1. Low Impact Development (LID)

2. 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

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. 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

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

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