Dhanbad Municipal Corporation GPR Survey on Coalfields

What does a Dhanbad Municipal Corporation utility survey cover?

It records the pipes, cables, drains and ducts beneath a road within DMC limits and points out loosened or hollow ground near the surface. Fresh work on the construction site can then be planned and dug without harm. A ground penetrating radar survey elsewhere aims only to avoid striking a service, while Dhanbad adds a second aim: spotting ground that has started to misbehave.

The corporation was formed in 2006 by merging the old Dhanbad municipality with the Jharia, Sindri, Katras and Chhatatand notified areas, plus many census towns and villages. It now has 55 wards over about 356 square kilometres. Each old body kept its utility data differently, so one road may run from a well-filed ward into an ex-notified area with barely a sheet of paper.

Why is Dhanbad different from other cities?

Coal. Wide tracts of Dhanbad sit above the Jharia seams, with working and abandoned collieries, buried fires and sinking land. The Union Cabinet approved a revised Jharia Master Plan for fire, subsidence and rehabilitation in June 2025, which shows how serious the problem remains. Colliery land is spread through many wards, and for buried services this matters in three ways.

• Pipes and cables can be bent, pulled or broken as the ground settles. A main water pipeline near Kendua was reported damaged by subsidence in 2022.
• Colliery areas carry their own lines, owned by the mining company, alongside civic services.
• Roads may have been patched and raised repeatedly over sinking ground, so services sit deeper than expected.

Can GPR detect subsidence or voids under a road?

Radar can reveal hollows, slack fill and broken-up strata in the top few metres, the zone that endangers roads, trenches and pipes; old galleries far below stay beyond its reach. That limit is important, and we state it plainly in every Dhanbad report.

A bright, flat-topped return with ringing below it, or soil bands that dip without warning, is marked as a suspected hollow or loosened patch. A check is advised before heavy machines cross it. Our separate void detection service covers this in more depth. Deeper coal-working risks belong to a geotechnical study, and our report says so.

Who owns the services you might meet?

It depends on where in the city you are.

Table note: fresh pipes that must be logged before the trench is closed are covered by as built survey for Dhanbad sites.

The municipal water supply project, built for the corporation by the state drinking water department and handed over in phases from 2021, added new mains across the city. Being new, most have a known route, though seldom to the precision an excavator needs.

How does the survey run on site?

Radar, then locator, then manholes, with only ground-proven lines on the sheet. GPR sends electromagnetic waves into the road and reads the echoes from pipes and soil changes. On a DMC road the team makes lengthwise passes plus cross-passes at junctions, follows each energised cable with the locator for utility locating and opens covers for true depths. The reasoning behind that mix is set out in a short guide on underground utility detection methods.

Sagging tarmac, cracks and sunk manhole lids are photographed and located, as over the coalfield they reveal as much as the radar.

Coal trucks fill Dhanbad roads by day, so passes are slotted around them with cones, a spotter and, when required, dawn or night shifts. The metre rate stays the same.

What files will you receive?

A layered drawing, a schedule and a short written report. Every one of the underground utilities is shown by kind, with rough depth and a confidence tag, beside suspected hollows. For file formats and layers, read: CAD and GIS utility mapping. The register lists each line identified and mapped, with every crossing, and the report explains where the radar's view ran out.

Designers can also have levels and kerb lines captured during that visit; here is how our topographic survey works. Repeat levels later help follow a length where sinking is feared.

What does a Dhanbad survey cost?

Per metre, Dhanbad scanning costs ₹24 standard or ₹32 with an L-section; smaller jobs are billed at the ₹1,00,000 project floor.

• Whole-order slab discount: 25% above 100 km, 40% above 500 km, 50% above 1,000 km
• GST extra
• Dhanbad mobilisation, where chargeable, quoted separately in our estimate

Five kilometres of L-section along a pipe route totals ₹1,60,000 plus GST. A 2.5 km standard scan works out at ₹60,000, so the minimum applies. A surveyor of ours is based in the area, so coalfield work opens straight after approval, with the wait capped at one business day.

Can levels show whether a road is sinking?

They can help. Over the Jharia seams, a road that drops a few centimetres between visits is giving a warning. We fix stable control off the affected ground with DGPS points outside the coalfield zone and set small marks along the road. A total station for settlement readings then records each mark and nearby chamber covers. Compared over time, the figures show whether a stretch is moving. The radar layer shares that base, and judging safety stays with the engineer and the mining authorities.

Who surveys DMC roads in Dhanbad?

Our own staff, using radars and locators the company owns. Coalfield scanning and reporting rest with Mezux Touch's own team. Our history in the trade runs back to 2003, our 58 GPR systems are company property, and subcontractors never work our Jharkhand sites. ISO 9001, 14001 and 45001 frame how we operate. Some DMC jobs come to us as the corporation's own work orders. Others arrive through the builders, consultants and utilities it engages.

Need DMC utility mapping, or worried about a sinking stretch? Request a site visit for Dhanbad and expect a written scope from one of our engineers.

Frequently asked questions

Will your survey certify a road above old galleries as safe?

We cannot give that assurance. Radar reveals near-surface hollows and loosened soil; old deep galleries call for a geotechnical study.

Do you survey in Jharia, Sindri and Katras too?

Yes. Each one-time notified area inside DMC, plus land past its edge, gets the identical approach.

How do you show uncertain lines on the drawing?

Doubtful lines get their own line type plus a remark. To see how layers and confidence are recorded, read: utility mapping.

Will colliery cables show up?

Live metal ones answer the locator in real time, and radar may catch others. Ownership stays blank unless markers or files prove it.

Can you rescan a stretch later to check for settlement?

Yes. A repeat scan with fresh levels a few months on reveals any shift in soil bands or buried utilities.

Is there a charge for marking on the road?

No. Spray marks for every line found come within the survey.

Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026