Underground Utility Survey in Patna

Updated: 23 October 2026

What is an underground utility survey in Patna?

An underground utility survey in Patna is a non-destructive inspection of the ground beneath a proposed trench, bore path or foundation. It tells the excavation team which services cross or follow the route, roughly where and how deep each one lies, and which stretches could not be cleared with confidence.

Ground penetrating radar sends short pulses into the soil, and any object whose dielectric properties differ from the soil returns an echo, so pipes, cables, ducts, chambers and voids appear whether they are metal or plastic. A cable locator then traces metallic utilities – power cables, metal water mains and the like – through the current they carry or a signal applied to them. Each find is marked with paint or pegs and written up in a report.

A survey does not replace service records or permissions. It tests them against the ground, which matters wherever roads have been widened and resurfaced many times.

Why survey before digging in Patna?

The city stretches along the south bank of the Ganga, and its main roads carry services laid by several owners over many decades. Power distribution is the job of SBPDCL (South Bihar Power Distribution Company); civic roads, drainage and water fall to the Patna Municipal Corporation; telecom operators add copper cables and fibre ducts. Each body keeps its own records, and none holds a complete picture of any one street.

Patna Metro, now under construction, moves and diverts existing services, so a corridor mapped a few years back may not match what lies under it today.

Striking a live underground cable or water main brings repair bills, contract penalties, idle days and, with HT cables, real danger to the gang.

Mezux Touch is not affiliated with SBPDCL, the Patna Municipal Corporation, the metro project or any other authority or DISCOM; we report only to the client who commissions the survey.

Which types of survey suit Patna projects?

Route survey for a cable, pipe or duct

Continuous radar lines along the alignment, with short transverse passes at junctions, chambers and poles – the usual scope for HT/LT cabling, water lines and OFC ducts, at ₹24 per metre.

L-section survey

The same scan with a plotted depth profile for each detected service, at ₹32 per metre; our L-section GPR survey page explains what it adds.

Area or plot scan

A grid of radar lines across a plot, campus, depot or yard, billed on the total length of grid lines.

Crossing scan before HDD

A focused scan of a bore path and its launch and exit pits under a road or drain. The drilling side is on our Patna trenchless page.

Add-on tasks

Cable fault locating is a separate job. Trial pits or boreholes can be added on request wherever a depth or an identity must be proved.

What do the terms in a survey specification mean?

• Detection – radar or EM registered a buried feature; on its own, that does not say what the feature is.
• Identification – deciding that a feature is a water pipe rather than a cable, from its shape on the radargram, its EM response and surface clues such as valves or chambers.
• Approximate depth – worked out from signal travel time and an estimated wave speed for the soil, so it is an estimate, never a surveyed level.
• Penetration depth – the deepest level the radar could read on that stretch. High moisture content, waterlogged clay and salty soil cause signal attenuation and cut it short, while dry sand lets the signal travel further. It is reported section by section.
• Running metre – the billing unit: one metre of route surveyed.

For more on why reach varies, read our note on soil conditions and GPR limits.

What should a reliable survey deliver?

• Marks on the ground in utility colours, each carrying its approximate depth, placed before excavation.
• A signed report listing every find, the method that picked it up, and a note wherever confidence is low.
• Stated limits – unscanned stretches and the depth reached per section, so nobody assumes clear ground where the radar was blind.
• Owned equipment, in-house crews. Mezux owns every one of its 58 GPR systems and 18 HDD rigs, and no work is sub-let.
• Management systems certified to ISO 9001:2015 (quality), ISO 14001:2015 (environment) and ISO 45001:2018 (occupational health and safety).
• Extras priced openly. CAD/GIS drawing sets carry their own quote; see CAD and GIS utility mapping.

How do you plan and budget a Patna survey?

1. Fix the scope. Share a KML file or drawing, the route length and what is going into the ground.
2. Choose the season where possible. Monsoon rain leaves low-lying parts of the city waterlogged; saturated ground shortens radar reach and standing water can stop scanning, so deep crossings suit a drier spell.
3. Arrange access early. Carriageway permissions take time, and permits, traffic control and night work all sit outside the metre rate.
4. Group the work. Mobilisation from Faridabad is its own quote line; adding other Bihar routes to the order spreads it.

The metre rate is ₹24 for a standard scan; adding the depth profile takes it to ₹32. Because Patna lies outside Delhi NCR, two floors apply: every order counts as at least 4 km, and every project as at least ₹1,00,000. A 3 km lane job therefore comes to ₹1,00,000, since 4 km at ₹24 gives ₹96,000, which is lifted to the floor. A 6 km duct route works out to ₹1,44,000 standard or ₹1,92,000 with an L-section. Long programmes get a discount on the whole order, in three slabs: a quarter off when the total tops 100 km, 40% off beyond 500 km, and half off beyond 1,000 km. GST is added on top.

Every slab is on the GPR survey price list, and our service page for the city is GPR survey in Patna.

How should survey records be kept once the work is done?

Paint fades in days on a busy road and pegs get pulled out, so the report is what lasts. Keep it with the project's as-built papers, tagged with your own road names and chainages. Add what excavation actually exposed – a pit that confirms a depth turns an estimate into a measured fact – and record the new service you lay, with its depth. If months pass and other agencies dig nearby, especially close to the metro works, survey again before fresh work.

Other capitals are listed on our state capitals GPR survey hub.