_R
Mar-06-2005 @ 2:27 PM                           Permalink
reply
edit
profile
send p.m.
Forum Regular
Posts: 587
Joined: Feb 2005
jill_R
          

Add To Ignore List
our mooring (nowich) used to flood several times a year in the 90s but rarely floods now. I wonder if the levels have been managed to ensure the new riverside complex dose not flood?

Hi Jill
if any of you are wondering why this message has been doing a vanishing act i have been playing about with the delete thingy.

This message was edited by roya on 3-6-05 @ 3:47 PM

PAGE: 1 2

Home Photo Gallery Days Afloat Contact Us
Chat Room Downloads Norfolk Broads @ Amazon Make My Logo
Shops & Businesses Members Gear Norfolk Broads @ EBay Holiday Calendar
Pub Guide Tide Tables SOS List Popular Threads
2017 Calendar Contest Make A Donation Links Hireboat Info
Norfolk Broads @ CafePress FAQ Broads Quiz Forum Events
Advertise With Us Forum Shop Boating Bits Stickys and FAQs Boating Bits Hirecraft List

 

 

 



Copyright © 2005 Y2KInternet, All Rights Reserved.