E5.1Update on-site rainwater management requirements

On-site rainwater management plays a critical role in mitigating the impacts of impervious surfaces and the increasing rainfall intensity caused by climate change. Strategies such as drainage swales, porous driveways, and detention ponds help manage rainwater effectively. Currently, the City requires stormwater control plans for new development applications to demonstrate how rainwater will be managed on-site.

This action involves reviewing and updating the City’s on-site rainwater management requirements to address projected increases in rainfall intensity and the prevalence of impervious surfaces in new developments. Enhanced requirements will provide more opportunities for rainwater to be absorbed by vegetation and infiltrated into the ground, reducing the frequency and severity of flooding events. Additionally, improved management practices will help prevent harmful rainwater pollutants from entering Surrey’s waterways and strengthen the resilience of the City’s drainage system against future climate impacts.