utility surveys bristol

Utility Mapping


Underground utility mapping enables the precise locating and positioning of utilities such as water, gas, electric, fibre optics, buried structures, telecommunications and drainage systems. 

Using the latest in cutting edge survey technology, utility surveys are carried out by means Electromagnetic (EM) Detection Methods and Ground Penetrating Radar (GPR) and can also be supported pre-survey with the option of a Desktop Search.

On completion of the site investigation work the survey data is post-processed and then subsequently drawn up by the surveyor. Each survey is completed in AutoCAD and supplied as a DWG file and in PDF format. Where requested at an early stage, utility surveys can be geo-referenced to fit seamlessly with completed topographical surveys (subject to conditions).

In partnership with qualified and experienced utility surveyors (who have many years of experience investigating highways, airfields and service/utility mapping) we work closely with clients to ensure the delivery of effective solutions when faced with the challenges of utilities mapping underground. 

Desktop Searches

Prior to the start of any on-site utility surveying we recommend clients opt for a desktop search as this can provide vital information of the site derived from plans and reports held by statutory bodies within the utility supply and infrastructure industry. For a one-off fixed cost, a desktop search ultimately assists with the accuracy and quality of the survey and may also highlight services in situ that cannot always be located using GPR and EM techniques.

GPR Surveys

Prior to the commencing of any site excavation works it is critical to implement a GPR survey to ascertain what utilities and infrastructure lie beneath the visible surface. Quite simply put a GPR survey ensures safer excavations of a site.

Ground Penetrating Radar (GPR) works by directing pulses of short duration electromagnetic energy downwards into the ground. The pulses of energy are reflected back as a signal from the subterranean area under investigation to an onboard receiver, The receiver detects reflections from material boundaries or embedded features such as rebar’s, services or voids and is able to map these signals into visual data. All survey data can be geo-referenced utilising RTK-GNSS.

Electromagnetic Utility Detection

EM is chiefly used to detect and trace sub-surface utilities that comprise of electrically conductive materials for example cast iron/ steel pipes (used in the delivery of gas or water), copper cables (telecommunications), miscellaneous wiring and pipe-work.

EM detection is operated in two modes: passive mode and active mode. Passive mode is employed to determine those services already maintaining an electrical current and as a result generates its own detectable electro-magnetic field. Active mode requires the use of a transmitter to apply an artificially generated electro-magnetic field to a buried utility service either by the use of direct connection (such as a clamp) or by means of induction from the surface.

Moisture Mapping

Moisture mapping is the process of surveying relative moisture variations below a surface. Using GPR systems moisture mapping can be effective especially when using a technique known as Ohm Mapping in order to establish 2D and 3D information of the conductive material that exists beneath a surface.

Contact Us To Get a Quote

If you wish to discuss any future utility mapping projects in Bristol, Bath, the Southwest or anywhere in the UK call us today on 01454 550067 or you can reach out and email us at office@pinpointmapping.co.uk. Please provide us with a brief outline of the area you require surveyed and we shall respond with a no-obligation quote outlining our time scales and professional fees. 

Alternatively, please use our Contact Form provided below and set out some site details and we shall be in touch shortly to discuss your project.