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Climate Change Impacts on ‘Seasonality Index’ and its Potential Implications on Rainwater Savings

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  • Monzur A. Imteaz

    (Swinburne University of Technology)

  • Iqbal Hossain

    (Swinburne University of Technology)

Abstract

Seasonality Index (SI) is commonly used to define rainfall variability within a year for a locality, which has got significant impact on the water resources planning and management. Both the longer periods of dry and wet conditions are reflected by SI value. As SI is calculated using historical rainfall data, a historical average value is represented for a locality. However, with the emerging impacts of climate change SI values based on historical data are likely to change. This paper presents expected changes in future SI values for the largest city of Australia (Sydney) based on projected future rainfall scenarios for the city. The paper further illustrates potential water savings through rainwater tanks under projected climate change scenarios using an earlier developed daily water balance model, eTank. For the simulations of potential water savings through rainwater tanks, projected daily rainfall data was collected from Australian government data portal for four stations within Sydney. Future potential rainwater savings efficiencies were correlated with the corresponding SI values. It is found that such correlation closely matches with an earlier developed correlation using past historical data, however the future water savings efficiency will be slightly lower than the past water savings efficiency.

Suggested Citation

  • Monzur A. Imteaz & Iqbal Hossain, 2023. "Climate Change Impacts on ‘Seasonality Index’ and its Potential Implications on Rainwater Savings," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(6), pages 2593-2606, May.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:6:d:10.1007_s11269-022-03320-z
    DOI: 10.1007/s11269-022-03320-z
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    References listed on IDEAS

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    1. Moniruzzaman, Muhammad & Imteaz, Monzur A., 2017. "Generalized equations, climatic and spatial variabilities of potential rainwater savings: A case study for Sydney," Resources, Conservation & Recycling, Elsevier, vol. 125(C), pages 139-156.
    2. Andrew D. King & Andy J. Pitman & Benjamin J. Henley & Anna M. Ukkola & Josephine R. Brown, 2020. "The role of climate variability in Australian drought," Nature Climate Change, Nature, vol. 10(3), pages 177-179, March.
    3. Xue Feng & Amilcare Porporato & Ignacio Rodriguez-Iturbe, 2013. "Changes in rainfall seasonality in the tropics," Nature Climate Change, Nature, vol. 3(9), pages 811-815, September.
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