Bioretention Design Getting the Details Right. Coordination of Plans Curb elevations, grade breaks, architectural plans consistent with delineation of.

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Presentation transcript:

Bioretention Design Getting the Details Right

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.” Page 30

DMAs with Grading Shaded

Pedestrian Access, Utilities

Visual Impacts, planting plans

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 Call out elevations

Structural 15"

Structural

Grading and Paving

Grading

Roof leaders

Inlets

Outlets Overflow elevation Page 76

Fixing a low outlet grate

Class 2 permeable ● Caltrans spec ● 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 Gravel and Underdrain

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

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