L.I.D. - AAck! Another Acronym. FWIW, FYI, in this article LID is short for “Low Impact Development”. Simply put, LID is used in both site development and in landscaping around homes to mimic natural water flow and absorption. LID helps to reduce stormwater runoff and increases infiltration and natural filtering of rain, returning clean water to the aquifers.



Why Is LID important?


The native soils and forest of the islands store, filter, and slowly release cool, clean water to streams, wetlands, and the Salish Sea around us. The rich diversity of life in marine and fresh water, as well as on land, depends on clean water to thrive. As the population of the islands grows, native forests and soils are replaced with driveways, rooftops and other hard surfaces. When it rains, more water flows from these surfaces than undisturbed areas, carrying oil, fertilizers, pesticides, sediment and other pollutants downstream. In fact, much of the pollution in streams, wetlands and marine waters now comes from stormwater (water flowing off developed areas).  The added volume of water and associated contaminants from developed land are damaging water resources and harming aquatic life.


We can make important contributions to reduce the amount of stormwater and pollutants coming from residential and commercial properties by incorporating LID techniques into both original site development and in existing yards and landscaping.



So, What Are Some of the LID Techniques?

L.I.D. - Beautiful and Effective

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Learn More about LID  - Local Resources and Information


The San Juan Islands Conservation District is a great resource with published information and consultants to help individuals and contractors learn more about Low Impact Development techniques.  360-378-6621 http://www.sanjuanislandscd.org


The Washington State University has good information on their Pierce county website at http://www.pierce.wsu.edu/Water%5FQuality/LID/


Choose a contractor or landscape architect that is skilled in LID. Many local contractors are becoming knowledgeable about LID techniques.

Some LID techniques are simply preservation of the natural systems:

Preserving open space and minimizing land disturbance

Protecting and incorporating natural systems (wetlands, streams, wildlife, forests) as design elements

Specific techniques include:

Rain

Gardens

Stormwater directed to these shallow depressions in the landscape is filtered stored, and infiltrated into the ground using specialized vegetation and good soils.

Grassed Swales

Water moving through these systems is slowed, filtered, and percolated into the ground. These systems can act as low cost alternatives to curbs, gutters, and pipes.

Permeable Pavement

Driveable Surfaces are created from porous concrete or paving grids of concrete or other materials. Water filters through instead of running off.

Rainwater Collection Systems

Vegetated Roofs

Rainwater is routed via house gutters to storage tanks and released slowly later for gardening or domestic use

Generally seeded with sedum, green roofs have a thin soil layer over a membrane with an integrated “drainage layer”. Stormwater runoff is reduced, and often eliminated during

light rainfalls.