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You are here: BAILII >> Databases >> England and Wales Court of Appeal (Civil Division) Decisions >> Weetwood Services Ltd v Ansvar Holdings Ltd [2007] EWCA Civ 736 (02 July 2007) URL: http://www.bailii.org/ew/cases/EWCA/Civ/2007/736.html Cite as: [2007] EWCA Civ 736 |
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COURT OF APPEAL (CIVIL DIVISION)
ON APPEAL FROM MANCHESTER COUNTY COURT
(HIS HONOUR JUDGE ARMITAGE QC)
Strand, London, WC2A 2LL |
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B e f o r e :
LORD JUSTICE SEDLEY
and
LORD JUSTICE MOSES
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WEETWOOD SERVICES LIMITED |
Claimant/ Respondent |
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- and - |
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ANSVAR HOLDINGS LIMITED |
Defendant/ Appellant |
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WordWave International Limited
A Merrill Communications Company
190 Fleet Street, London EC4A 2AG
Tel No: 020 7404 1400 Fax No: 020 7831 8838
Official Shorthand Writers to the Court)
Mr A McGee (instructed by Messrs Dixon Keogh) appeared on behalf of the Respondent.
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Crown Copyright ©
Lord Justice Waller:
"To assess the potential for flooding I confirm that we would:
"Carry out topographic survey of the water course and adjacent floodplain from the weir upstream of the culvert to the railway culvert downstream of the culvert;
"Assess the catchment hydrology to give culvert inflow hydrographs for return periods of 5, 25, 50 and 100 years;
"Build a HEC-RAS model of the watercourse with the culvert in place and with the culvert replaced by an open channel with a bank top width of 10m;
"Run the two models for the various return periods and report on the results, including identifying the route that any overland flows would take and the impact of these on existing and proposed buildings.
"The report will enable a comparison to be made of the potential for flooding with the culvert in place and following its removal."
"The culvert is approximately 72 metres in length and has a total fall of 3.25 metres giving an overall hydraulic gradient of about 1 in 22. The un-surcharged capacity of the culvert in estimating using Colebrook-White formula with friction ks of 0.6mm. The theoretical capacity is 6.6 m3/sec. However this figure is reduced significantly by the hydraulic characteristics of the entry to the pipe and a coefficient between 0.3 and 0.4 might be applicable. This being so, the capacity would be reduced to between 2 and 3.3 m3/second."
Then it has a heading, "Modelling of Watercourse":
"The watercourse from its point of issue south of Roman Road down as far as the railway embankment was first surveyed and then a mathematic model was prepared using a steady state HEC-RAS [v2.2] approach. A second model was also prepared omitting the culvert under the concrete hardstanding to investigate the possible sizing of an open channel if the culvert were to be replaced."
Then it refers to the culvert model being shown in figure 3. The report then reaches certain conclusions and in summary, so far as the culvert is concerned, it reached the conclusion that at certain extreme conditions the culvert would not take the water and would flood. Then it says this in v):
"If the existing culvert is removed then a channel having a 10 metre width across top of banks will accept peak flows. The bank slopes would be a maximum of 1 vertical to 1.5 horizontal. Alternatively one sloping bank could be replaced by a vertical wall to limit the loss of concrete area."
"I now understand that you require confirmation that if the culvert were to be removed it could be replaced by an open watercourse contained within a 10m strip adjacent to the fence along the northern boundary of your site. To be certain of this we will need to produce proposals which would be acceptable to the Environment Agency (without necessarily consulting them). Preparation of these proposals and submission to you will involve some additional work. This is likely to take 6 hours. We would undertake this in accordance with our proposal letter to you dated 9 November 2001 at the rate of £70/hr."
Lord Justice Sedley:
Lord Justice Moses:
Order: Appeal dismissed.