2017 - Ground investigation and geotechnical condition assessment

The investigation included drilling 42 boreholes along the crest of the embankments at 200‑metre intervals on alternative banks. Nineteen standpipes were also installed to monitor groundwater levels.

Soil and material samples from the drilling were tested in a laboratory.

Seepage analysis was also carried out to understand how changing groundwater levels during different flood scenarios could affect the stability of the embankments and to identify where water might seep through.