Bioretention: Construction

This section is also applicable to: Bioswale Rain garden

Construction Tasks Table

Construction Task	Bioretention	Bioswale	Rain garden
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Construction Tasks Described

Verification of Siting and LID Design

Installation of ESC and Construction Fencing ESC Inspection and Maintenance (ongoing) Clearing and Grubbing Excavation Rough Grade Verification of Grading/Survey* Scarification Geotextile Impermeable liner Underdrain Overflow or Overflow Drain Monitoring well Storage Reservoir Stone Choker Layer Curbing Pre-treatment and Inlet Soil Media / Filter Media Finish Grading Riprap (Large Stone) Plant Material Verification and Installation Mulch Placement Stabilizing Contributing Drainage Area - Planting Adjacent Vegetation As-built Survey Permanent Fencing Identify and Address Deficiencies Assumption/Certification

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

Linear bioretention cell designed to convey, treat and attenuate stormwater runoff. The engineered filter media soil mixture and vegetation slows the runoff water to allow sedimentation, filtration through the root zone, evapotranspiration, and infiltration into the underlying native soil.

A lot level bioretention cell designed to receive and detain, infiltrate and filter runoff, typically used for discharge from downspouts.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

Filter fabric that is installed to separate dissimilar soils and provide runoff filtration and contaminant removal benefits while maintaining a suitable rate of flow; may be used to prevent fine-textured soil from entering a coarse granular bed, or to prevent coarse granular from being compressed into underlying finer-textured soils.

A perforated pipe used to assist the draining of soils.

a top dressing over vegetation beds that provides suppresses weeds and helps retain soil moisture in bioretention cells, stormwater planters and dry swales.