Last edited 09 Dec 2020

Precautionary principle

The Green Book, Central Government Guidance On Appraisal And Evaluation, Published by HM Treasury in 2018, suggests the precautionary principle: ‘…refers to the concept that where the potential consequences of a perceived risk are significantly adverse, action may still be justified even if the probability of occurrence is low.’

Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, suggests the precautionary principle (or precautionary approach): ‘…enables decision-makers to adopt precautionary measures when scientific evidence about an environmental or human health hazard is uncertain and the stakes are high.’

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