One of the key ways that ground-penetrating radar surveys (GPR surveys) are used is in the construction industry before groundwork is carried out. GPR surveys are used to get an accurate picture of an underground area, making sure what lies beneath the surface is correctly mapped before the building begins. The GPR survey cost is often considerably outweighed by the benefits because GPR surveyors with experience can interpret the results to indicate to construction workers where utility pipes, other objects, and voids exist.
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A GPR survey is non-intrusive, meaning no digging is required to locate items that should be avoided or otherwise need to be taken into account once construction begins. This can prevent costly delays to projects. But what factors affect the price you’ll pay for a GPR survey on your site? Here, we look at this question and offer other relevant information about GPR surveys.
On average, the daily rate for a GPR survey in the UK is between £900 and £1,800. While this may sound like an expensive undertaking, bear in mind that it will be much cheaper than creating boreholes for the same purpose. The added advantages include the fact that GPR is a non-destructive technology, is fast and will give you a far more accurate idea of where obstructions may lie below the ground’s surface.
The average cost of an entire GPR survey service package is between £10,000 and £35,000. However, every project is different, so to get a more precise GPR utility survey cost, you should ask one or more specialist GPR survey companies to quote a price before you commit. There are various factors that can affect the exact amount that a GPR survey will cost you, and we’ll elaborate on them below.
1. Equipment and software needed
The equipment your GPR service provider has invested in and makes available to your project will also have a direct impact on the overall cost of the survey. There’s a wide variety of equipment that can be used in GPR surveying, ranging from fairly basic on-site marker devices to high-end, high-density arrays. Which type of kit is required is dependent on the level of survey you need; which can, in turn, be reflected in the overall cost of the survey you’re planning.
In broad terms, the basic GPR equipment used for any application includes a signal transmitter, a receiver, and an encoder. The signal transmitter sends radar waves underground. When it encounters an object or item that has different properties to the soil around it, the signal will return to the receiver and be recorded by the encoder.
Alongside the physical equipment used to gather the raw data, a GPR surveyor will then use sophisticated software to interpret the results and turn that raw data into an image and report that can be used by construction professionals. Analysing the data is not something a layman can do – it requires a great deal of training and experience to understand what the raw data means, which leads us to our next point.
2. Employees behind the equipment
The price you pay for a GPR survey doesn’t just cover the cost of the equipment used. You are also paying for expertise gathered over many years, in some cases, by the operators of the equipment.
Construction companies can hire GPR equipment and operate it themselves. But as indicated above, the raw results gathered by GPR equipment do not tell the whole story, nor are they presented in an easy-to-understand picture of what lies where. Expert GPR surveyors must then correctly interpret the findings of the GPR equipment.
It’s always best, then, to work with a GPR survey provider that offers a complete package with all of the hardware, software, and human resources needed to see through a GPR survey from start to finish.
Here at KB GPR Surveys, we aim to be transparent about the cost of our services in our dealings with all clients and can provide a detailed cost breakdown if you request a quote from us. If you are interested in finding out more, please fill in our online quote form on the website. With just a few details, such as the survey location, the type of survey you need, and your basic information and contact details, we’ll be able to get back to you with a precise quote.
We work on GPR surveys for both commercial and domestic clients, and we offer a variety of different surveys suitable for a range of applications. Whether you’re in construction and want to map the site before work begins, a team of archaeologists planning your next excavation or a homeowner looking to build an extension, we’re confident we can recommend and provide the expert services you need.
If you have any questions, you can call us on 020 3931 5759 or send an email to firstname.lastname@example.org. Our head office is located at 29 Hope Road, West End, Southampton, SO30 3GE, but our services are offered throughout the UK.
The acronym GPR stands for Ground-Penetrating Radar, a technique that employs an electromagnetic signal to create images of what’s below the earth’s surface. GPR equipment usually includes a transmitter, receiver, and signal encoder. Standard GPR utility mapping has a penetration depth of approximately 2-3 metres. The GPR survey costs will vary depending on the size of the area being surveyed.
Ground Penetrating Radar can penetrate depths of up to 100 feet (30 metres) in materials with low conductivity, such as dry sand or granite. GPR signals can be attenuated or absorbed by moist clays, shale, and other high-conductivity rocks, reducing penetration depth to 3 feet (1 metre) or less.
A GPR survey can locate PVC and plastic pipes utilised for utilities and other applications. Although a stronger signal is returned by metal pipes, GPR (unlike metal detection) can locate objects made of most materials. Whether or not a pipe is full of water makes no difference to the survey results.
Yes, GPR can penetrate through ordinary and even reinforced concrete. GPR is often used for the non-destructive testing and mapping of objects within concrete, such as rebars, pipes, ducts, cables, and other items, and as part of an infrastructure assessment for bridges, roads, and buildings. The concrete scanning cost will depend on the extent of the area being surveyed.
Ground-penetrating radar can offer precise results but not necessarily reach 100% accuracy. Factors affecting the quality of the findings include soil conditions, the conductivity of particular materials and the depth of objects beneath the surface. The surveyor’s expertise and sophistication of their equipment also play a part, something to bear in mind when evaluating a company’s quoted GPR inspection price.
GPR transmitters send pulses of electromagnetic radiation into the subsurface to detect objects and variations in the subsurface composition. When the pulses hit an object or variation, the signal is reflected and creates an echo which is recorded when it returns to the surface by a receiver. Specialist GPR software then interprets the echoes to create images of the object.
Ground Penetrating Radar (GPR) is a method for detecting subsurface features and anomalies such as pipes, voids, cracks, and alterations in soil composition. GPR transmits energy waves and then interprets the reflected signals.
A GPR uses microwave band radiation for detection. The reflected and refracted signals collected by the GPR’s receiving antenna are used to map objects, voids, material changes, and other anomalies. By providing a clear picture of the difficulties and items that may be encountered when digging or drilling, for instance, construction experts can avoid damaging existing utility pipes and otherwise draw up a strategy for locating, avoiding, or otherwise dealing with such variances. This can save a great deal of time and money over the course of a construction project.
However, to create, conduct, and interpret the resulting images, GPR must be conducted by highly-trained specialists. Although GPR can identify items subsurface, it cannot distinguish between various materials – only a skilled operator can do that.
Ground Penetrating Radar (GPR) works by sending low-level pulses of RADAR energy into the ground and recording how long it takes for any reflections to return to the antenna. Hundreds of thousands of pulses are sent hundreds of thousands of times per second to display a real-time image on the screen for the operator. The emissions from GPR systems have been evaluated and certified to be safe even when used in close proximity to people and equipment. An operator can often determine where an obstruction, void or other object is located, its depth, and sometimes its type.
Because the typical GPR evaluation rate for such services has proved to be cost-effective, GPR is now being used at all stages of many construction projects, from estimating building costs to identifying pre-existing utilities and other objects; from offering detailed advice during the excavation phase through to offering quality assurance and documentation after work is completed on a project. GPR offers added value at each of these stages.
For best results, GPR surveys should be carried out by a specialist, experienced team that has invested in the most up-to-date equipment available.
Ground Penetrating Radar (GPR) is a technique to examine what lies below the subsurface in a particular area. GPR tends to function well on land or in freshwater, but not in saltwater, because the high conductivity of this disperses the radio energy.
GPR equipment detects changes in the dielectric constant of subsurface features as the EM waves move from one material to another; the change in the dielectric constant causes some of that energy to be reflected toward the radar antennas. The depth is determined by two-way travel time, but instead of water speed through sound, it’s electromagnetic propagation through a variety of media (which can vary considerably depending on what material is being imaged). Professionals can identify the stratigraphic sequence’s nature without breaking ground using this two-way travel time.
If you are looking for an affordable, high-quality ‘GPR survey near me’, you can trust our specialists here at KB GPR Surveys. We are an independent and innovative multi-disciplinary team of professionals who can advise on and carry out GPR surveys for a range of applications, including construction, archaeology, and more. Contact us to discuss your project today.