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;Adsorption
:The attachment of gas, vapour or dissolved matter onto the surface of solid materials.
;Aggregate
;Aggregate
:A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.
:A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.
;Interevent time
;Interevent time
:The period of time between consecutive rainfall events.
:The period of time between consecutive rainfall events.
;Aquifer
:Layer fo rock or soil that holds or transmits water.
;Asphalt
:A mixture of mineral aggregates bound with bituminous materials, used in the construction and maintenance of paved surfaces.
;Attenuation
:Reduction of peak flow and increase of the duration of the flow event.
;Base flow
:The sustained flow in a channel due to groundwater interaction.
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;Berm
;Berm
;Biofilter
;Biofilter
:A bioretention BMP featuring an impermeable liner and underdrain that prevents infiltration of runoff into the underlying native soil; provides sedimentation and filtration of urban runoff as it passes through the mulch layer, engineered filter media and vegetation root zone.
:A bioretention BMP featuring an impermeable liner and underdrain that prevents infiltration of runoff into the underlying native soil; provides sedimentation and filtration of urban runoff as it passes through the mulch layer, engineered filter media and vegetation root zone.