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The Norfolk Broads Forum / General Chat / Great Yarmouth's Third crossing
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Posted By Discussion Topic: Great Yarmouth's Third crossing

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glastron
Apr-11-2022 @ 10:49 AM                           Permalink
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Hi just been looking at the EDP drone footage of the third crossing and was wondering that with the river width being made narrower would it affect the strength of tide flow further upstream and possibly increase the silting up on certain reaches. What are your thoughts on this.

JollyRodger
Apr-11-2022 @ 11:16 AM                           Permalink
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I was told, several years ago by a BA person, that there was at that time no computer modelling on the effect of Yarmouth's harbour in relation to the Broads. Possibly that has not changed. I share the concerns.

Jolly Roger

Cocklegat
Apr-11-2022 @ 12:00 PM                           Permalink
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The Tide flow through the harbour is well understood. The main constraint is the existing Haven bridge. The slight reduction at the new crossing point will have little or no effect. The Harbour needs the existing volume of water in Breydon to supply a fast current on the ebb which, combined with Brush bend prevents the build up of the harbour bar. The shallowest part of the harbour being at the mouth. One problem that will persist is the existing need to keep a navigable channel across Breydon. The channel was originally deepened artificially in response to the development of Lowestoft and Mutford lock which provided a new waterway up to Norwich, Yarmouth in response made Breydon more navigable. Today with all commercial activity ceased, Breydon will in future need to be dredged.

quackers
Apr-11-2022 @ 4:44 PM                           Permalink
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I'm sure you're right about the future need for dredging on Breydon, Cocklegat, although it will be interesting to see to what extent the BA will judge this to be necessary.

Historically, going back to medieval times, problems with maintaining a navigable channel for sea-going vessels at the outfall of the Yare and across Breydon led to the long-established practice at Yarmouth of transshipping goods bound for Norwich onto shallower draught keels. This was extremely lucrative for the good folk of Yarmouth and the inland watermen, but unpopular in Norwich because it added considerably to the cost of their coal and other imports and exports.

It was largely Norwich money which therefore financed the route for sea-going vessels via Mutford lock and the New Cut, compelling the the Port of Yarmouth Commissioners to respond by creating and maintaining a deep channel over Breydon.

Passenger carrying wherries and commercial keels always seemed to have been able to cross Breydon without too much difficulty, although the channel probably shifted about.



Bill Saunders


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