Case Study — Moreton-in-Marsh, United Kingdom
National Highways
Test Centre
Independent Validation for Strategic Road Networks
Project Overview
The National Highways Test Centre validation project represents a critical milestone in establishing the Rosehill Drainage System's credentials for strategic road network applications. This comprehensive testing programme provided independent verification of system performance under extreme conditions.
Through rigorous full-scale testing protocols, the project demonstrated the system's capacity to meet and exceed the demanding requirements of major highway infrastructure projects, validating both hydraulic performance and structural resilience.
Testing Requirements
- Extreme rainfall simulation to validate capacity under peak flow conditions
- Structural loading tests to confirm resilience under heavy traffic loads
- Long-term durability assessment for strategic infrastructure requirements
- Data for CG 501 / MCHW 500 Series extrapolation across storm return periods
- Independent trial at the National Highways Moreton-in-Marsh Test Centre
Testing Protocol
- Full-scale test installation replicating real-world highway conditions
- Simulated extreme rainfall events exceeding design storm intensities
- Comprehensive flow measurement validating hydraulic performance claims
- Structural stress analysis under representative loading scenarios
- Extended monitoring period to assess performance consistency
in under 22 minutes
tested — all passed
flooding or damage
Series data basis
Trial Results
- Full-scale trial: a 60 m modular filter drain (one trough, three full-height stackers) tested along a 4-lane carriageway into a standard Type 7 chamber
- Every storm return passed: zero surcharging, flooding or damage across return periods up to 1 in 1000+
- Flood test: 11,000 litres discharged through a single 1 m entry point in under 22 minutes
- Capacity headroom: the maximum tested rate was limited by the water-tanker pump, not by the drain
- Data basis: results provided for extrapolation into National Highways CG 501 and MCHW 500 Series calculations
The Rosehill Drainage System completed a full-scale performance trial at the National Highways Moreton-in-Marsh Test Centre, passing every simulated storm return period without surcharge, flooding or damage — providing an independent evidence base for its use in highway drainage.
Testing & Installation Images
Project Details
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