1 / 17

Bioretention Design

Bioretention Design. Getting the Details Right. Page 30. Coordination of Plans. Curb elevations, grade breaks, architectural plans consistent with delineation of DMAs Harvesting and Reuse Drainage to Cisterns Cisterns Distribution piping

miette
Download Presentation

Bioretention Design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bioretention Design Getting the Details Right

  2. Page30 Coordination of Plans • Curb elevations, grade breaks, architectural plans consistent with delineation of DMAs • Harvesting and Reuse • Drainage to Cisterns • Cisterns • Distribution piping • Bioretention facilities are level so they “fill up like a bathtub.”

  3. DMAs with Grading Shaded

  4. Pedestrian Access, Utilities

  5. Visual Impacts, planting plans

  6. Call out elevations • Outlet structure • Top of overflow grate • Underdrain connection • Inlet • Flow line at inlet • Top of curb • Top of adjacent paving • Soil layers • Top of soil layer • Bottom of gravel layer • Bottom of soil layer

  7. Structural 15"

  8. Structural

  9. Grading and Paving

  10. Grading

  11. Roof leaders

  12. Inlets

  13. Page76 Outlets Overflow elevation

  14. Fixing a low outlet grate

  15. Gravel and Underdrain • Class 2 permeable • Caltrans spec 68-1.025 • Typical to be slightly off gradation spec on delivery • No filter fabric • Underdrain • Near top of gravel layer • PVC SDR 35 or equivalent; holes facing down • Solid pipe for 2' closest to outlet structure • Cleanout

  16. Soil Specification • 60-70% Sand • ASTM C33 for fine aggregate • 30-40% Compost • Certified through US Composting Council Seal of Testing Assurance Program • Submittal per Guidebook • Option to accept test results for a “brand-name” mix if volume is less than 100 cubic yards • Install in 8"-12" lifts • Do not compact • Do not overfill • Leave room for mulch

  17. Plantings • Maintain design top of soil elevation • Trees • Incorporate into bioretention facility • Account for surface roots

More Related