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  • Property development
  • Construction - houses & commercial
  • Planning & legal
  • Architecture & design
  • Civil & infrastructure
  • Property development
  • Construction - houses & commercial
  • Planning & legal
  • Architecture & design
  • Civil & infrastructure
  • Property development
  • Construction - houses & commercial
  • Planning & legal
  • Architecture & design
  • Civil & infrastructure

Underground Utilities Mapping

Powers & Tiltman provide comprehensive underground utiity surveys showing position type and depth of service networks in relation to design features such as building foundations or proposed service routes.

Utility Detection Surveys are essential on any design and construction project as a way of communicating the constraints of the underground services environment, ensuring the health and safety of contractors and the public, minimising utility damage, reducing CDM costs and keeping the project on track and within budget.

Underground Utilities Trace for a restaurant in Spring Gardens, Manchester

Underground services are best described as pipes, cables and equipment associated with the electricity, gas, water (including piped sewerage) and telecommunications industries. By understanding what is underground, designers and developers are then equipped with the data to make informed decisions regarding the position of new utilities and what to do with the existing, possibly densely packed, cabling and pipes, especially in brown and green field sites.

“(Current) Plans can give an indication of the location, configuration and number of underground services at a particular site, and should help subsequent tracing by locating devices. However, they are rarely drawn accurately to scale and, even if they claim to be, they should not be relied upon to obtain distances” - HSE – Avoiding Danger From Underground Services (HSG 47)

It is not enough to assume that current buried asset plans are up to date and show correctly what is underground as they are often inaccurate and in many cases incomplete. Further still, digging trial pits or slit trenches to reveal or confirm what’s underground can be costly and time consuming. Contact us to discuss your underground mapping requirements.

Pipes

Benefits of a Full Utility Survey

As well as providing comprehensive underground utility surveys our surveyors are also aware of other important factors such as reinstatement scars indicating where previous street works have been carried out, highlighting significant changes in previous underground services implementation.

This information gives our clients the advantage when considering the Construction (Design and Management) Regulations 2015 and Health & Safety requirements and by doing this they benefit from:

  • Reduced time spent on site
  • Reduced risk of harm from service strikes
  • Knowing which type of service is located
  • Lower project costs
  • A better understanding for service adoptions and diversions
  • Less time spent with line and highways adoptions
  • Reduction in the disruption to pedestrians and road / rail users

Our utility surveys comply with Level 4 TSA Utility Survey Guidance Notes and PAS 128. Bespoke specifications can be developed to meet individual client's requirements thus lowering unnecessary time and costs spent on site. To discuss your requirements in more depth contact us.

CCTV Survey Reports

Our underground utility surveys are not pipe condition surveys, however the use of CCTV in a gravity drainage system or any accessible pipes or ducts, as an addition to the underground utility survey, can provide useful information on the service and structural condition of pipes.

We can carry out a CCTV condition survey whilst completing your underground utilities trace, providing not just a report but CCTV video footage of the pipe with the aid of 360° camera technology, delivering a high-quality level of visual data and an excellent way of seeing the condition of underground drainage or sewerage systems.

Robust, Reliable Sub Surface Surveys

We employ a "Best Approach" management system, pulling together all available disciplines and technologies to produce as near a complete underground picture of a site as possible.

  • Collation and on site analysis of statutory record / guide drawings
  • Deployment of electromagnetic devices to locate and map metallic buried services.
  • To locate and map accessible sewers and ducts
  • Deploying Ground Probing Radar to establish position and depth of non-metallic, fibre optic and plastic buried services
  • Production of a topographical base plan
  • Final deliverable being an accurate scaled colour co-ordinated presentation of the site as it exists
  • Production of a survey report outlining confidence levels

We combine state of the art technology with our extensive knowledge to establish the accurate positions and depths of buried services that exist beneath a site which can then be clearly marked on one of our topographic surveys.

A chat with one of our experts will only take a few minutes but could prove an enormous cost saving in the long run.

Robust Surveys work in compliance with Level 6 TSA Utility Survey Guidance Notes Survey category type A – PAS 128

Underground Utility Survey Frequently Asked Questions

(1) What equipment is used for underground utilities mapping?

We use EML + GPR technology:

EML (Electromagnetic Locator) technology traces live services or known services that a low voltage electric pulse can be passed along and traced from the surface.

Once all known services have been traced using EML, GPR (Ground Penetration Radar) is then used to scan the site for any services which are unable to be located by EML e.g. plastic pipes or unknown services.

(2) What is the depth range of buried services?

The depth of buried services can be determined using an Electromagnetic Locator (EML) or a Ground Penetrating Radar (GPR) survey. Locating the depth of buried services depends on the size of the pipe used and its location underground. The American Society of Civil Engineers in their ‘Standard Guidance for the collection and depiction of existing subsurface utility data’ has a useful rule of thumb for GPR which in, metric values, can be summarised as:

‘In good ground conditions and within the depth range of two metres the ability to detect a utility will reduce in diameter by 1mm for each 10mm of depth. i.e. a 200mm pipe can be detected at 2m and a 50mm pipe at 0.5m but a 25mm plastic water service pipe to a house cannot be detected at 1.2m with radar’.

(3) Do underground utilities surveys detect everything?

No. Underground utilities surveyors will trace most services on site using a combination of service records, EML and GPR. The majority of services will be traced. There are limitations however. Services which are too deep or too small for GPR to get a clear reading and are not shown on statutory record plans may not be detected.

(4) How do you create the most robust and accurate underground utility surveys?

We use a best practice management system, pulling together all available disciplines and technologies to produce as near a complete picture of a site as is possible. This would include:

  • Collation and on-site analysis of statutory record / guide drawing
  • Locate and map accessible sewers and ducts picked up on the site visit
  • Deployment of Electromagnetic Locator devices to map metallic buried services.
  • Deploying Ground Probing Radar to establish position and depth of non-metallic, fibre optic and plastic buried services.
  • Production of a topographical base plan, where required.
  • An accurate scaled colour co-ordinated presentation of the site as it exists
  • Production of a survey report outlining confidence levels

We combine state of the art technology with our extensive knowledge to establish the accurate positions and depths of buried services that exist beneath a site which can then be clearly marked on one of our topographic surveys.

 

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Redrow Integra HSW Solicitors Harris Partnership Bellway blueoakes Bowsall Brock Carmichael Cruden E3C Green Frog "Legat Mace Manchester Science Partnership McCormick Miller Homes morbaine Muller Muse New City Vision Strategic Land Group Sutcliffe Logo Taylor Wimpey TDS Total Piling Towerhouse Caulmert dcce_logo_web Orthios_Logo Clearground RSK_logo Edison Developments HA - Surfacing ELM logo HR - JONES HOMES Sign Board