Keiges Road Reservoir

Summary:

Crib wall	curved
Max Height	3.85m Face Area = 334m²
Length	160m
Foundation	moderately weathered sandstone
Retained material	moderately weathered sandstone with some clay sections.
Imposed loads	generally 5kPa with the maintenance road at 10 kPa.

Ipswich Water required the removal of failed shot-crete batter protection. This was replaced with an aesthetically pleasing, engineered retaining system, curved to match the circular water reservoir.

The council chose to use a Concrib concrete crib wall system that addressed the design criteria, as well as meeting budget constraints.

Some concerns were raised regarding the variable nature of the foundation material (which ranges from clay to moderately weathered sandstone), as well as the need for efficient drainage of the embankment.

Concrib was awarded a design / construct contract. After investigative drilling, a design was proposed and certified.

The wall has a maximum height of 3.8 metres — tapering to about 1 metre at each end — over a length of 160 metres, for a total face area of 334 square metres. The radius of the curve is approximately 40 metres.

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