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Kristen Sih, Richard Rodd

Melbourne Water currently manages over 235 stormwater retarding basins. The process of assessing the risk posed by these assets began in 2006, and at the end of 2015 full risk assessments were completed for around 30 of the basins that were estimated to pose the highest societal risk. However, when analysing the results of these risk assessments, there was some concern that the results were inconsistent and often too conservative, given the few incipient or actual failures that had been experienced.

It was found that one of the key areas causing the conservatism was poor documentation of design and construction details, and the fact that the tools used for assessing the Potential Loss of Life (PLL) were aimed at larger storages that cause much higher depths and velocities in dambreak events than these (generally) small storages. To remedy this situation, advice was sought from specialist practitioners to develop guidance notes on the assessment of PLL and failure likelihoods for retarding basins.

On the back of these guidance notes, Melbourne Water initiated an accelerated program of assessing the risk associated with 78 retarding basins over a 6 month period. This paper describes the key recommendations from the guidance notes, compares the results of the risk assessments performed pre- and post-guidance notes and provides a summary of the portfolio risk assessment outcomes, what they mean for Melbourne Water and what the organisation intends to do to manage this risk into the future.

Now showing 13–24 of 55 search results:

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    2016  Papers

    2016 – Retarding Basin Portfolio Risk Assessment – Life in the Fast Lane

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    2016  Papers

    2016 – Towards Improved Efficiency of Dambreak Modelling and Consequence Assessment Projects

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    2016  Papers

    2016 – Would Bowties and Critical Controls Contribute to the Prevention of High Consequence / Low Frequency Dam Failures?

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    2017  Papers

    2017 – Estimating the Duration of Flood Overtopping for Risk Assessment

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    2017  Papers

    2017 – Factor of Safety? – Do we use it correctly?

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    2017  Papers

    2017 – Seqwater Dam Improvement Program – Assessment, Prioritisation, Justification and Implementation of Dam Upgrades

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    2017  Papers

    2017 – The Design Flood Frequencies for My Dam Have Changed – Why?

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    2018  Papers

    2018 – A Robust and Efficient Stochastic Simulation Framework for Estimating Reservoir Stage-Frequency Curves with Uncertainty Bounds

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    2018  Papers

    2018 – ANCOLD Proceedings of Technical Groups 1 Dam Safety Decision Making

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    2018  Papers

    2018 – Dam Safety Decision Making

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  • $15.00
    2018  Papers

    2018 – Review of the Impacts of Dam Operations on Flood Hydrology

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  • $15.00
    2019  Papers

    2019 – Estimating Design Floods with a Specified Annual Exceedance Probability Using Bayesian Analysis

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  • $15.00
    2020  Papers

    2020 – Challenges in applying new guidelines to existing tailings dams projects

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    2020  Papers

    2020 – Demonstrating risk benefits of improved monitoring and surveillance

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  • $15.00
    2021  Papers

    2021 – Mundaring Weir, Stilling Basin and Outlet Works Risk Assessment

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  • $15.00
    2021  Papers

    2021 – Risk analysis and safety upgrade of Mangrove Creek Dam; SFAIRP assessment under Dam Safety NSW regulations

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