GPR Survey in Greater Kailash, South Delhi — Utility Detection

Survey work in Greater Kailash runs through Delhi alluvium under colony fill, disturbed close to plots by four decades of rebuilding; the depth we can stand behind is typically 2.5 to 3.5 metres on colony roads, less across the market blocks. The depth ceiling is the honest constraint here; coverage rate is a secondary concern. Where your works go deeper than the ground allows, we say so at scoping and recommend electromagnetic locating or physical verification rather than issuing a report that cannot support the decision.

How the survey is run here

We set line spacing in Greater Kailash from what the material will actually return. Tighter cross-coverage is applied where the material would otherwise imitate a service. Each change of material triggers a fresh calibration, so the depth column can be read end to end. Owned systems and our own operators, which removes the usual reason a survey start slips.

What you receive

A layered DWG package built to your naming standard, with detection method and confidence recorded against every plotted line. GIS files in SHP or KML where you maintain a spatial record, and a PDF issue set for circulation. A signed survey report covering what was surveyed, the depth reached on each stretch, any inaccessible areas and the stated limitations. On Greater Kailash work the report also records the authorities involved — South Delhi corporation zone, the power and water utilities on their own assets, PWD on bounding arterials — because the deliverable has to satisfy whichever of them receives it. We archive the underlying radar records, which matters when a drawing is challenged during a dispute rather than during construction.

Beyond the basics

Why survey the verges rather than the road? Because mature tree cover forced routing around root systems, and later additions took whatever line was free. The verges hold more and less predictably.

Do you find private borewells and sumps? Frequently on plots of this vintage, and we list them separately because they belong to an owner rather than a utility.

Can you work in the M and N block markets? In early-morning windows only. Working width is minimal and trading runs late, so coverage is a fraction of the colony roads.

Do you survey before a basement excavation? It is most of our work here. A modern raft extending toward the boundary changes what is possible in the road outside it.

Can you attend site if something is struck later? Yes. We investigate against our own records rather than defending the drawing, and the report already states where confidence was limited.

Terms used on this page

Plot-level redevelopment — the piecemeal rebuilding of individual plots, each adding servicing that never returned to a colony drawing. Verge — the strip between carriageway and boundary, which here holds more services than the road itself. Abandoned connection — servicing left in place when a plot was rebuilt, indistinguishable from live plant without verification. Duct bank — several ducts encased together in concrete, which reads as one structure rather than as separate lines. Invert — the inside bottom level of a pipe, which is what governs fall on a gravity drain.