Changes

;Adsorption  

;Adsorption ;adsorption

;adsorption

:The attachment of gas, vapour or dissolved matter onto the surface of solid materials.  

:The attachment of gas, vapour or dissolved matter onto the surface of solid materials.  

;Aggregate  

;Aggregate ;Aggregates  

;Aggregates  

;aggregate ;aggregates

;aggregate  

;aggregates

: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.

;Antecedent dry period  

;Antecedent dry period ;antecedent dry period

;antecedent dry period

;Interevent time ;interevent time

;Interevent time  

:The period of time between consecutive storms or rainfall events.

;interevent time

:The period of time between consecutive rainfall events.

;Aquifer  

;Aquifer ;Aquifers  

;Aquifers  

;aquifer ;aquifers  

;aquifer

;aquifers  

:Layer of rock or soil that holds or transmits water.  

:Layer of rock or soil that holds or transmits water.  

;Asphalt  

;Asphalt ;asphalt

;asphalt

:A mixture of mineral aggregates bound with bituminous materials, used in the construction and maintenance of paved surfaces.  

:A mixture of mineral aggregates bound with bituminous materials, used in the construction and maintenance of paved surfaces.  

;Attenuation  

;Attenuation ;attenuation

;attenuation

:Reduction of peak flow and increase of the duration of the flow event.  

:Reduction of peak flow and increase of the duration of the flow event.  

;Base flow  

;Base flow ;base flow

;base flow

:The sustained flow in a channel due to groundwater interaction.  

:The sustained flow in a channel due to groundwater interaction.  

;Basin

;Basin ;basin

;Basins

;Basins ;basins

;basins

:Ground depression acting as a flow control and water treatment structure, that is normally dry.  

:Ground depression acting as a flow control and water treatment structure, that is normally dry.  

;Berm

;Berm ;berm

;berm

:A compacted earthen wall that diverts runoff or creates shallow ponding of runoff. In some cases, runoff ponds behind the berm and gradually flows through it or is infiltrated.

:A compacted earthen wall that diverts runoff or creates shallow ponding of runoff. In some cases, runoff ponds behind the berm and gradually flows through it or is infiltrated.

;Biodegradation

;Biodegradation ;biodegradation

;biodegradation

:Decomposition of organic matter by micro-organisms and other living things.  

:Decomposition of organic matter by micro-organisms and other living things.  

;Biofilter

;Biofilter ;biofilter

:Biofilters

:Biofilters ;biofilters

;biofilters

: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.

:A bioretention cell that features an impermeable liner that collects and treats stormwater through sedimentation and filtration only (i.e., no infiltration).

:A bioretention cell that features an impermeable liner that collects and treats stormwater through sedimentation and filtration only (i.e., no infiltration).

;Bioretention

;Bioretention ;bioretention

;bioretention

:A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

:Any shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

;Bioswale

;Bioswale ;bioswale

;Bioswales

;Bioswales ;bioswales

;Dry swale ;dry swale

;bioswales

;Dry swales ;dry swales

;Dry swale

;Dry swales

;dry swales

:Linear bioretention cell designed to convey, treat and attenuate stormwater runoff. The engineered filter media soil mixture and vegetation slows the runoff water to allow sedimentation, filtration through the root zone, evapotranspiration, and infiltration into the underlying native soil.

:Linear bioretention cell designed to convey, treat and attenuate stormwater runoff. The engineered filter media soil mixture and vegetation slows the runoff water to allow sedimentation, filtration through the root zone, evapotranspiration, and infiltration into the underlying native soil.

;Catchment

;Catchment ;catchment

;catchment

;Source area ;source area

;Source area

;source area

:The land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale.   

:The land draining to a single reference point (usually a structural BMP); similar to a subwatershed, but on a smaller scale.   

;Check dam  

;Check dam ;check dam

;Check dams

;Check dams ;check dams

;check dams

:Structures constructed of a non-erosive material, such as suitably sized aggregate, wood, gabions, riprap, or concrete; used to slow runoff water. Can be employed in practices such as bioswales and enhanced grass swales.

:Structures constructed of a non-erosive material, such as suitably sized aggregate, wood, gabions, riprap, or concrete; used to slow runoff water. Can be employed in practices such as bioswales and enhanced grass swales.

;Cistern

;Cistern ;cistern

;Cisterns

;Cisterns ;cisterns

;cisterns

:Tank used to store rainwater (typically roof runoff) for later use.

:Tank used to store rainwater (typically roof runoff) for later use.

;Compost

;Compost ;compost

;compost

:Decayed organic material used as a plant fertilizer. Compost helps to support healthy plant growth through the slow release of nutrients and the retention of moisture in the soil.  

:Decayed organic material used as a plant fertilizer. Compost helps to support healthy plant growth through the slow release of nutrients and the retention of moisture in the soil.  

;Control structure

;Control structure ;control structure

;control structure

:Structure to control the volume or rate of flow of water through or over it.

:Structure to control the volume or rate of flow of water through or over it.

;Conveyance

;Conveyance ;conveyance

;conveyance

:Movement of water from one location to another.  

:Movement of water from one location to another.  

;Cultivar

;Cultivar ;cutivar

;cutivar

:A cultivated variety of a plant created by horticultural practice, often closed in large numbers from a similar individual. Cultivar names typically appear after the scientific name of a species, e.g. Prunus virginiana ‘Shubert’.

:A cultivated variety of a plant created by horticultural practice, often closed in large numbers from a similar individual. Cultivar names typically appear after the scientific name of a species, e.g. Prunus virginiana ‘Shubert’.

;Depression Storage

;Depression Storage ;depression storage

:A technique for incorporating shallow depressed areas into urban landscaped areas for storing and infiltrating runoff. Depression storage areas are small and have limited capacity and limited duration of retention in order to address property owner concerns relating to insects, damage to structures and inconvenience of ponded water on their property.

:A technique for incorporating shallow depressed areas into urban landscaped areas for storing and infiltrating runoff. Depression storage areas are small and have limited capacity and limited duration of retention in order to address property owner concerns relating to insects, damage to structures and inconvenience of ponded water on their property.

;Detention

;Detention ;detention

:The temporary storage of stormwater to control discharge rates, and allow for sedimentation.

:The temporary storage of stormwater to control discharge rates, and allow for sedimentation.

;Drawdown time

;Drainage time ;drainage time

:The period between the maximum water level and the minimum level (dry weather or antecedent level).

:The period between the maximum water level and the minimum level (dry weather or antecedent level).

;Dry pond

;Dry pond ; dry pond

;Infiltration basin

;Infiltration basin ;infiltration basin

:Depressed storage area, designed to capture flood events.  

:Depressed storage area, designed to capture flood events.  

;Evapotranspiration

 

;Evapotranspiration ; evapotranspiration

:The combined loss of water to the atmosphere from land and water surfaces by evaporation and from plants by transpiration.

:The combined loss of water to the atmosphere from land and water surfaces by evaporation and from plants by transpiration.

;Enhanced grass swale

;Enhanced grass swale ;enhanced grass swale

;Enhanced swale

;Enhanced swale ;enhanced swale

:Vegetated open channels, with check dams; designed to convey, treat and attenuate stormwater runoff, also referred to as enhanced vegetated swales.

:Vegetated open channels, with check dams; designed to convey, treat and attenuate stormwater runoff.  

;Environmental Impact Report (EIR)

;Environmental Impact Report (EIR)

:The evaluation of the possible effects that may arise from a proposed project on the environment, together consisting of the natural, social and economic aspects.

:The evaluation of the possible effects that may arise from a proposed project on the environment, together consisting of the natural, social and economic aspects.

;Exfiltration

;Exfiltration ;exfiltration

:Loss of water from a drainage system as a result of percolation or absorption into the surrounding medium (e.g., the infiltration of water into the native soil through a perforated pipe wall as it is conveyed).

:Loss of water from a drainage system as a result of percolation or absorption into the surrounding medium (e.g., the infiltration of water into the native soil through a perforated pipe wall as it is conveyed).

;Filter media

;Filter media ;filter media

:The engineered soil bed component of bioretention cell or dry swale designs, typically composed of a sandy soil mixture containing a limited proportion of fine textured material, which provides a growing medium for vegetation, maintains a high rate of infiltration over the lifespan of the practice, and retains contaminants through filtration and adsorption to soil particles.

:The engineered soil component of bioretention cell or dry swale designs, typically with a high rate of infiltration and designed to retain contaminants through filtration and adsorption to particles.

;Filtration

;Filtration ;filtration

:The technique of removing pollutants from runoff as it infiltrates through the soil.

:The technique of removing pollutants from runoff as it infiltrates through the soil.

;Fines

;Fines ;fines

:Soil particles with a diameter less than 0.050 mm.

:Soil particles with a diameter less than 0.050 mm.

;First flush: Initial pulse of stormwater runoff which picks up the pollutants that have settled on surfaces during the dry period. The first flush contains the highest pollutant concentrations.

;First flush ;first flush

:Initial pulse of stormwater runoff which picks up the pollutants that have settled on surfaces during the dry period. The first flush contains the highest pollutant concentrations.

;Forebay

;Forebay