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Discussion Topic: Ask JP 5
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JP |
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Dear batrabill,
The lower Bure is a well-known ‘dredging hot spot’ – we get a large amount of deposited sediments on the series of bends between Acle and Marina Quays.
We have targeted dredging over the last few years to remove these deposits.
2018/19 – 14,000m3 removed from Lower Bure
2017/18 – 5,000m3 Bure Loop
2017/18 – 5,820m3 removed from lower Bure
2015/16 – 12,500m3 removed from Bure at Stokesby.
This focussed dredging has helped bring the Lower Bure up to river specification and removed many deposits which shallowed bends and also we have removed reed encroachments, giving a better line through bends for craft.
As far as we know this work has not had any significant effect on water levels at Potter Heigham (or higher at Hickling where the EA monitor water levels).
Passage through Potter Heigham (ancient monument) is not just restricted via height of the bridge and water depth, but also width. Water flows at this end of the system are less than the lower Bure, but this is affected by many factors, none of which are dredging related.
Broadland Environmental Services Limited (BESL) has done some modelling on this system and from memory the sheer amount of tidal input coming in at Great Yarmouth is one of the biggest factors in holding water further up in the upper reaches of the River Thurne.
We will check this understanding and re-post once we have specific information from the BESL model.
Regards
John
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annville |
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Why is it that i didn't get a answer to my question from JP.John
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JP |
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Afternoon John,
I have asked for the information and plan to get back to you tomorrow with the answer.
Regards
John
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annville |
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Thankyou i felt left out there for a moment no rush. John
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batrabill |
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John
Quote "We will check this understanding and re-post once we have specific information from the BESL model."
I wonder if you have been able to obtain any useful information on this?
Bill
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annville |
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Dear Mr Paxman I see that CRT have had funding from Defra to install electric posts to enable boaters to have a alternative to running their engines at moorings. Can you not get funding from Defra to do the same for us. John
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VetChugger |
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I suspect he may be busy with University Challenge! Now Mr Packman might be a more suitable target!
Trevor
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JP |
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Good morning batrabill,
As promised we have followed up this matter with Broadland Environmental Services Ltd (BESL) and the company’s hydrological model addresses this issue. This is what it says ...
"Dredging the River Bure
Residents along the River Bure believe that flooding is aggravated by a lack of maintenance of the river channel. They propose that flood levels would be reduced if the river channel was dredged between Bure mouth & Three mile House.
In reality, the bed level near to the Bure mouth is raised and currently prevents extra water (saline water) from entering the system at high tide. If the channel were to be dredged from the mouth of the river, flood levels would in fact become worse.
Dredging the river further upstream from this point would possibly reduce water levels but by such a small amount that the overall effect would be negligible.
Potter Heigham Bridge
Anecdotal evidence suggests that flooding in the River Thurne is exacerbated by the presence of Potter Heigham Bridge.
This is a listed building, therefore no real solution to the problem can be provided. However, the model has been used to investigate this query. The results of the investigation indicate that the water levels on the River Thurne are governed more by water levels on the River Bure than they are by any structures over the river, as the presence OR not of the bridge makes no difference to peak water levels.
Whereas, significantly lowering or raising the River Bure water levels (e.g. through washlands or crest raising) lowers or raises the River Thurne water levels."
Hope that helps.
Regards
John
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JP |
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Morning John,
Thanks for that news. Can you please see if you can find out if this is from the core Defra grant given to CRT or some special allocation. I will try and do the same using my contacts. Certainly if it is from the latter I will do my best to get some funding for this from the Department.
Cheers
John
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JP |
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Morning Trevor,
Thanks for the correction – interestingly they have the same origin.
Cheers
John
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Paladine |
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Just put the words - Islington Defra electric - into a search engine. This is a scheme to lower urban air pollution (supposedly). It is seen by some in the canal boating world as the thin end of the wedge to ‘gentrify’ an area popular with ‘continuous cruisers’ who don’t actually cruise very continuously.
"..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)
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Nov-22-2018 @ 4:17 PM
