Commercial Surveys:

  • Public Sewer Surveys
  • Highway Drainage
  • Adoption Surveys
  • Asset Management Surveys
  • Repeat Blockage Surveys
  • Drainage Area Surveys
  • Infiltration Surveys
  • Sewer Diversions
  • Chimney Inspection Surveys
  • Culvert and Tunnel Surveys

Domestic Surveys:

  • Private Sewer Surveys
  • Build Over Surveys
  • House Purchasing Surveys
  • Sewer Diversions
  • Repeat Blockage Surveys

Oneline use the most respected surveying equipment on the market. Our surveying vehicles are made bespoke to our requirements, and are therefore carefully designed in order to provide our customers with the best service in the industry. 

All of our units have fully integrated offices so coding can be completed on site, and any structural issues can be investigated further. Survey reports are coded using the authority approved Wincan software, and are sent out in DVD format. Our surveyors are trained to the highest standards and all reports are produced in accordance with the WRc Manual of Sewer Classification.

CCTV rig capabilities :

  • 350 metre surveying capability with one set up
  • Pipe sizes from 75mm upwards
  • Pan, tilt and zoom surveys from 150mm upwards
  • “On screen” inclination reports showing incline/decline in pipe gradients
  • Steerable crawler units for tight access points and bends
  • Automatic height adjustments for increase/decrease in pipe sizes during surveying
  • Laser pointers for defect measurements
  • 150 metre link cable for remote access work
  • On board broadband so that reports can be sent back to our clients from site or to receive instruction on urgent work
  • On board printing and burning of DVDs
  • Full compliance with Street Works Qualifications Register
  • Highway maintenance vehicle signage to allow work on public highways.



  • Manhole Surveys
  • Conventional Levelling
  • Specialised Asset Surveys e.g. CSO's
  • GPS Levelling/Locations
  • Tracing and Mapping of Private and Public Drains and Sewers
  • Impermeable and Drainage Area Studies

Sewer mapping is the process of collecting information on existing sewer and drainage systems. This information is critical to design engineers who may be looking to upgrade existing systems or to solve flooding problems or pollutions of watercourses. The data collected can then be used to build hydraulic models which are able to simulate the flow rate, storage capacity and discharge of existing systems to determine if the system is overloaded.

Problems detected such as blockages, structural defects, damaged or inoperative equipment, will be recorded. This enables design engineers to quickly organise work to remedy the defects, which could be contributing to the hydraulic problems.