Cotter

WCC Engineers were engaged to undertake construction conformance inspection and certification scaling of loose rock and timber by specialised contractors off slopes of the over 100 m high Cotter Dam canyon.

A UAV was used to undertake the inspections and photograph the completed work which were used to demonstrate completion, while an ITP was developed to capture inspection Hold and Witness Points.

During construction costing of further stabilisation works of landslide hazards on the southern rock face was requested requiring rock mechanics analysis and design. Due to the height and steepness of the identified Hazards the UAV was used to capture imagery for Photogrammetry.

The Photogrammetry provided a fully rendered scale 3D model of the rock face which was used for inspection by the designing Engineer.

This Photogrammetry model was subsequently exported into AutoCAD Civil 3D to derive landslide hazard Geometry for use in rock mechanics stabilisation and design analysis software.

Landslide hazard mitigation measures were subsequently developed including structural rock dowels, draped mesh and catch fences to mitigate the landslide hazards. These were provided on Plates showing extents and estimated quantities.