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LID installations protect water quality, reduces flooding, and adds aesthetic landscape elements. Most LID slows down stormwater, giving it time to absorb into the local soils, sometimes getting filtered by attractive raingarden plantings, and into the aquifers that so many cities rely on.

It might be required by your permit
Most stormwater permits have an LID requirement. For businesses, please visit the Stormwater Permits Webpage. Municipalities have their own set of stormwater requirements, which can be found on the Municipal Permit Information Page.

It can reduce pollution
There are ongoing studies on the effects of stormwater on the environment, and the news is not good for stormwater that has not received even the most basic of filtration. This can have an impact on the health of wildlife, such as salmon, and the overall health of a watershed.

It can reduce flooding
Without a way to slow the flow of stormwater and give it time to infiltrate into the ground, stormwater can overwhelm the aging stormwater infrastructure and flood basements, yards, and roads.

Short-term costs equal long-term savings

A properly installed LID structure can reduce pollutants, volume, and flow of stormwater leaving a site. This can alleviate pressure on aging infrastructure, allowing municipalities and utilities more time to repair and replace old pipes and culverts, instead of washing away roads and flooding highways. For homeowners, a properly maintained raingarden could increase property value, while rain catchment structures reduce the water bill by providing the water for irrigation. While the up-front costs of such installations can be at times staggering, there are potential grants available.

It can assist in securing a safe drinking water supply
With Climate Change and recent record-breaking droughts, ensuring that stormwater stays where it falls--and infiltrates into aquifers--is incredibly important. Several municipalities mine aquifers for their water supply, as do a wide variety of farms.
 
People are starting to ask for it
A properly maintained LID installation can be the highlight of a community park or urban roadside. While environmental education is on the rise, it's hard to deny the aesthetic appeal of a tree-shaded sidewalk and open green spaces with islands of densely planted bioretention. LID certainly can look better than a sterile sidewalks and rusted iron stormwater grates.

It makes cities act more like the surrounding landscapes

The heat island effect can be a huge concern, especially with Climate Change and record-breaking summer heat. Without areas of green, the concrete and roofs of cities absorb heat and release it during the night. This makes the city hotter than the surrounding areas, driving up the cost of air conditioning.