Surveys
Our Drainage Survey Services
Our drainage survey service includes:
Site drainage inspections
Drainage network reviews
Manhole inspections
Drainage connectivity checks
Outfall location assessments
Surface and foul reviews
CCTV survey coordination
Drainage condition assessments
Survey drawing reviews
Technical recommendations
Each survey is used to build a clear understanding of the existing drainage system and identify constraints, defects or opportunities for improvement.
Designed to Current Guidance
Our drainage survey work is reviewed and interpreted in accordance with current UK drainage guidance and industry standards, including:
- Building Regulations
- Water company requirements
- Sewerage sector guidance
- CIRIA SuDS Manual (C753)
- Local Authority and LLFA guidance
- British Standards (BS EN)
- DMRB where highway drainage is involved
- Health and safety and confined space best practice
We ensure survey findings are presented clearly and used to support accurate drainage design, planning submissions and construction decisions.
Suitable For
We provide drainage survey support for:
- Residential developments
- Commercial developments
- Industrial sites
- Highways and infrastructure projects
- Schools and public buildings
- Brownfield redevelopment sites
- Existing properties and extensions
- Planning applications and drainage investigations
Our survey support helps clients understand existing drainage assets before committing to design, construction or remediation works.
Why Choose Courous?
Our engineers use drainage survey information to provide practical, technically informed advice for planning, design and construction. By identifying existing drainage routes, defects, restrictions and connection points early, we help reduce uncertainty, avoid design conflicts and develop drainage solutions that are accurate, compliant and buildable.
Topographical Surveys
We provide site level and feature surveys showing buildings, boundaries, manholes, and ground levels. These are essential for drainage layouts, SuDS design, and cut and fill planning.
Drainage Surveys
We can arrange full drainage surveys using CCTV, jetting, and sonde tracing. These are useful when you need to confirm existing drainage condition, connections, or locations before starting new works.
Infiltration Testing
For SuDS and soakaway design, we arrange BRE 365 soakaway testing. We provide clear results including infiltration rates and water table levels, ready to support your drainage strategy.
Utility Mapping
We offer utility surveys including GPR and cable tracing to map underground services. This helps avoid delays on site and supports better drainage routing at design stage.
Manhole & Drain Mapping
We lift covers, record levels, and check directions to produce accurate drain maps. This is often needed when you are looking to connect to an existing sewer or prove a discharge route.
How It Works
We handle the coordination, specification, and technical review of all survey work—ensuring the data is collected in the right format, to the right standards, and with clear interpretation ready for design use.
Whether you need a standalone survey or a full package integrated with our drainage and SuDS design services, we’ll make sure it’s delivered on time and on point.