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.

  1. 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.
  2. Dimensions of extent of defects was also extracted using Planys’ unique LASER scaler.
  3. Planys’ proprietary image enhancement algorithm was used to enhance the videos taken in the extremely turbid waters.
  4. 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