GPR Survey in Najafgarh, South West Delhi — Utility Detection

For Najafgarh the governing condition is alluvium with a water table governed by the drain and jheel margin, and the depth that follows from it is typically 1.5 to 2.5 metres, falling further through and after the monsoon. How far the radar reaches decides the value of the survey far more than how fast the crew moves. If your design needs confidence below that ceiling, we recommend complementary locating or trial holes at scoping stage instead of delivering an inconclusive drawing afterwards.

How the survey is run here

Line spacing on Najafgarh work is set against what the ground allows rather than against a standard grid. Where the ground itself reflects, we add perpendicular passes to separate the material from real utilities. We recalibrate at every change in ground rather than once, which keeps depths comparable along a mixed route. Everything is delivered by our own crews on our own equipment, so a start date is a commitment rather than a forecast.

What you receive

A DWG issue organised on your layer scheme, where each detected line carries depth, detection method and confidence as data rather than annotation. Spatial output as SHP or KML on request, plus a PDF set sized for site circulation. A signed survey report stating coverage achieved, achievable depth by section, areas of no access and every limitation encountered. On Najafgarh work the report also records the authorities involved — the south west corporation zone, the irrigation and flood control department near the drain, DDA on planned parcels, revenue authorities on village land — because the deliverable has to satisfy whichever of them receives it. We keep the underlying data, which matters when a drawing is questioned during a claim rather than during construction.

Beyond the basics

Are there usable records in the colonies? Rarely. These grew as unauthorised or later-regularised areas where servicing was added informally as demand arose.

Does the drain affect survey performance? Substantially. It governs groundwater across a wide belt, and saturated ground measurably reduces achievable depth.

Is trench stability a concern? Yes, poorer than in drier parts of Delhi. Shoring is worth designing against measured conditions rather than a citywide assumption.

What turns up in the growth belt? Field drains, irrigation channels and abandoned borewells beneath recent fill, none of it on a developer's layout.

Do you provide the drawing before the works start? Yes, and we prefer to issue a draft for comment first, so layer naming and format are agreed before the signed version rather than corrected afterwards.

Terms used on this page

Regularised colony — an area given legal standing without any retrospective production of layout drawings. Water table — the level below which ground is saturated, which here follows the drain rather than rainfall alone. Seasonal reading — a depth or condition recorded against a date, because the same line will read differently at another time of year. Detection method — how a particular feature was found, recorded per feature because it governs how far it can be relied on. Cover — the depth of material above a buried service, measured from the finished surface.