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A residential rainwater and greywater system : a case study for suburban Darwin

Zhu, Herui (2017). A residential rainwater and greywater system : a case study for suburban Darwin. Bachelor of Engineering Co-op (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Zhu, Herui
Title A residential rainwater and greywater system : a case study for suburban Darwin
Institution Charles Darwin University
Publication Date 2017-06
Thesis Type Bachelor of Engineering Co-op (4th Year Project)
Supervisor Fairfield, Charlie A.
Gray, Patrick
Thennadil, Suresh
Abstract Darwin’s potable reticulated water supply system relies on climate-dependent sources. Factors such as a high rate of evaporation and the uncertain reliability of wet season rainfall are significant risks. This study investigates whether alternative sources of water within residential properties, such as rainwater and greywater may potentially help to reduce reliance on potable water for non-potable uses in the Darwin region.

Residential greywater, that relatively clean wastewater from the laundry, bathroom taps, and shower can be diverted for irrigation purposes; rainwater can be collected for indoor uses such as laundry and toilet flushing, however, there is neither sufficient theoretical, nor practical, research available to assess the viability of these systems in a wet-dry tropical climate, and in particular, within suburban Darwin.

A case study is being conducted under the auspices of Power and Water Corporation’s Living Water Smart programme to investigate the practical implementation of domestic rainwater and greywater recycling and re-use systems in a suburban household. The effectiveness, affordability, safety, and amenity of the systems are assessed.

By measuring water supplied and drinking water, rainwater, and greywater used at the site, a water balance is established for the household. Rainfall and roof catchment data are collected to determine rainwater tank water supply volumes and capacity. Other meteorological data including temperature, rate of evaporation, and relative humidity are collected to investigate their influences on water use, and in particular, irrigation demand. A water-balance model is developed to inform development of water efficiency rebates, incentives, and water-user decisions; a cost-benefit model is established to that end. The possibility of promoting water efficiency outcomes of the case study to the Darwin region community is explored.
Keyword rainwater tank
greywater reuse
residential water supply
water security
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Created: Tue, 04 Jul 2017, 08:59:31 CST by Jessie Ng