Patna Municipal Corporation GPR Survey on Ganga Alluvium

Why plan a Patna Municipal Corporation utility survey early?

Fresh sewer, metro and Smart City networks now sit over decades-old lines in Patna. Only a ground penetrating radar survey made before the design is locked reveals which of them a stretch holds. Done at the start, it lets the designer move a trench or bore line on paper, which is cheap, instead of on site, which is not.

The corporation grew out of a municipality set up in 1864 and became a municipal corporation in 1952. Its 75 wards, split among six circles, cover about 109 square kilometres along the Ganga's southern bank. Old-city lanes, planned western colonies and new arterial roads each hold a different mix of underground utilities.

How do the Ganga plains affect radar?

Thick Ganga silt and a shallow water table cut the radar's useful depth across most of Patna. The radar reads reflected signals from pipes, and wet silt with high electrical conductivity weakens them. In the dry months a medium-depth pipe shows clearly. Come July, with groundwater up and low wards under water, that pipe may fade to a ghost or vanish.

Patna's silt shapes our timetable. Deep trunk sewers and mains are scanned in the dry months where the schedule permits, with low-frequency antennas and the locator on metal lines. Measured manhole inverts act as fixed checks. On soaked stretches the sheet states what is uncertain and names the crossings that need trial pits. How the silt behaves across the circles is set out in GPR survey in Patna at a glance.

Which new networks have gone in recently?

Sewer lines under the Namami Gange programme, the first metro stretch, and Smart City road works are the big three. Under Namami Gange, BUIDCo has put in treatment plants and fresh sewer mains right across Patna, so roads that look bare on older sheets now carry large pipes. The first section of Patna Metro, between ISBT and Bhoothnath, was inaugurated in October 2025, and services along its alignment were diverted during construction.

Patna Smart City Limited, set up in November 2017, has also rebuilt roads and laid ducts. Add South Bihar Power Distribution Company cables, telecom fibre and city gas, and an arterial road can hold six or seven services. Replacement pipes often go in at a new depth while the old ones stay buried, so a Bailey Road verge can carry a dead main beside its working successor. Chamber lifts and patient tracing separate the two, so utility detection reflects only the live line.

What does the survey record?

Every Patna line we could pick up, plus how it was found and how far we trust the position.

Table note: kerbs, levels and carriageway edges can join the utility sheet via a topographic survey for Patna sites.

How is a long Patna corridor surveyed?

Stretch by stretch, each one scanned, checked and drafted before the next is released. We agree chainages first, then run data collection along the full alignment and cut across it at every crossroads, gali and manhole. Each completed length reaches you as utility data on a sheet plus schedule, so design or the cutting file moves ahead while scanning continues.

Radar, locator and manhole findings are merged into one file with separate layers; to see how those layers fit together, read: utility mapping. Patna-specific advice on records, flood-season timing and pits is in our utility survey guide for Patna.

What does a Patna survey cost?

Patna rates run at ₹24 per metre scanned as standard and ₹32 per metre with an L-section, with ₹1,00,000 as the floor on every project.

• Whole-order discount: 25% above 100 km, 40% above 500 km, 50% above 1,000 km
• GST is extra on every figure
• Patna mobilisation, if billable, is quoted as its own line in our estimate

Eight kilometres of sewer route at the standard rate means ₹1,92,000 plus GST. A 120 km fibre build qualifies for the 25% slab, bringing the standard-rate total to ₹21,60,000. A surveyor who lives in Patna leads the work and opens on site as soon as you approve, never more than a business day later.

Where do permissions come in?

After the survey and before digging. Each Patna road has its own keeper, be it PMC, a state roads body or another agency, and that keeper's consent is needed before cutting. Paperwork and fees change, so this page leaves them out. We hand your engineer the substance such a file needs: the alignment, the lines it crosses and their likely depth.

BUIDCo, the power company or an operator may insist on notice or a supervisor at the dig. Our register names every confirmed owner of the buried utilities, so your team can notify them together. Unknown lines are marked unknown, with a best guess at the owner from size, depth and route.

Why do Patna's flat roads need careful levels?

Patna is so flat that rain water often has nowhere to go, and a new sewer has only a small fall to work with. On PMC jobs we set control with DGPS survey work across Patna and run a total station between manholes for covers, inverts and road crowns, circle by circle. Lanes that pond after rain are flagged at their lowest points. Radar lines sit on this levelled base, so the designer sees whether an old main blocks the fall to a pumping station.

Who runs GPR surveys on PMC roads?

Every Patna scan is run by Mezux Touch employees on equipment we own. Our work on buried services dates back to 2003. The company keeps 58 GPR systems and 18 HDD rigs, and none of its Bihar fieldwork is subcontracted. Quality, environment and safety are certified to ISO 9001, 14001 and 45001. PMC has given us work orders directly, and builders, consultants and service agencies in its six circles commission our utility surveys too.

For PMC utility mapping, tell us the circle, the road length and the job, and ask for a rate for Patna.

Frequently asked questions

Is the dry season better for scanning in Patna?

For deep lines, yes. Saturated Ganga silt after the rains cuts radar depth, though shallow pipes and cables can be done in any month.

What about land beyond PMC's boundary?

Yes, including the growing outskirts; survey coverage in Patna details lists them.

Will the new Namami Gange sewer lines show up?

Mostly. These pipes are big and show clearly in real time, and their manholes supply measured depths for checking.

Can you scan inside a waterlogged lane?

Not while flooded. We come back when it clears, or tackle the dry lengths first.

Do you identify which company owns each cable?

Yes, when markers, chamber lids or files settle it; if not, it stays marked unknown.

Can the drawing be given in GIS format?

Yes. AutoCAD, PDF and GIS versions are available on request, on whichever coordinate system you name.

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