Which of the following is a best practice for stormwater management to protect water quality?

• A. Conventional grey infrastructure only.
• B. Green infrastructure (bioswales, rain gardens), permeable pavement, and street sweeping plus spill prevention and education.
• C. Removing vegetation to reduce clogging.
• D. Increasing impervious surfaces.

Answer: (B)

The main idea is that protecting water quality from stormwater requires treating and reducing pollutants before runoff reaches waterways, not just moving water away. The best practice combines green infrastructure with practical maintenance and prevention. Bioswales and rain gardens capture and infiltrate runoff, allowing sediments, nutrients, and other pollutants to be filtered and broken down by soils and microbes. Permeable pavement further reduces runoff volume and provides filtration as water passes through. Street sweeping removes loose debris, sediment, oils, and metals from roads before they’re carried into drains, while spill prevention and education reduce the chances of contaminant releases and promote practices that minimize pollution. Together, these elements slow, filter, and clean runoff at multiple stages, support groundwater recharge, and reduce pollutant loads entering streams.

Relying on conventional grey infrastructure alone mostly addresses conveyance and storage, not water quality. Removing vegetation eliminates natural filtration and root systems that help trap sediments and stabilize soils, often increasing erosion. Increasing impervious surfaces raises runoff quantity and speeds transport of pollutants into waterways.