Bioretention swales, planters, and biofiltration planters can be integrated into medians where width allows.
Uninterrupted linear street space may manage large volumes of runoff from adjacent pavement or areas upstream collected from multiple blocks.
Median bioretention facilities utilize potentially unused space in the right-of-way, and can repurpose that space into multi-functional street space by providing greenscape and stormwater infrastructure.
Median cells may be very high capacity stormwater facilities (depending upon right-of-way space), as access is more easily limited.
Medians tend to be at the high point of a road’s cross slope; thus, street runoff is typically not sheet flowing to a median. As a result, bioretention facilities sited in medians may require reversing a street’s cross slope in order to intercept the adjacent street’s runoff.
If the street’s cross section can not be modified, review opportunities to intercept stormwater collected in an upstream conveyance system (from other street) and having it daylight into a series of bioretention facilities in the median.
Sewer mains and other underground utilities tend to be located in the middle of a roadway and may need to be relocated.
Consider street sweeping, plowing, and snow storage in colder climates. Snow that is not removed may be stored in the median, which can impact plant health and facility durability. De-icing chemicals, salt, and sand may also impact tree and vegetation health, especially if over-applied.