Flood Risk Assessment in Hereford

Our team at Unda use years of experience to prepare comprehensive flood risk assessments and drainage strategies for residential and commercial sites across Hereford. A flood risk assessment in Hereford shows your local planning authority that a development will stay safe from flooding for its whole lifetime, without pushing flood risk onto anyone else.

Hereford grew up on the banks of the River Wye, and the river still sets the terms for development across much of the city. We assess every source that matters here — the Wye itself, the River Lugg that joins it just downstream at Mordiford, the Yazor, Widemarsh and Eign Brook that thread surface water through the city centre, and the groundwater held in the valley gravels — then deal directly with the Environment Agency and Herefordshire Council on your behalf. We guide architects, planning consultants, developers, landowners, home buyers and businesses through to a decision, whether the report is needed for planning, a property purchase, mortgage or insurance, BREEAM, or a surface-water drainage strategy.

If you need a quote or want to talk a Hereford site through, contact one of our experienced flood risk consultants on 01293 214444.

Hereford is a city built around a river that has reached its highest level on record within living memory — the Wye hit 6.11 metres at the Old Wye Bridge gauge in February 2020 — so a development here has to be read against the river, the brooks that flood the city centre and the groundwater beneath, or an assessment will not satisfy the Environment Agency and Herefordshire Council.

Flood risk assessment in Hereford at a glance

• The River Wye runs through the heart of the city. Rainfall across the Welsh uplands and the wider catchment arrives as a flood peak at Hereford, so the river that defines the city is also its largest flood source.
• February 2020 set the modern benchmark. The Wye reached 6.11 metres at the Old Wye Bridge gauge in Hereford on 17 February 2020 — its highest recorded level — during the wettest February on record for England.
• Surface water floods the city centre too. The Yazor, Widemarsh and Eign Brook carry runoff straight through Hereford, and the Environment Agency runs a dedicated flood warning area for them.
• Herefordshire Council is your Lead Local Flood Authority. As a unitary authority it handles surface water, groundwater and ordinary watercourses, and it consults on drainage for major development.
• Flood Zone 1 is not a free pass. Since the 2025 Planning Practice Guidance update, surface water and the River Wye phosphate rules can both shape what is needed on a site the Flood Map for Planning shows as low risk.

Check flood risk anywhere in Hereford

Hereford is outlined below. Screen any postcode in and around the city against Environment Agency data for rivers and sea, surface water and the planning flood zones, with a climate outlook to 2125. It is an indicative first pass, not a substitute for a site-specific assessment.

Flood risk in Hereford: the Wye, the Lugg and the city brooks

Hereford sits in a broad bend of the River Wye, which crosses the city from west to east before being joined by the River Lugg a short way downstream at Mordiford. The Wye is a fast-responding river fed by a large upland catchment in mid-Wales, so heavy or prolonged rain far from the city still arrives as a flood peak at Hereford. Around and through the built-up area, the Yazor Brook collects rural runoff and enters the city from the north-west, becoming the Widemarsh Brook above Plough Lane and the Eign Brook below Commercial Road. Groundwater held in the river-terrace gravels adds a slower, less visible source on low-lying ground near the river.

Because the city straddles a large main river and a network of ordinary watercourses, flood risk in Hereford is not uniform — it depends heavily on which part of the city a site sits in, and which source dominates there.

A site-specific flood risk assessment for planning reads the national mapping against measured ground levels and, where the maps are not detailed enough, against hydraulic modelling, so the real risk at a particular Hereford plot is properly understood. Our guide to how accurate flood maps are explains why the national datasets are a starting point rather than the final word for an individual building.

A history of flooding in Hereford

Hereford has flooded from the Wye for as long as records exist, and the river is photographed across the city in the great floods of the early twentieth century. The defining modern event was February 2020, when Storms Ciara, Dennis and Jorge fell on already saturated ground in the wettest February on record for England, and both the Wye and the Lugg reached their highest recorded levels.

• February 2020 — the record flood. The Wye reached 6.11 metres at the Old Wye Bridge gauge in Hereford on 17 February 2020, against a usual range of roughly 0.10 to 3.30 metres.
• 728 premises affected across Herefordshire. The February 2020 floods affected 524 residential properties and 204 businesses countywide, with around 80 roads closed, many for weeks.
• Hampton Bishop on the edge of the city. The flood embankments there protected roughly 150 properties, but the 3 km River Lugg embankment was overtopped when the Lugg reached its highest ever level, and needed major repair afterwards.
• A long documented record. Hereford's riverside meadows and streets were under water in named historic floods including 1912, underlining that the Wye's flood plain has always done its job.

For owners and buyers, this history feeds directly into value and insurance. Our article on whether flood risk affects house prices sets out the evidence, and a flood risk survey for a property purchase turns a worrying search result into a clear picture of the risk to a specific Hereford home.

Planning policy and your Lead Local Flood Authority in Hereford

For a Hereford development, two authorities matter most. The Environment Agency is the statutory consultee for the River Wye and River Lugg as main rivers, while Herefordshire Council as the Lead Local Flood Authority covers surface water, groundwater and ordinary watercourses such as the city brooks, and advises on drainage for major schemes. Both judge a proposal against national policy and the council's own local evidence.

• Strategic Flood Risk Assessment. The council's Herefordshire Strategic Flood Risk Assessment (Level 1, April 2019) maps flood risk across the county and sets the evidence base your site-specific assessment must work with.
• Local Flood Risk Management Strategy. Herefordshire's Local Flood Risk Management Strategy sets out how local flood risk is managed and how to report flooding.
• Local Plan Core Strategy. The adopted Core Strategy (2011–2031) carries Policy SD3 on sustainable water management, which expects development to avoid increasing flood risk and to manage surface water sustainably.
• The River Wye phosphate rules. Most of Hereford drains to the River Wye Special Area of Conservation, where a nutrient-neutrality requirement has applied since 2019 because the river fails its phosphate targets — so foul and surface-water drainage are scrutinised together with flood risk.

The River Wye nutrient position is a genuine constraint on Hereford development: schemes that add overnight accommodation usually have to demonstrate phosphate neutrality before permission can be granted, and the council publishes nutrient management guidance for developers on how to do it. It does not replace flood risk work, but it shapes how surface water and foul drainage are designed on the same site. Where a layout draws on the brooks or relies on infiltration, a clear surface water drainage strategy keeps the Lead Local Flood Authority on side; our note on critical drainage areas explains why even a Flood Zone 1 site can attract this scrutiny.

Development and flood risk assessment in Hereford

Hereford's development pressures sit on top of its flood pattern. The city is regenerating its centre around Edgar Street and the station, expanding on its northern and western edges, and intensifying employment land at Rotherwas beside the Wye — and a large share of these sites touch a flood source. The right report depends entirely on where the site is and what is proposed.

• City-centre regeneration and infill. Sites near the brooks can be in Flood Zone 1 for the river yet still need a surface-water assessment and a robust drainage design before the council is satisfied.
• Riverside and employment land. Development at Rotherwas, Hunderton and the southern riverside often sits in Flood Zone 2 or 3, where finished floor levels, safe access and egress and compensatory storage come into play.
• Conversions and changes of use. Bringing older riverside buildings back into residential use raises the bar, because homes are a more vulnerable use than commercial floorspace.
• Householder extensions. Smaller proposals near the Wye may still need a proportionate assessment where the Flood Map for Planning or an environmental search flags the plot.

Where the national mapping is too coarse for a riverside Hereford site, flood modelling can define levels, depths and flow routes precisely, and a residual risk assessment deals with what happens behind a defence. On constrained sites in Flood Zones 2 and 3 a sequential and exception test may also be required; recent case law such as the Yatton judgment shows how finely those arguments can turn.

How Unda helps with flood risk assessment in Hereford

We are experts on flood risk in Hereford, not a local branch office: our value is translating the city's rivers, brooks and policy into a report the Environment Agency and Herefordshire Council will accept first time. Our flood risk consultants assess every source affecting a site, read the Environment Agency and council data for that specific plot, model flood behaviour where the maps fall short, and design proportionate mitigation — then stay involved to answer objections. A Senior Flood Risk Consultant signs off every report, and we reply to every quote request within 60 minutes.

Unda has prepared more than 5,000 flood risk assessments since 2014, our consultants are CIWEM members and the company is a CIWEM Business Partner. You can read more about Unda, or see how an assessment fits national policy in our NPPF flood risk guidance. Hereford sits within our wider Herefordshire flood risk assessment coverage.

Flood risk assessments for every situation in Hereford

People need a flood risk assessment or a drainage strategy in Hereford for many reasons, and we prepare each to the same standard. A flood risk assessment, a sequential or exception test and a drainage strategy are three different reports. They often travel together in a planning submission, but they answer different questions: is the site safe, should the development be here, and where does the surface water go.

• Flood risk assessment for planning. The core report for a Hereford planning application, demonstrating the scheme is safe for its lifetime and does not increase risk elsewhere — see flood risk assessment for planning.
• Flood risk survey for property purchase. An independent homebuyer flood risk survey for anyone buying near the Wye or a city brook where a search has flagged risk.
• Flood risk assessment for insurance. A property-specific flood risk report for insurance where premiums rise or cover is restricted after a flood event.
• Flood risk assessment for BREEAM. An assessment structured around BREEAM Pol 03 for schemes pursuing certification.
• Sequential and exception tests. Locational justification for higher-risk Hereford sites — the sequential and exception test reports.
• Surface water drainage and SuDS. A sustainable drainage strategy, the detailed discharge of drainage conditions, or an early preliminary drainage design.
• Groundwater and flood modelling. Specialist groundwater flood risk assessment and flood modelling where the river or the gravels demand it.

Drainage design here follows the SuDS hierarchy, and our four pillars of SuDS guide explains the standard the council applies. Where a scheme relies on infiltration, soakaways are tested to BRE Digest 365; riverside owners should also understand their riparian responsibilities for the Wye, the Lugg or a city brook. If you are weighing up whether to prepare your own report, our note on doing your own flood risk assessment is a useful starting point.

Free Hereford flood and drainage tools

Before commissioning a report, you can screen a Hereford site for free. Check a postcode on our flood risk map, watch the Wye and Lugg on the live river levels map, test whether the ground is likely to suit a soakaway with the geology and ground conditions checker, and size drainage with our drainage calculators and BRE 365 infiltration rate calculator.

Hereford flood risk management and emergency contacts

Several bodies manage flood risk around Hereford, depending on the source. In a flood emergency that threatens life, always call 999. The table below sets out who does what and how to reach them.

To plan for the lowest-probability event, the statutory dataset for development is the Environment Agency's Flood Map for Planning, which a flood risk assessment must use rather than the public long-term flood risk service.

Flood risk assessment in Hereford: frequently asked questions