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A common characteristic of bioretention cells is that they have shallow earthen slopes, less than 2H:1V.
The design of a bioretention cell allows for several different planting zones.
Bioretention cells are suited for institutional, commercial, industrial, and residential multi-unit/multi-story land-uses.
They are can be sited in large landscaped areas, parks, parking lot islands, or any areas where there is space for shallow earthen slopes and the multi-zone planting aesthetic is appropriate.
==Drainage Areas==
There are two basic categories:
#Exposure to roadway or parking lot runoff. Runoff is contaminated with deicers and vehicle pollutants. These can take on several forms, including parking lot islands, traffic islands, roundabouts, or cul-de-sacs and are often used as [[snow]] storage location
#*Select salt tolerant grasses, other herbaceous material and shrubs.
#No exposure to roadway or parking lot runoff. These receive runoff from rooftops or areas that use no deicing salt and have low pollutant exposure, such as courtyard bioretention.
#*Practices allow for a greater range of species selection.
Other selection factors:
*Most bioretention cells will be situated to receive full sun exposure.
*Facilities with a deeper media bed (greater than 1 m) provide the opportunity for a wider range of plant species (including [[trees]]).
*The inclusion of vegetation with a variety of moisture tolerances ensures that the bioretention cell will adapt to a variety of weather conditions.
*Proper spacing must be provided for above-ground and below-ground utilities, and adjacent infrastructure.
Selection of plant species suited to tolerate the varied conditions common to green infrastructure is essential for the success of a planting plan. A plant’s ability to tolerate flood conditions is further correlated to its age, adaptation to the site, and condition. A well-established plant has greater reserves to withstand flood events. While it is recommended to leave the LID practice offline until plants become established (one to several years), in most instances this may not feasible. Measures incorporated into the LID practice such as erosion and sediment controls and pre-treatment cells can moderate flows enhancing survival potential. In all cases, soil surfaces must be stabilized prior to allowing flow to enter the LID facility.
Selection of plant species suited to tolerate the varied conditions common to green infrastructure is essential for the success of a planting plan. A plant’s ability to tolerate flood conditions is further correlated to its age, adaptation to the site, and condition. A well-established plant has greater reserves to withstand flood events. While it is recommended to leave the LID practice offline until plants become established (one to several years), in most instances this may not feasible. Measures incorporated into the LID practice such as erosion and sediment controls and pre-treatment cells can moderate flows enhancing survival potential. In all cases, soil surfaces must be stabilized prior to allowing flow to enter the LID facility.