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Line 305: − Simple (non-treating) [[inlets]] include:+ − + − + − + − For further guidance see [[Inlets]]+ + +
→Inlets
===Inlets===
===Inlets===
*Bioretention may receive runoff via overland sheet flow from a pavement edge or flush curb, concentrated overland flow from a gutter, curb opening or spillway, or as concentrated underground flow from an inlet pipe.
*Sheet flow from a pavement edge or flush curb
*Distribute concentrated inflows between multiple inlets or facilities and include flow spreading features to dissipate energy and avoid erosion of the filter media bed.
*One or more [[curb cuts]]
*For concentrated overland flow from roads, inlets should be located at all sag points in the gutter grade and immediately upgrade of median breaks, crosswalks and street intersections. Inlet types include curb openings, side inlet catch basins, trench drains and pre-fabricated inlet structures. Spillways aid in turning flow 30, 45 or 90 degrees into the practice. Incorporate concrete aprons at curb opening or spillway locations to increase inflow effectiveness. Provide a 50 to 100 mm drop in elevation between inlet invert and mulch or concrete apron surface.
*Covered drains
*For concentrated underground flow, inlets may include pipes from roof drains, catch basins, storm sewers, oil and grit separators (OGS) or outlet leader from an upstream best management practice.
See [[Inlets]] for further guidance.
===Pretreatment===
===Pretreatment===
Options for [[pretreatment]] include:
Options for [[pretreatment]] include: