Sustainable Water Supply in Buildings Through Rooftop Rainwater Harvesting

  • Chidozie Charles NnajiEmail author
Conference paper


This paper used a combination of theoretical concepts, literature review and real-life survey to establish the need for a global and aggressive adoption of rainwater harvesting (RWH) as sustainable means of water supply and flood control. The ideas presented in this paper were aimed at making RWH systems an integral part of building conception and design as well as enshrining compulsory RWH in national building codes. In areas of adequate rainfall, RWH can supply up to 100% of domestic water needs of bungalow dwellers. Non-reactive roofs such as aluminium roofing sheets were found to be more suitable for RHW than asbestos, galvanized roofing sheets and concrete roofs. RWH can be made more sustainable and cost-effective by using mass balance and optimization methods for providing adequate storage for harvested water. Simple point-of-use treatment methods such WaterGuard® and Purifier of Water® can be used to render harvested water potable.


Rainwater harvesting Water supply Rainfall Roof Storage tank 


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Department of Civil EngineeringUniversity of NigeriaNsukkaNigeria
  2. 2.Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgJohannesburgSouth Africa

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