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Bellwether choose GEOmasta to stabilise Kedron Brook embankment

Bellwether choose GEOmasta to stabilise Kedron Brook embankment

Significant erosion and embankment failure was identified alongside Brookside Shopping Centre carpark in the Brisbane suburb of Mitchelton. An engineering assessment recommended remedial and stabilisation measures should be undertaken at 10 locations along the bank of Kedron Brook. Engineering drawings and a flood impact assessment using 2D hydraulic modelling confirmed that remediation works would not adversely impact flood behaviour in the creek. Ultimately, vegetated rock protection was recommended as a preferred treatment, and Brisbane City Council in conjunction with shopping centre managers Retail First engaged contractors to carry out the works.

Bellwether Contractors secured this project along with a series of subcontractors, and the necessary works were undertaken to restore the stability of the Brookside Shopping Centre carpark and prevent further erosion.

For this project, Bellwether sought a series of reliable, effective geosynthetic products. GEOmasta geotextile, geocell and strip drain products were specified due to their high quality and proven performance in the field.

GEOmasta mastaTEX Nonwoven, GEOmasta EroWeb and DRAINmasta Strip Drains were utilized to improve the embankment.

GEOmasta supplied Bellwether with mastaTEX Nonwoven GF54 and mastaTEX Nonwoven Class C GF34 as a separation and stabilisation layer. mastaTEX Nonwoven is a continuous filament PET geotextile that is used extensively in road and rail works as well as in landscaping for slope stabilisation.

Then, DRAINmasta Strip Drain was laid at intervals to help efficiently filter and transport water runoff into the creek. Specifically designed for subsoil drainage, Bellwether chose the 200mm strip drain to effectively filter runoff, thereby helping to maintain the health of the waterway.

Finally, EroWeb EC1535 was installed to create a suitable base for subsequent landscaping and revegetation. EroWeb is a lightweight and flexible 3D geocell constructed from perforated HDPE. It assists with slope protection and erosion control and can be filled with a range of material including aggregate, concrete, sand or in this case, soil.

A landscape contractor was subsequently engaged to revegetate the riparian corridor with grasses, trees and shrubs.

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