What are bioretention basins?
What are bioretention basins?
Bioretention basins are landscaped depressions or shallow basins used to slow and treat on-site stormwater runoff. Stormwater is directed to the basin and then percolates through the system where it is treated by a number of physical, chemical and biological processes.
How do you size a bioretention basin?
The minimum size for any bioretention facility should be 10 feet wide (perpendicular to incoming sheet flow direction) and 15 feet long. The depth of the facility’s planting soil (reference Figure 11.1) should be approximately 30 inches, or the diameter of the largest plant root ball plus 4 inches.
How does a bioretention system work?
A bioretention system consists of a soil bed planted with suitable non-invasive (preferably native) vegetation. Vegetation in the soil planting bed provides uptake of pollutants and runoff and helps maintain the pores and associated infiltration rates of the soil in the bed.
What is bioretention project?
Bioretention planters are planted depressions designed to collect and absorb stormwater runoff from nearby paved surfaces like streets and sidewalks. They combine engineered stormwater control and treatment with aesthetic landscaping.
What is a dry detention pond?
Dry detention ponds, also known as “dry ponds” or “detention basins”, are stormwater basins designed to capture, temporarily hold, and gradually release a volume of stormwater runoff to attenuate and delay stormwater runoff peaks.
What is the difference between a retention basin and a detention basin?
The Difference Between Detention and Retention Ponds A detention, or dry, pond has an orifice level at the bottom of the basin and does not have a permanent pool of water. A retention basin or pond has a riser and orifice at a higher point and therefore retains a permanent pool of water.
What is bioretention soil?
Bioretention cells are depressions in the landscape that capture stormwater before it can enter waterways. Bioretention soils must have sufficient infiltration rates to prevent ponding on the surface for over 48 hours. Traditionally, bioretention soils are made up of three components: sand, soil and compost.
What is the purpose of a Bioswale?
Bioswales are vegetated, shallow, landscaped depressions designed to capture, treat, and infiltrate stormwater runoff as it moves downstream.
What is a Filterra?
Filterra is a specially engineered stormwater treatment system incorporating high performance biofiltration media to remove pollutants from stormwater runoff. All components of the system work together to provide a sustainable long-term solution for treating stormwater runoff.
What is the difference between retention and detention ponds?
Which is the best definition of a bioretention basin?
Bioretention Basins/Rain Gardens. Definition: A bioretention area or rain garden is a shallow planted depression designed to retain or detain stormwater before it is infiltrated or discharged downstream.
How is stormwater filtered in a bioretention system?
Stormwater runoff entering the bioretention system is filtered first through the vegetation and then the sand/soil mixture before being conveyed downstream by the underdrain system. Runoff storage depths above the planting bed surface are typically shallow.
How much does it cost to build a bioretention basin?
Bioretention basins are relatively expensive to build ranging from $5,000 to $10,000 per acre drained (dated-2000). Another suggested approach is to use a cost factor of $3 -$15 per square foot of bioretention surface area. Some variables impacting costs include: Landscape and type of soil found at proposed site (site conditions).
What kind of pipe is used for bioretention?
PVC SDR 35 PERFORATED PIPE, SEE CONSTRUCTION NOTE 4 LEGEND MULCH/COMPOST LAYER (SEE DESIGN NOTE 12) BIORETENTION SOIL MEDIA (BSM) AGGREGATE NATIVE SOIL ASPHALT PAVEMENT CONCRETE CURB INLET DETAIL SW-18, GUTTER INLET ELEV. (GIE) CURB AND GUTTER DETAIL SW-12A