City Area 30 Stormwater Rehabilitation

Sydney Water Corporation identified 128 stormwater assets in the Sydney CBD which required repair or replacement. KBR undertook the investigation and design for the works, with Aquenta providing cost estimating, constructability and other advice.

Our involvement

Aquenta was engaged to prepare a probabilistic risk based estimate for the program of works, which included estimating the value of all the asset repair and replacement, facilitating a risk workshop and carrying out probabilisitic modelling. Aquenta also evaluated the constructability, which involved the consideration of sequencing multiple excavation workfaces in the middle of Sydney’s CBD, interfacing with other major projects and the impacts of this evaluation on the direct and indirect costs of the works.


First principles estimating, Probabilistic risk estimating, Constructability advice.

The outcome

The probabilistic estimate was reviewed and accepted by KBR and Sydney Water, and formed the basis of funding approval for the project to proceed to market.