NHRR Source Protection Zone
Groundwater Protection & Drainage Strategy in SPZ
Location: Lincolnshire
Project: North Hykeham Relief Road – Catchment 10
Focus: Groundwater Protection in SPZ2
The Challenge
A section of the NHRR falls within a Source Protection Zone 2 (SPZ2), where infiltration drainage posed a risk to public water supplies. The goal was to allow sustainable drainage without compromising groundwater quality.
Our Approach
Courous Ltd developed a multi-layered pollution mitigation strategy aligned with HEWRAT, LA113, and CIRIA SuDS guidance.
Key Measures:
🌀 Vortex separators for removing hydrocarbons and metals
🌱 Sediment forebay and grass channels for natural filtration
🛑 Penstock valves for emergency shut-off during spills
📊 HEWRAT and spillage risk assessments demonstrating compliance
🧪 Ground investigation confirming low permeability and no groundwater within 10m
Outcome
✅ Infiltration drainage approved within SPZ2
✅ Pollution risks mitigated to “acceptably low” levels
✅ Fully compliant with EA and groundwater protection policies
✅ Sustainable, maintainable, and resilient design
This project highlights Courous Ltd’s capability to deliver compliant drainage solutions in sensitive groundwater zones, balancing environmental protection with practical design.
Get In Touch
Courous, Suite 7a, The Globe Centre, Accrington, BB5 0RE
Find us on LinkedIn