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Green infrastructure, often referred to as GI, offers an effective approach to managing stormwater pollution by leveraging natural elements such as natural vegetation and soils to mimic natural water management processes. This process aids in the reduction of stormwater runoff and enhances urban environments by promoting healthier communities. In September 2019, the Board of Supervisors approved the County’s Green Infrastructure Plan (PDF), which outlines strategies for integrating green infrastructure into unincorporated areas of the County.
Benefits of Green Infrastructure
Natural Filtration
GI features act as in ground filters to reduce pollutants that can be transported by water. When polluted water enters a GI feature, it goes through different filtration stages where pollutants are left behind before entering a waterbody.
Keeps Water Local
GI features capture water that flows into them and allows the water to slowly percolate and filter before entering a waterbody. This means that water in a GI feature can be used to water rain gardens or even recharge groundwater.
Increases Vegetation
GI features use native vegetation which attract pollinators and wildlife beneficial to the area. Think birds, frogs, and even butterflies!
Reduces Flooding
GI Features help manage stormwater runoff during rain events by slowing the flow of water and giving the water a place to drain to, other than a storm drain which can often be clogged with debris during storms.
Lowers Heat Island Effect
GI features, like most vegetative and planted features, will aid in cooling down urban areas by deflecting sun radiation. An added bonus if trees are part of the feature because as they grow the shade they provide will reduce temperatures!
