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Grading & Drainage Design

Grading & Drainage Design. for Bioretention Facilities. Dan Cloak Environmental Consulting May 23, 2011. Overview. Consider drainage early in the design process Find suitable sites for bioretention Use roof plans and grading/paving plans to analyze and display drainage management areas

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Grading & Drainage Design

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  1. Grading & Drainage Design for Bioretention Facilities Dan Cloak Environmental ConsultingMay 23, 2011

  2. Overview • Consider drainage early in the design process • Find suitable sites for bioretention • Use roof plans and grading/paving plans to analyze and display drainage management areas • Distribute bioretention through the site • Grade to distribute drainage to among inlets • Use the head from roof leaders to move roof runoff • Avoid utility conflicts

  3. Consider Drainage Early

  4. Suitable Sites • Find suitable sites for bioretention • Downgradient • Unbuildable • Aesthetic

  5. Roof and Grading Plans • Drainage area includes portions of roof and of parking lot

  6. Distribute through the site • Facilitates mimicking pre-development hydrology of site • Keeps drainage runs short and shallow • Avoid creating barriers to circulation

  7. Distribute throughout site

  8. Distribute throughout site • On steep sites consider: • Integrating bioretention facilities with terracing • Collecting runoff in the conventional way and piping to bioretention facilities at the base of the slope

  9. Distribute runoff • Avoid conventionally swaled pavement

  10. Tightline Roof Leaders • Use the head from roof leaders to move roof runoff

  11. Utility Conflicts • Avoid conflicts with existing underground utilities • Avoid conflicts with newly installed utilities

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