Rainwater is an alternative and sustainable source of water which is in compliance with the idea of sustainable development. Risk analysis helps us to identify the risks associated with the rainwater harvesting (RWH) in general. In this article we identify that parts of the RWH system where potential hazardous events could occur. The potential hazardous events are
evaluated by risk analysis and the most hazardous parts of the system are designated. Well known Water Safety Plan and semi-quantitative approach was used as a template for risk analysis. This method was verified by various mathematical methods as described in this article.
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