GUIDANCE FOR DESIGNERS & BUILDERS

THOSE MAKING DECISIONS FOR OTHERS

 

Recommended Guidelines For Infiltration-Based Practices To Achieve Better Water Quality In Metro Area Communities

May 2006, DRAFT

 

Recommended Guideline Contents

 Sizing FAIR Practices

Acknowledgements

Introduction / Purpose

Approved FAIR Practices

FAIR Credit Worksheets

Primary FAIR Practice Guidelines

Bioretention Cells

Bioswales

Dry Wells

Infiltration Trenches

Native Soil / Vegetation Preservation

Porous Pavement

Post-Construction Soil Quality Restoration

Rooftop Disconnection

Vegetated Filter Strips

Wet Ponds

Supporting FAIR Practice Guidelines

Engineered Planting Soil

Flow Splitter

Level Spreader

Pretreatment

Subsurface Drains

Vegetation for Final Stabilization

Quick Equation References for FAIR Practices

 

 

1)  Calculate how much rain you'd like to retain:

FAIR - 1/4 = drainage area (square feet) x .020 = cubic feet

FAIRER - 1/2" = drainage area (square feet) x .041 = cubic feet

FAIREST - 1" = drainage area (square feet) x .083 = cubic feet

 

Size the space required to infiltrate the desired rain event:

2) How much rain to you want to retain? 


3) How do you want to retain it? 

 
4) Enter two of the three dimensions to solve the third:

Width:  Length:  Depth: =

  Cubic Feet of Stored


 

 

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