Where flood risk applies in Manchester
The council's Level 1 Strategic Flood Risk Assessment (June 2026) identifies these as the main areas of river flood risk:
- The Mersey valley: Didsbury and NorthendenMuch of the city's river flood risk comes from the River Mersey through Didsbury and Northenden. It is largely confined to the floodplain, and most of the city's flood defences are embankments and walls along the Mersey.
- The city centre: Medlock and Corn BrookThe River Medlock and Corn Brook bring river flood risk to parts of the city centre. The Medlock and Irk join the Irwell, which runs along the boundary with Salford, in the city centre.
- North Manchester: the River IrkThe River Irk is a source of flood risk in the north of the city, affecting areas of Cheetham Hill and Blackley.
- Rusholme and Moss SidePlatt Brook, Chorlton Brook, Cringle Brook and Gore Brook give rise to Flood Zone 3 in parts of Rusholme and Moss Side.
What Manchester City Council will look for
Manchester City Council applies the national tests in NPPF Chapter 18 and the Planning Practice Guidance, supported by its Strategic Flood Risk Assessment. A Sequential Test submitted with a Manchester application should normally:
- Confirm the flood zone and vulnerabilityUse the current Environment Agency Flood Map for Planning and the NPPF Annex F vulnerability class for the proposed use.
- Justify the area of searchNational policy says the area of search should reflect the catchment for the type of development and the need it serves. Manchester is a compact city authority, so the Manchester City Council area is often the starting point for housing, while a narrower area can suit a scheme serving one neighbourhood.
- Assess the council's own sources of sitesManchester's Strategic Housing Land Availability Assessment (2025), the Medipark and Manchester Airport strategic allocations, and the Brownfield Land Register are the obvious places to start, and omitting them is a common reason for challenge.
- Evidence every discounted siteWhere an alternative is ruled out as unsuitable, too small or not available in a similar timeframe, give the reason and the evidence. Ownership alone is not enough.
- Screen for the Exception TestState whether the Exception Test applies under Annex F Table 3, and if it does, provide it, drawing on the site-specific flood risk assessment.
Manchester-specific pitfalls
- Surface waterThe SFRA describes high surface water risk as prevalent across the densely urban city. The Sequential Test looks at all sources of flooding, so surface water risk to the site and its alternatives matters as well as the flood zone.
- Recent floodingWidespread flooding around New Year 2025, mainly from the Mersey in Didsbury and Northenden, the Irk in Harpurhey and Crumpsall and the Medlock in Deansgate, is recorded in the SFRA. Check whether your site or its alternatives were affected.
- Relying on defencesDefences along the Mersey are relevant to the site-specific flood risk assessment, not the Sequential Test, which uses flood zones as if the defences were not there.
- Housing-led evidence for non-housing usesManchester's land availability evidence is largely housing-focused. For employment, retail or community uses, you may need to add alternative sites from other sources.
Fixed-fee Sequential Tests for Manchester
We have built our Manchester Sequential Test on published Environment Agency and Manchester City Council data. Plot your site on our Manchester Sequential Test page and we'll deliver a submission-ready report within 24 hours of payment for £300. Exception Tests are £450 within 48 hours.
New to the subject? Start with our general guide: what is a flood risk Sequential Test? We also cover other council areas at the same fixed fee. For wider planning help, see planning consultants in Manchester.
Source: City of Manchester Level 1 Strategic Flood Risk Assessment (JBA Consulting, June 2026).
Sequential Test guides for other council areas
Tameside · Wigan · Bristol · Birmingham · Chelmsford · Gateshead · Runnymede · East Riding of Yorkshire · York · Spelthorne · Oxford · Plymouth · Lichfield · Dover · Hull · Medway · Lewes District · Northumberland
Frequently asked questions
Does Manchester City Council require a Sequential Test?
Yes, for most development in Flood Zones 2 and 3, in line with national policy. Some minor development and most changes of use are exempt, and sites allocated in the local plan may not need the test repeated.
What area of search should I use in Manchester?
National policy says the area of search should reflect the catchment for the type of development and the need it serves. Manchester is a compact city authority, so the Manchester City Council area is often the starting point for housing, while a narrower area can suit a scheme serving one neighbourhood. The reason must be explained in the report.
Do flood defences mean I don't need a Sequential Test?
No. Flood zones for the Sequential Test are assessed without defences. Defences are taken into account in the site-specific flood risk assessment and the Exception Test, not the Sequential Test.
How much does a Sequential Test cost in Manchester?
Our fixed fee for a Manchester flood risk Sequential Test or alternatives assessment is £300, delivered within 24 hours of payment. An Exception Test is £450, delivered within 48 hours.
This guide is general information for applications in England and is not advice on your specific project. Requirements differ in Wales, Scotland and Northern Ireland, and every council publishes its own local validation list, so always check the detail with your local planning authority.