Overview
When planning large-scale residential developments, careful consideration must be given to how new foul water and surface water networks will connect into existing Highways England infrastructure. With thousands of new properties placing increased demand on drainage capacity, developers must ensure compliance, accurate mapping, and robust engineering design to prevent overloading, future maintenance issues or costly delays. Understanding pipe routes, condition, capacity and connectivity before construction begins is essential — enabling informed planning, regulatory approvals and smooth integration of new networks with existing national infrastructure.
Terrain Surveys were appointed to undertake a detailed investigation of the wastewater drainage network serving the proposed new housing development. The survey would provide the developer and engineering consultants with accurate, verifiable drainage data to support planning, modelling and future design work.
Survey
Working in collaboration with the site team and Highways England requirements, our surveyors carried out a detailed CCTV inspection, connectivity mapping and condition assessment of the foul water drainage network positioned adjacent to the development site. Using live line-tracing and precise sonde location equipment, we established the true alignment of the underground pipework, identifying key access points, manholes and connection routes into the wider network.
CCTV inspection was undertaken throughout the system to assess structural condition, identify any defects, and confirm pipe materials, dimensions and flow direction. All chambers were referenced, measured and recorded to support accurate modelling and connection planning. Throughout the survey, our team managed traffic safety exclusion zones and access controls to ensure compliance and minimise disruption.
Results
The survey provided a full and verified record of the wastewater infrastructure, including accurate pipe routing, connectivity plans, chamber locations and condition grading. This data allowed the developer and design engineers to forward-plan system capacity, connection points and upgrade requirements with confidence. The condition report highlighted areas requiring maintenance or remedial work prior to accepting additional flow from the new development — helping avoid risk of future system failure or non-compliance with planning conditions.
With reliable drainage intelligence now in place, the client can continue progressing design approvals, technical submissions and construction sequencing — ensuring the new development integrates smoothly with existing Highways England infrastructure and supports long-term operational resilience.
