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Reliability analysis of rainwater tanks: A comparison between South-East and Central Melbourne

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  • Imteaz, Monzur Alam
  • Rahman, Ataur
  • Ahsan, Amimul

Abstract

A spreadsheet based daily water balance model is used for the performance analysis and design optimisation of rainwater tanks at two different regions of Melbourne, South-East and Central Melbourne. These two different regions of Melbourne are characterised by notable different topography and rainfall characteristics. From historical rainfall data, three representative years (dry, average and wet) are selected. Reliability is defined as percentage of days in a year when rainwater tank is able to supply the intended partial demand for a particular condition. For the three climatic conditions, a number of reliability charts are produced for domestic rainwater tanks in relations to tank volume, roof area, number of people in a house (i.e. water demand) and percentage of total water demand to be satisfied by the harvested rainwater. It is found that for a relatively small roof size (100m2), 100% reliability cannot be achieved even with a very large tank (10,000L). Reliability becomes independent of tank size for tank sizes larger than 5000–7000L depending on the location. This is defined as threshold tank size, relationships with threshold tank sizes and annual rainfall amounts are then established for both the locations. It is found that for a particular annual rainfall amount, threshold tank size for South-East Melbourne is higher than that of Central Melbourne. However, for a relatively large roof size (200m2), approximately 90% reliability can be achieved with a tank size of 10,000L and with further increase in tank size, a 100% reliability is achievable, except in a dry year. Furthermore, it is found that reliabilities for South-East Melbourne maintain consistent higher values as compared to Central Melbourne.

Suggested Citation

  • Imteaz, Monzur Alam & Rahman, Ataur & Ahsan, Amimul, 2012. "Reliability analysis of rainwater tanks: A comparison between South-East and Central Melbourne," Resources, Conservation & Recycling, Elsevier, vol. 66(C), pages 1-7.
    • Handle: RePEc:eee:recore:v:66:y:2012:i:c:p:1-7
    DOI: 10.1016/j.resconrec.2012.05.009
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    References listed on IDEAS

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    1. Muthukumaran, Shobha & Baskaran, Kanagaratnam & Sexton, Nicole, 2011. "Quantification of potable water savings by residential water conservation and reuse – A case study," Resources, Conservation & Recycling, Elsevier, vol. 55(11), pages 945-952.
    2. Eroksuz, Erhan & Rahman, Ataur, 2010. "Rainwater tanks in multi-unit buildings: A case study for three Australian cities," Resources, Conservation & Recycling, Elsevier, vol. 54(12), pages 1449-1452.
    3. Ghisi, Enedir & Tavares, Davi da Fonseca & Rocha, Vinicius Luis, 2009. "Rainwater harvesting in petrol stations in Brasília: Potential for potable water savings and investment feasibility analysis," Resources, Conservation & Recycling, Elsevier, vol. 54(2), pages 79-85.
    4. Imteaz, Monzur Alam & Adeboye, Omotayo B. & Rayburg, Scott & Shanableh, Abdallah, 2012. "Rainwater harvesting potential for southwest Nigeria using daily water balance model," Resources, Conservation & Recycling, Elsevier, vol. 62(C), pages 51-55.
    5. Imteaz, Monzur Alam & Ahsan, Amimul & Naser, Jamal & Rahman, Ataur, 2011. "Reliability analysis of rainwater tanks in Melbourne using daily water balance model," Resources, Conservation & Recycling, Elsevier, vol. 56(1), pages 80-86.
    6. Imteaz, Monzur Alam & Shanableh, Abdallah & Rahman, Ataur & Ahsan, Amimul, 2011. "Optimisation of rainwater tank design from large roofs: A case study in Melbourne, Australia," Resources, Conservation & Recycling, Elsevier, vol. 55(11), pages 1022-1029.
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    1. Moreira Neto, Ronan Fernandes & Carvalho, Isabella de Castro & Calijuri, Maria Lúcia & Santiago, Aníbal da Fonseca, 2012. "Rainwater use in airports: A case study in Brazil," Resources, Conservation & Recycling, Elsevier, vol. 68(C), pages 36-43.
    2. Imteaz, Monzur Alam & Ahsan, Amimul & Rahman, Ataur & Mekanik, Fatemeh, 2013. "Modelling stormwater treatment systems using MUSIC: Accuracy," Resources, Conservation & Recycling, Elsevier, vol. 71(C), pages 15-21.
    3. Imteaz, Monzur Alam & Ahsan, Amimul & Shanableh, Abdallah, 2013. "Reliability analysis of rainwater tanks using daily water balance model: Variations within a large city," Resources, Conservation & Recycling, Elsevier, vol. 77(C), pages 37-43.
    4. Bocanegra-Martínez, Andrea & Ponce-Ortega, José María & Nápoles-Rivera, Fabricio & Serna-González, Medardo & Castro-Montoya, Agustín Jaime & El-Halwagi, Mahmoud M., 2014. "Optimal design of rainwater collecting systems for domestic use into a residential development," Resources, Conservation & Recycling, Elsevier, vol. 84(C), pages 44-56.
    5. Rostad, Nathan & Foti, Romano & Montalto, Franco A., 2016. "Harvesting rooftop runoff to flush toilets: Drawing conclusions from four major U.S. cities," Resources, Conservation & Recycling, Elsevier, vol. 108(C), pages 97-106.
    6. Rashidi Mehrabadi, Mohammad Hossein & Saghafian, Bahram & Haghighi Fashi, Fereshte, 2013. "Assessment of residential rainwater harvesting efficiency for meeting non-potable water demands in three climate conditions," Resources, Conservation & Recycling, Elsevier, vol. 73(C), pages 86-93.
    7. Silva, Marcos Dornelas Freitas Machado e & Calijuri, Maria Lúcia & Sales, Francisco José Ferreira de & Souza, Mauro Henrique Batalha de & Lopes, Lucas Sampaio, 2014. "Integration of technologies and alternative sources of water and energy to promote the sustainability of urban landscapes," Resources, Conservation & Recycling, Elsevier, vol. 91(C), pages 71-81.
    8. 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.

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