Abstract
Abstract The study analyses possibilities of PHA (Preliminary Hazard Analysis) usage in ecological risk assessment conducted within technical risk assessment. The analysis was performed based on results obtained in a study performed between 2007 and 2013 in natural and modified lowland Lower Silesian watercourses. The object of the study was communities of hydromacrophytes being good indicators of the water ecosystem quality. The research constituted a base for the determination of ecological risk factors i.e. the probability of hazard occurrence and its effects. It allowed for the acquisition of the risk classification matrix which included three levels - low, medium and high.
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