Flood Risk Assessment in Ware

Ware grew up on the River Lea, and the river still shapes how the town needs to think about flood risk today. From the 140 malthouses that once lined its wharves to the housing and employment sites now coming forward north and east of the town, almost every significant development in Ware sits somewhere between the Lea, its tributary the River Ash, and the chalk aquifer beneath the streets. We prepare flood risk assessments in Ware for planning, property purchase, mortgage and insurance, and BREEAM, alongside sequential and exception tests and surface-water drainage strategies (SuDS), each built around the town's real hydrology rather than a generic template.

Speak to one of our experienced flood risk consultants on 01293 214444 or enquiries@unda.co.uk for a free, no-obligation quote.

Ware is named in the East Hertfordshire Strategic Flood Risk Assessment as the settlement with the greatest recorded number of groundwater flooding incidents in the district, on top of its long-standing fluvial exposure to the River Lea.

Do you need a flood risk assessment in Ware?

Most sites in Ware need a flood risk assessment in Ware when they fall within Flood Zone 2 or 3, cover more than one hectare even in Flood Zone 1, sit close to the River Lea, the River Ash or a smaller tributary, or lie in an area with a recorded history of surface water or groundwater flooding. East Hertfordshire District Council, as the local planning authority, and Hertfordshire County Council, as the Lead Local Flood Authority, both expect a site-specific report before granting permission on land that meets any of these triggers, and the same technical groundwork supports a homebuyer or insurance report, a BREEAM assessment, or a drainage strategy for a scheme that never touches the planning system at all.

• Flood Zone 2 or 3 sites. Land within the Environment Agency's mapped fluvial or tidal flood zones along the Lea corridor and its tributaries.
• Sites of 1 hectare or more. Required in any flood zone under the NPPF, regardless of the site's own flood history.
• Sites near a watercourse. Land adjoining or close to the River Lea, the River Ash, or the Hardmead and Stanstead sluices between Hertford and Ware.
• Sites with a groundwater or surface water flooding record. Ware has more recorded groundwater flooding incidents than any other settlement in East Hertfordshire.
• Sites the council or a lender flags directly. Where East Herts, Hertfordshire County Council or a mortgage lender requests a report as a condition of approval or lending.

Understanding flood risk in Ware

Ware's flood risk comes from three main sources working together rather than one obvious hazard. The River Lea runs along the southern edge of the historic town centre, joined by the smaller River Ash from the north; the underlying chalk geology drives some of the highest groundwater flooding incidence recorded anywhere in East Hertfordshire; and low-lying land near both watercourses carries a genuine surface water risk in intense rainfall. A flood risk assessment in Ware has to look at all three, because a site that reads as low risk on the river flood map can still fail on groundwater or surface water grounds.

The Environment Agency's flood warning service reflects this fluvial exposure directly: Ware sits within the "River Lee at Hertford and Ware" flood warning area (which also covers Stanstead Abbotts) and the wider "River Lee at Hertford" flood alert area, which stretches from Lemsford and Hatfield through to Ware and Stanstead Abbotts. The East Hertfordshire Strategic Flood Risk Assessment estimates around 31 properties across Ware, Great Amwell and St Margarets are at risk of fluvial flooding during the 1% annual exceedance probability event, under the Environment Agency's Lower Lee Flood Risk Management Strategy.

Ware's flood history

Ware has a documented history of serious flooding, and the response to it still shapes how the town manages flood risk today. The River Lea broke its banks in 1947, causing severe flooding across the town, and work began that year on the Lee Flood Relief Channel to prevent a repeat; the channel became fully operational in 1976. A further flood alleviation scheme followed in 1974, dredging the river, reinforcing the banks and constructing by-pass sluices at both Ware and Hardmead. Since the relief channel was completed, the Lea Valley has not seen a major flood event, though the river system came close to full capacity on three occasions: in 1987, 1993 and 2000.

• 1947. The River Lea broke its banks and flooded Ware; construction of the Lee Flood Relief Channel began the same year.
• 1974. A Thames Water Authority flood alleviation scheme dredged the river and added the Ware and Hardmead by-pass sluices.
• 1976. The Lee Flood Relief Channel became fully operational, and no major flood event has affected the Lea Valley since.
• 1987, 1993 and 2000. The river system came close to full capacity on each occasion without a repeat of the 1947 flood.

The East Hertfordshire Strategic Flood Risk Assessment also records no incidents of canal overtopping along the Lea Navigation Channel through Ware — a channel with particular local resonance, since it was this stretch of the river that carried malt out to London for two centuries and made Ware the premier malting town in England.

Planning policy and drainage requirements in Ware

Two authorities govern flood risk decisions on a Ware site. East Hertfordshire District Council is the local planning authority, determining applications against the adopted East Herts District Plan 2018 and the made Ware Neighbourhood Plan 2021–2033. Hertfordshire County Council is the Lead Local Flood Authority, responsible for approving surface water drainage strategies under Policy WAT5 and for the wider Local Flood Risk Management Strategy for the county. Both are live areas of policy in Ware right now: East Herts is running a New Local Plan Scoping Consultation, open for comment through to 10 July 2026, which will feed into the district's next generation of flood risk and site allocation policy.

• East Herts District Plan 2018. Sets planning policy for the district to 2033, including land north and east of Ware taken out of the Green Belt for allocation.
• Ware Neighbourhood Plan 2021–2033. Made following a 2023 referendum, and now forms part of the statutory development plan for the town.
• New Local Plan Scoping Consultation. Open now, closing 10 July 2026, ahead of a new Local Plan for East Hertfordshire.
• Hertfordshire LLFA SuDS policy. Requires sustainable drainage to be prioritised on qualifying developments under Policy WAT5.

Development and growth in Ware

Growth in Ware is concentrated on land north and east of the town, under the WARE2 Masterplanning Framework approved by East Herts Council in October 2019. The Strategic Flood Risk Assessment specifically flags the North and East of Ware allocation as one of several East Hertfordshire sites with surface water flood risk issues, recommending detailed hydraulic modelling to confirm the risk before development proceeds — exactly the kind of technical work a flood risk assessment in Ware and an accompanying drainage strategy are built to provide.

Ware's older building stock adds a second, quieter strand of development activity: the conversion and redevelopment of former maltings and riverside industrial buildings close to the Lea, many of which sit on land shaped by centuries of barge traffic and river-level management. Sites like these routinely combine heritage constraints with genuine fluvial and groundwater exposure, and often need a flood risk assessment in Ware alongside listed building or conservation area consent.

How Unda helps in Ware

We have extensive experience of flooding and planning policy across the River Lea corridor, and we know how East Herts and Hertfordshire County Council expect fluvial, groundwater and surface water risk to be evidenced on a Ware site. The scale of Ware's groundwater flooding record is not widely appreciated outside the district's own technical evidence base, which is exactly why it needs a specialist read rather than a desk-based template.

Our flood risk consultants bring that local evidence base together with site-specific survey and modelling, so a report for a Ware site holds up to scrutiny from East Herts, Hertfordshire County Council and the Environment Agency alike.

Flood risk assessments for every situation in Ware

We prepare flood risk assessments in Ware for planning, property purchase, mortgage and insurance, and BREEAM, alongside sequential and exception tests and surface-water drainage strategies (SuDS). A flood risk assessment, a sequential or exception test and a drainage strategy are three distinct 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. Site-specific evidence to satisfy East Herts and the NPPF on a Ware application.
• Flood risk survey for property purchase. For buyers and conveyancers wanting clarity beyond a standard search.
• Flood risk assessment for insurance. Evidence for brokers and underwriters where cover has been restricted or premiums have risen.
• Flood risk assessment for BREEAM. Structured around BREEAM Pol 03 for certification on commercial schemes.
• Sequential and exception test. Locational justification where a Ware site sits in a higher flood risk zone.
• Surface-water drainage strategy (SuDS). Meeting Hertfordshire County Council's Policy WAT5 requirements as LLFA.
• Groundwater flood risk assessment. A dedicated read of the chalk aquifer risk that makes Ware distinctive.
• Flood modelling. Detailed hydraulic modelling of the kind the SFRA recommends for the North and East of Ware allocation.

Drainage work in Ware often continues beyond the initial strategy: our preliminary drainage design service flags infiltration and runoff issues early, and our discharge of drainage planning conditions service takes a scheme through to detailed approval once permission is granted.

Free tools to check your flood risk in Ware

Before commissioning a full flood risk assessment in Ware, these free Unda tools give a useful first read of a site.

• Flood Risk Map. A postcode-based screening check of flood risk anywhere in England, including Ware.
• Live River Levels Map. Real-time river level monitoring, useful for tracking the Lea and Ash during heavy rainfall.
• Geology & Ground Conditions Checker. A first indication of infiltration potential given Ware's chalk geology.
• Drainage Calculators. Tools to support early-stage SuDS and runoff calculations.
• BRE 365 Infiltration Rate Calculator. Supports soakaway design testing where infiltration drainage is being considered.

Further reading: our guides to groundwater flooding, groundwater flood risk maps and groundwater in planning applications go into more depth on the risk source that sets Ware apart from many of its Hertfordshire neighbours, while our explainer on the four pillars of SuDS and our guide to BRE365 infiltration testing cover the drainage side. If you are still establishing whether your site needs a report at all, our guide on when you need a flood risk assessment is a good starting point, and our piece on riparian ownership is relevant for any site with a boundary on the Lea or Ash.

Local flood risk management and emergency contacts in Ware

If you need to report flooding, check current warnings, or understand who is responsible for what in Ware, these are the relevant bodies.

Frequently asked questions about flood risk assessments in Ware