OFC Route Survey Lessons from Bawana, Okhla and NDMC

Updated: 23 October 2026

What does an NCR OFC route survey actually involve?

An OFC route survey maps what already lies under a planned fibre alignment before a single duct is trenched or bored, and the OFC route survey lessons in this article come from doing exactly that on Delhi NCR roads. On Delhi NCR roads that usually means power cables of several voltages, water and sewer lines, gas pipes, storm drains and other operators' ducts, often packed into the very footpath strip you want to use.

We run ground penetrating radar along the alignment and across it, then trace metallic utilities – power cables, metal pipes – with an electromagnetic (EM) cable locator. Whatever we detect gets painted on the surface and entered, with location and estimated depth, in a report our team signs.

The lessons below are general ones about method and planning, drawn from the kinds of corridor the region keeps presenting; they do not describe any single job. For the service itself, see our OFC route GPR survey page.

Why do NCR fibre routes need a survey before ducting?

Fibre is usually the last of the underground utilities to arrive in an NCR street. By the time an operator applies to lay ducts, the road edge already carries cables from the power distribution company, pipes from the water utility and, in many areas, a city gas network. Records exist, but they sit with different owners, use different base maps and are rarely updated after repairs or diversions.

Three practical reasons make a survey worth more than it costs:

• Strike risk. An HDD head or trencher that hits an HT cable or gas main stops the job and can injure people.
• Route choice. Knowing where the footpath is already crowded lets you move the alignment before permissions are filed.
• Depth planning. Bore profiles at road and drain crossings can be set to clear known services instead of guessed ones.

Within Delhi alone, power distribution is split between BSES Rajdhani, BSES Yamuna, Tata Power-DDL and the NDMC, so one corridor can involve more than one cable owner.

Which OFC route survey lessons do NCR corridors teach?

The place names in this article's title stand for kinds of ground that recur across the region. Add the long arterial roads and transit corridors, and you have most of what an NCR fibre route crosses.

Planned industrial estates such as Bawana and Okhla

Bawana in north-west Delhi and Okhla in the south are planned industrial areas with heavy power feeds, process water and drainage laid to factory needs. Units have changed hands and use many times, so abandoned connections sit beside live ones. Treat every unclaimed line as live until its owner confirms otherwise, and allow extra passes at plot entrances where feeds cross the footpath. Locality detail is on our Okhla GPR survey page.

Council-maintained central areas like NDMC

The New Delhi Municipal Council area has wide avenues, mature trees, roundabouts and an older, carefully kept network beneath them. Space is not the problem there; disturbance is. Routes often have to hug one particular strip, so the survey must show where services sit across that strip, not only along it. Our NDMC area mapping guide goes deeper.

Arterial roads and expressway service lanes

Ring roads, NH-48, NH-44 and the service lanes of corridors such as the Dwarka Expressway offer long, straight runs where radar progresses quickly. The lesson is to slow down at junctions, flyover piers and drain culverts, because services converge and change depth there.

Metro and RRTS corridors

Delhi Metro and the Delhi–Meerut RRTS have diverted many services during construction. Diverted lines rarely follow old drawings, so stretches next to viaduct piers and stations deserve their own close grid.

Which survey terms should an OFC planner understand?

Survey reports and work orders in the region lean on a handful of terms that are worth agreeing on before an order is placed:

• Route survey – a scan along the planned alignment with cross-lines at intervals, giving positions and depths of services in the corridor.
• L-section survey – route scanning with a running depth profile of each detected service added, charged at ₹32 rather than ₹24 per metre. See L-section GPR survey.
• EM locating – tracing a conductive cable or pipe by the signal it carries or one we apply, which confirms what radar sees.
• Depth reach – the penetration depth at which the radar signal stayed usable on a given stretch: shallower where moisture content is high or the clay is saline, because signal attenuation is stronger there, and deeper in dry sand.
• Crossing – any point where the fibre route passes under a road, drain, rail line or another service, usually planned as an HDD bore.
• No-access stretch – any length the cart could not cover – blocked by cars, building material or a locked gate – which the report names so no one reads it as clear.

What separates a useful route survey from a weak one?

Two reports can cover identical kilometres and still differ greatly in value. The ones that hold up on site share a few features:

• Every find is tied to the route, not to a loose sketch, so the boring crew can locate it again.
• Depth is given as an estimate with the method stated, never as a guarantee.
• Depth reach is written section by section, so a planner knows where the radar could not see.
• Unidentified lines are listed as unidentified rather than guessed into a utility type.
• Ground marks are painted or pegged in utility colours before excavation, and the report survives after the paint fades.

If a client wants CAD or GIS drawings as well, we prepare them from this survey data under a separate quotation, never inside the metre rate.

How should an OFC route survey in NCR be planned?

1. Fix the alignment first. Send a KML or route drawing with the total length and the side of the road you intend to use.
2. List the crossings. Road, drain, metro and rail crossings need closer coverage and should be flagged at the start.
3. Collect whatever records exist. Even partial drawings from the power, water or gas owner tell us where to look hardest.
4. Settle access and working hours. Road permissions sit with the road-owning agency, so check with that agency rather than assuming a procedure. Traffic arrangements and night working are billed outside the survey rate.
5. Group nearby stretches. Several short NCR links placed in one order count together towards the 4 km minimum and the discount slabs.
6. Plan excavation soon after the survey. Paint marks on busy roads fade within days.

Corridor planning for the capital is covered on our Delhi OFC route survey page.

How should survey records be kept once the fibre is live?

A fibre route lives for decades, and the survey report is often the only document explaining why the duct runs where it does. Keep it with the as-laid record rather than in a project folder that gets archived and forgotten.

• Store the signed report, the route file and photographs of the ground marks together.
• Note any trial pits or boreholes that confirmed a depth, with the date.
• Record later diversions by other utilities when you learn of them; the next survey on that road starts from your file.
• When the corridor is scanned again, compare the new report with the old one, since changes show where others have dug.

What does a route survey cost in Delhi NCR?

Pricing per metre does not change across the region. A standard route survey is ₹24 a metre, which works out to ₹24,000 per km; the L-section version is ₹32 a metre. Orders under 4 km are charged as though they were 4 km long. Because our crews and systems are based in Faridabad, sites inside Delhi NCR carry no ₹1,00,000 project minimum – that floor applies only to projects outside the region. GST is added on every amount.

Bigger rollouts are cheaper per metre across the board: an order longer than 100 km is discounted 25% from its first metre, one beyond 500 km by 40%, and one beyond 1,000 km by 50%. Travel and mobilisation, work after dark, traffic management and drawing sets in CAD/GIS form are priced as separate items. Every slab is laid out on our GPR survey price list, and regional coverage is summarised on the Delhi NCR GPR survey page.