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Climate Change Impacts on Rainwater Tank’s Potential Water Savings, Efficiency and Reliability Presenting Relationship Between ‘Seasonality Index’ and Water Savings Efficiency

Author

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  • Monzur A. Imteaz

    (Swinburne University of Technology)

  • Mohammad S. Khan

    (Swinburne University of Technology)

  • Abdullah G. Yilmaz

    (La Trobe University)

  • Abdallah Shanableh

    (University of Sharjah)

Abstract

The paper presents potential impacts of climate change on rainwater tanks outcomes such as water savings, reliability and water savings efficiency under two projected climate change scenarios; RCP4.5 and RCP8.5 utilising a case study using rainfall data from four stations within the city of Brisbane, Australia. Historical rainfall data were collected from the Australian Bureau of Meteorology website for the selected stations. Projected daily rainfall data were collected from Australian government data portal for the same stations within Brisbane. Using an earlier developed daily water balance model, eTank potential annual water savings were calculated for several weather and climate change scenarios with varied roof areas and rainwater demandValues of ‘Seasonality Index (SI)’, a commonly used factor representing rainfall variability within a year, were explored to validate earlier developed relationships between SI and water savings efficiency through rainwater tanks. It is found that in most cases water savings in future periods are expected to decrease and such decrease is not necessarily attributed to the expected decrease in rainfall amounts in future, rather also affected by future reductions in rainwater tank reliability. Linear relationships between potential future water savings and reliabilities for all the stations are found. Relationship between SI and water savings efficiency was established, and it is found that the relationship slightly varies with an earlier developed relationship using historical data. Compared to earlier established relationship, for lower SI values water savings efficiency is expected to become better, while for higher SI values the water savings efficiency is expected to become worse. Also, an increase of roof area from 100 m2 to 200 m2 will cause an average increase of water savings efficiency by 25% and an increase of rainwater usage from 200 L/day to 300 L/day will cause an average increase of water savings efficiency by 20%.

Suggested Citation

  • Monzur A. Imteaz & Mohammad S. Khan & Abdullah G. Yilmaz & Abdallah Shanableh, 2023. "Climate Change Impacts on Rainwater Tank’s Potential Water Savings, Efficiency and Reliability Presenting Relationship Between ‘Seasonality Index’ and Water Savings Efficiency," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(11), pages 4345-4361, September.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:11:d:10.1007_s11269-023-03556-3
    DOI: 10.1007/s11269-023-03556-3
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    References listed on IDEAS

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    1. 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.
    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.
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