Low Impact Development (LID)

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Presentation transcript:

Low Impact Development (LID)

LID Approaches Preserve Existing Vegetation Restoring Roadside Landscape Porous Materials Minimizing Impervious Area LID Approaches Retrofit existing Stormwater Features Maintain Infiltration Patterns Maintain Sheet Flow, Dispersion patterns

PRESERVE EXISTING VEGETATION

RETROFIT OR RESTORE USING A SOIL AMENDMENT

VEGETATED SIDE SLOPE RETROFITTED WITH A SOIL AMENDMENT BEFORE AFTER

SLOPE RETROFITTED WITH A SOIL AMENDMENT BEFORE AFTER

FLAT BOTTOM CHANNEL WITH A SOIL AMENDMENT ADDED

RESHAPED CHANNEL AND INSTALLING SOIL AMENDMENT BEFORE AFTER

Treatment Solution Selection Sufficient LIDs Incorporated? Treatment Solution Selection For project with identified water Issues and treatment goals Incorporate LID techniques such as soil amendments, impervious surface reduction, preserving or restoring adjacent roadway landscaping Y N Select appropriate treatment based on: BMP removal capabilities Constructability Cost and maintenance Site constraints (steep Slopes, high groundwater, Bedrock, etc) Go to Stormwater Management Tech Bulletin and attached Water Quality Guidance LIDs and/or Engineered Treatment option used To meet treatment goals Water Quality Selection Complete Y BMP selected from Recommended list From Water Quality Guidance/Tech Bulletin? Y Re-Submit deviation for for other BMP not listed in Water Quality Guidance/Tech Bulletin with supporting documentation Sufficient design? Submit hydraulic Design Deviation for other BMP not listed in Water Quality Guidance/Tech Bulletin with supporting documentation N N 9

Design Guidance Stormwater Management Tech Bulletin (GE-09-02B) LID Guidance Under Development

LID Guidance Site considerations LID Types Site Constraints Selection Process Operation and Maintenance Sizing Criteria