Water, water, everywhere. Quantifying possible domestic water demand savings through the use of rainwater collection from residential roofs in Auckland, New Zealand

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Conference Proceeding
7th International Conference on Urban Drainage Modelling (UDM) and the 4th International Conference on Water Sensitive Urban Design (WSUD), Book of Proceedings, 2006, 2 pp. 403 - 410
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Current residential sector growth rates in the Auckland Region are expected to impose increased demands on domestic water supply. This paper attempts to quantify, for four typical roof areas (100 m2, 150 m², 200 m², and 250 m²), the potential savings associated with domestic water supply from roof rainwater collection systems compared with using the city water supply system. The effects of trying to meet existing water demand figures are compared with what could be achieved by the promotion of flexibility in altering demands through technical and behavioural changes of the residents. Each of the four roof areas is examined under two scenarios. In the first scenario, the ability of the roof-collected water to meet conventional water demands is assessed, while in the second scenario the effects of water-saving techniques are assessed for their potential to allow households to achieve self-sufficiency in domestic water supply. The research takes into account the electrical energy used in delivering the city and on-site domestic water supply, water line-maintenance costs, network upgrades, and other charges for residential buildings compared with the capital and operating costs of using complete rainwater supply from roofs of houses.
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