GPR Survey in Mayur Vihar, East Delhi — Underground Utility Detection

Floodplain ground, and what it does

Mayur Vihar sits on old Yamuna floodplain deposits — fine, soft and saturated relatively close to the surface. Both properties work against radar, so achievable investigation depth here is measurably less than on the harder ground west of the river.

We assess before mobilising and state the depth achievable for the specific location rather than offering a citywide figure. Where a design decision needs confidence below what radar will reach in this ground, complementary locating or selective verification is the honest recommendation, made at scoping rather than after an inconclusive report.

Groundwater also varies seasonally with the river, so the same route surveyed in different months can read differently. The report carries the condition on the survey date for that reason.

Settlement shows in the services first

Soft ground settles, and buried services settle with it — unevenly, following the fill depth and loading above them. A pipe laid level twenty years ago is not necessarily level now.

That matters for gravity drainage in particular, where a small loss of fall causes standing water long before anything is visible on the surface. Depth profiling along a sewer run frequently explains a drainage complaint that nobody could otherwise account for.

We record cover continuously rather than sampling, because on this ground the variation between points is the finding.

Voids and washouts around drainage

Saturated soft ground and leaking drainage together produce loss of fines, and the cavities that result are a recurring find here rather than an exception.

These are reported separately from the utility plan because they describe a structural risk to the road or slab above rather than the position of a service. On this ground a void found early is considerably cheaper than the collapse it would have become.

The DDA pockets and the link corridor

The planned pockets were serviced as coherent schemes and their layouts are a reasonable starting position, though decades of connections have drifted from them. The resettlement colonies nearby have a denser and far less documented pattern.

The Noida Link Road corridor carries trunk servicing alongside heavy traffic and the metro alignment, with night-only working windows and diversions from metro construction that moved services from their recorded positions.

Approvals and deliverables

Work may involve the municipal corporation, the development authority on planned pockets, the PWD on arterials, the metro corporation on its alignment and the irrigation and flood control department near the floodplain.

Output is layered CAD with depth annotation, GIS files where kept, a PDF issue set and a report carrying achievable depth by section, the continuous cover profile and any void findings as separate schedules.

Sectors that call us in here

Civic and drainage work leads, much of it investigating settlement and standing water where the cause sits below the surface rather than on it.

Construction plot surveys follow, where bearing conditions matter as much as utility positions, with telecom corridor work along the link road making up the rest.