GPR Survey in Hauz Khas, South Delhi — Underground Utility Detection

Survey work in Hauz Khas runs through Delhi alluvium with made ground over former water margins near the reservoir; the depth we can stand behind is typically 2 to 3 metres, varying between the campuses, the colonies and the village core. Coverage rate is secondary here; what matters is the depth the ground permits. If your excavation passes that depth, verification rather than radar alone is the correct answer, and we say so before the work is booked.

How the survey is run here

The survey pattern for Hauz Khas is decided after the ground is assessed, not before. Ground that reflects on its own account gets tighter perpendicular coverage so it is not mistaken for plant. Rather than one calibration per job, we take one per ground condition encountered. Company equipment and company staff throughout, so no part of the programme sits with a third party.

What you receive

A layered DWG package built to your naming standard, with detection method and confidence recorded against every plotted line. GIS output as SHP or KML for clients holding a spatial database, plus a PDF set for wider circulation. A signed report giving coverage, per-section depth, inaccessible areas and an explicit statement of what the survey could not establish. On Hauz Khas work the report also records the authorities involved — the archaeological authority in the protected zone, South Delhi corporation zone, PWD on the Ring Road, DDA on park land, institutional estate offices — because the deliverable has to satisfy whichever of them receives it. The original data is kept on file and can be reissued if a finding is questioned long after the works.

Beyond the basics

Can you survey inside the protected zone? Yes, and it is usually the right first step because nothing is disturbed. Any excavation afterwards is judged on demonstrable necessity.

Can equipment reach the village lanes? Handheld only. Lanes are metres wide with buildings directly on them, so the village is quoted on its own conditions.

Do the institutions hold records? At their own estate offices where they survive. Campus work is bounded and access-controlled but usually well organised once inside.

Does the reservoir affect readings? Near it, yes. Made ground over former water margins behaves differently, so we calibrate along the route rather than once.

Can findings be issued as a risk register? Yes, and on design-stage work that is often the more useful format. Detected, verified and assumed items are listed separately with their consequence stated.

Terms used on this page

Protected zone — the regulated area around a monument, where an excavation must be shown to be necessary. Conservation officer — the reviewer who assesses a heritage application alongside the engineering case. Made ground over water — fill placed to reclaim a former pond or margin, of variable composition and moisture. No-access area — ground the survey could not cover, listed explicitly rather than left as an apparent gap in the drawing. Line spacing — the distance between adjacent survey lines; closer spacing finds smaller targets and costs more.