Common inlet types include turf grass (sod) strips and rock riprap.
Common problems associated with these inlet types include:
Build up of the sod at the curb-cut inlet can restrict runoff from entering the bioretention area, particularly for low flows, thereby eliminating any water quality benefit.
Improperly sized or installed riprap can lead to erosion and undermining of the adjacent curb and gutter.
Removal of accumulated sediment requires hours of maintenance or replacement of the inlet.
Sediment not captured by effective pretreatment enters the basin, stresses the plant community, and reduces infiltration capacity.
