Horsham, England climate resilience brief

Priority hazards

• Surface-water floodingmedium confidence
• River and ordinary-watercourse floodingmedium confidence
• Heat-health stress in older housingmedium confidence

Exposure and vulnerability

Assets

Horsham railway station approaches, A24 and A264 access corridors, River Arun culverts and footbridges, Horsham District Council public buildings, Southern Water and power utility nodes

Use current local exposure, public health, infrastructure, and social vulnerability data before acting.

Adaptation options

• Sustainable drainage retrofits on priority streetsUses West Sussex LLFA mapping, highway renewal windows and adoptable SuDS standards.Cost: medium-high · Benefit: reduced flood depth, safer access and less sewer surcharge
• Property flood resilience for recurrent-risk blocksProperty surveys confirm thresholds, airbricks, doors and recovery needs before installation.Cost: medium · Benefit: faster recovery and lower damage for shallow floods
• Cool public buildings and heat-health outreachPrioritises buildings already in the local government asset plan with high vulnerable-user footfall.Cost: low-medium · Benefit: reduced heat illness and usable refuge during heat-health alerts

Cost and benefit ranges are planning estimates, not procurement-ready budgets.

Implementation timeline

Short term

• Map Horsham flood-callouts, blocked gullies and heat-vulnerable facilities with West Sussex County Council.
• Audit Horsham District Council buildings for overheating, backup power and safe access during heavy rain.

Mid term

• Build SuDS pilots on priority Horsham streets and car parks coordinated with highway resurfacing.
• Launch property flood resilience offers for River Arun and surface-water risk blocks.

Long term

• Embed climate allowances into Horsham local plan sites, drainage approvals and council capital renewals.
• Scale cool hubs and blue-green corridors linking Horsham centre, schools and older-resident areas.

Funding windows

• Environment Agency Flood and Coastal Erosion Risk Management Grant-in-Aidnational government grant · Match: often requires partnership contributions; confirm current calculator · Award: $100k-$10M+ depending on benefit-cost and eligible outcomes · O&M: limited; mainly capital and enabling work
• West Sussex County Council / Horsham District Council capital programme and Community Infrastructure Levylocal public capital / developer contribution · Match: locally determined · Award: $50k-$3M project packages · O&M: sometimes for council-owned assets; verify budget treatment
• UK Shared Prosperity Fund or successor place-based fundsplace-based economic and community resilience funding · Match: varies by call · Award: $25k-$1M local packages · O&M: some revenue/community delivery may be eligible; verify live guidance

Decision triggers

• If Met Office warning plus forecast rainfall likely to exceed local surface-water thresholds over HorshamThen Clear priority gullies, stage highways crews at A24/A264 pinch points, message schools and log impacts for LLFA funding evidence.
• If Environment Agency river alert or local gauge trend indicates River Arun/tributary overtopping riskThen Notify riverside properties, inspect culverts and bridges, deploy temporary barriers for listed council assets and reopen routes only after safety checks.
• If UKHSA amber or red heat-health alert is issued for South East EnglandThen Open named Horsham cool rooms, check care settings and older residents, extend library/community-centre hours and monitor indoor temperatures.

Evidence and sources

• Surface-water flooding is a priority for Horsham streets and access routes.expert inference; verify with West Sussex County Council Lead Local Flood Authority records and Environment Agency surface water flood maps
• River flooding is locally relevant but should focus on River Arun/ordinary watercourses, not coastal surge.expert inference; verify with Environment Agency flood map for planning and local watercourse asset data
• Heat-health measures are justified for older housing and public facilities in Horsham.expert inference; verify with UKHSA Heat-Health Alerts, Met Office projections and Horsham District Council asset audits

Governance and verification

Steps

• Horsham District Council should name a resilience lead and merge asset, planning and emergency-risk registers.
• West Sussex County Council LLFA should validate priority surface-water sites and agree maintenance triggers with highways teams.
• Horsham District Council finance team should package SuDS, property resilience and cool hubs into a 3-year funded pipeline.

Partners

Horsham District Council planning, emergency planning and property teams, West Sussex County Council as Lead Local Flood Authority and public health partner, Environment Agency area flood-risk team for River Arun and FCERM bids, Southern Water, Network Rail and local bus/highway operators serving Horsham

Priority sites

Horsham railway station approaches and nearby surface-water flow paths tied to commuter disruption, A24/A264 junctions, under-drained streets and bus routes exposed to intense rainfall, River Arun tributary corridors, culverts and riverside ground-floor properties exposed to fluvial flooding

Equity approach

Target grants and outreach through Horsham community facilities before requiring household co-payments.

Metrics

number of Horsham properties with flood resilience installed, hectares or streets treated with SuDS, cool-hub capacity within 15 minutes of vulnerable residents, hours of transport disruption after heavy rain