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Low Impact Development (LID)

Low Impact Development (LID). 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.

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Low Impact Development (LID)

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  1. Low Impact Development (LID)

  2. 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

  3. PRESERVE EXISTING VEGETATION

  4. RETROFIT OR RESTORE USING A SOIL AMENDMENT

  5. VEGETATED SIDE SLOPE RETROFITTED WITH A SOIL AMENDMENT BEFORE AFTER

  6. SLOPE RETROFITTED WITH A SOIL AMENDMENT BEFORE AFTER

  7. FLAT BOTTOM CHANNEL WITH A SOIL AMENDMENT ADDED

  8. RESHAPED CHANNEL AND INSTALLING SOIL AMENDMENT BEFORE AFTER

  9. 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

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

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

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