Spillway & Plunge Pool Inspection

Planys conducted underwater visual inspection of a  spillway, cellular wall and one intake unit of a critical dam in northeast India.

Scope of Work: Underwater visual  of the cellular wall to examine if there are potential sources of leakage from the TRC to ensure smooth functioning of the rehabilitation work and a pre-monsoon maintenance measure. It included inspection of joints on the cellular wall, Tail Race Channel (TRC), stilling basin & stop log grooves.

Planys Solution: The underwater inspection was undertaken using Planys’ ROV Orca equipped with high resolution camera, turbid water module, altimeter, and depth sensor.

  • Over 90 anomalies were identified and categorised into minor, moderate (60%) and major based on the size of the defects that included cracks, honeycomb formations, surface deformations, pinholes and debonding between layers.
  • Dimensions of extent of defects was also extracted using Planys’ unique LASER scaler.
  • Planys’ proprietary image enhancement algorithm was used to enhance the videos taken in the extremely turbid waters.
  • All anomalies/defects were plotted against geo-tagged CAD drawing of every section on the Planys Analytics Dashboard (PAD) with localised click-to-view video feature. The report was submitted to the client for relevant action points for re-work.

Images show deployment & site setup of the ROV system during inspection


 Images showing extracted images of cracks and debonding between layers at cellular walls & grooves with Planys ROV

“Hot-spot” map showing concentration of anomalies