Sefton Metropolitan Borough Council v United Utilities Water Ltd

Whether a natural watercourse has become a statutory sewer is a question of fact and degree. Mere discharge of sewage, and a fortiori pure surface water, is insufficient; a substantial change in character is required. A purpose-built sewer remains a sewer even if it carries water from other sources. The statutory basis of drainage works must be determined from the scheme’s purpose and the surrounding evidence. Contemporaneous minutes and negotiations may outweigh later or mistaken descriptions in a deed. The evidence here supported the conclusion that culverting a natural brook was undertaken under Part XI of the Public Health Act 1936, rather than under its Part II sewerage provisions.

Sefton appealed from a decision of His Honour Judge Howarth in the High Court, Chancery Division. The judge held Sefton liable for West Lancashire Rural District Council’s obligation under a 1961 deed to share the cost of repairing a tunnel carrying Maghull Brook beneath the Leeds and Liverpool Canal.

The appeal concerned whether West Lancashire had carried out the culverting works under Part II sewerage powers or Part XI watercourse powers of the Public Health Act 1936, and whether the deed’s description of the culvert as a sewer controlled that issue. Sefton abandoned the separate challenge based on the culvert having become a public sewer, making the question of formal adoption academic.

Lord Justice Robert Walker delivered the leading judgment, with Lord Justices Rix and Henry agreeing. The appeal was dismissed. The court upheld the judge’s conclusion that Sefton was liable under the 1961 deed.

1. Statutory framework. Part II of the Public Health Act 1936 concerned sewerage and public sewers. Part XI dealt with watercourses, ditches and ponds. Section 262(1) expressly contemplated replacing a watercourse with a pipe, drain or culvert, while section 265 enabled the authority to contribute to or execute such works by agreement.
2. Identification of the statutory power. The court accepted the factual distinction between two schemes: a relief sewer carrying foul sewage to expanded treatment works, and the separate culverting of Maghull Brook as a surface-water drainage scheme. The contemporaneous Health Committee minutes, including negotiations and agreements with developers, supported the inference that the culverting works were undertaken under Part XI and that West Lancashire entered into section 265 arrangements. The references to section 262 and section 265 were imperfect but the appellant’s contrary construction was over-engineered.
3. Effect of the deed and other descriptions. The 1961 deed and some minutes referred to the culvert as a relief sewer or sewer. Those descriptions were confused and mistaken in context. They did not outweigh the evidence of the scheme’s purpose, the separate canal crossing for the true relief sewer, and the authority’s conduct. Other features, including the buried pipe, manholes, loan sanction and some straightening of the brook, were neutral.
4. Sewer status. The court noted the authorities’ fact-and-degree approach. A natural watercourse requires more than the mere discharge of sewage, and a fortiori pure surface water, before becoming a statutory sewer; a purpose-built sewer does not lose that status merely because it carries water from other sources. This discussion was academic because the relevant ground of appeal had been abandoned.
5. Order. The appeal was dismissed. Sefton was ordered to pay costs summarily assessed at £19,795 within 28 days. Permission to appeal to the House of Lords was refused.

• Court of Appeal (Civil Division) dismissed Sefton’s appeal and upheld the High Court decision: [2001] EWCA Civ 1284.
• High Court of Justice, Chancery Division, His Honour Judge Howarth, held that Sefton was liable under the 1961 deed. No citation for that decision was stated in the judgment.