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no edit summary
;Biofilter
;Biofilter
;biofilter
;biofilter
;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.
;BMP
;BMP
:Best management practice. State of the art methods or techniques used to manage the quantity and improve the quality of wet weather flow. BMPs include: source, conveyance and end-of-pipe controls.
;Best Management Practices
;Best Management Practices
;best management practices
;best management practices
State of the art methods or techniques used to manage the quantity and improve the quality of wet weather flow. BMPs include Source, Conveyance and End-Of-Pipe Controls.
:State of the art methods or techniques used to manage the quantity and improve the quality of wet weather flow. BMPs include Source, Conveyance and End-Of-Pipe Controls.
;Catchbasin
;Catchbasin
;catchbasin
;catchbasin
Box like underground concrete structure with openings in curb and gutter designed to collect runoff from streets and pavement.
:Box like underground concrete structure with openings in curb and gutter designed to collect runoff from streets and pavement.
;Catchment
;Catchment
;cisterns
;cisterns
:Tank used to store rainwater (typically roof runoff) for later use.
:Tank used to store rainwater (typically roof runoff) for later use.
;Cleanout
;cleanout
;Cleanouts
;cleanouts
;Clean out
;clean out
;Clean-out
;clean-out
;Clean-Out
;Clean Out
:Cleanouts are "a fitting access in a drainage system or venting system that is installed to provide access for cleaning and inspection and that is provided with a readily replaceable air tight cover" (O.Reg 332/12: Building Code, 2022).
;Climate change scenario
;climate change scenario
:a plausible description of the future climate based on a model simulation using an assumed emissions scenario.
;Compost
;Compost
;cultivar
;cultivar
: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’.
;CVC
:Credit Valley Conservation
;Depression Storage
;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.
;Design storm
;design storm
:A rainfall pattern for use for the design of a hydraulic structure or system. A design storm is a specified amount of rainfall from a storm1 with its spatial and temporal distribution used to estimate a design discharge.
;Detention
;Detention
:Depressed storage area, designed to capture flood events.
:Depressed storage area, designed to capture flood events.
;Evaporation
;Emissions scenario
;evaporation
;emissions scenario
:Abiotic transfer of water vapour to the atmosphere.
:A description of how emissions of greenhouse gases and aerosols, or their precursors, and other external influences on the climate might evolve in the future. The Government of Canada usually presents three emissions scenarios (RCP8.5 = high global emission scenario, RCP4.5 = medium, RCP2.6 = low).
;Enhanced grass swale
;Enhanced grass swale
;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.
;Evaporation
;evaporation
:Abiotic transfer of water vapour to the atmosphere.
;Evapotranspiration
;evapotranspiration
:The combined loss of water to the atmosphere from land and water surfaces by evaporation and from plants by transpiration.
;Exfiltration
;Exfiltration
;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.
: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.
;FIT
;FIT work
;FIT Work
;FIT (Forensic Inspection and testing)
:FIT work involves the application of a similar set of inspection and testing indicators as those used in Performance Verification inspections, but focuses on diagnosing suspected problems with the following objectives in mind: (1) Confirm whether or not problems with BMP function exist; (2) Identify the causes of confirmed problems; (3) Determine corrective actions needed.
;Forebay
;Forebay
;fluvial geomorphology
;fluvial geomorphology
:The study of the processes responsible for the shape and form, or morphology, of watercourses; describes the processes whereby sediment (e.g., silt, sand, gravel) and water are transported from the headwaters of a watershed to its mouth.
:The study of the processes responsible for the shape and form, or morphology, of watercourses; describes the processes whereby sediment (e.g., silt, sand, gravel) and water are transported from the headwaters of a watershed to its mouth.
;Freshet
;freshet
:Annual spring increase in water levels caused by melting snow, ice, and increased rainfall.
;Fused grid
;Fused grid
;fused grid
;fused grid
:A hybrid neighbourhood and district layout model that combines the geometries of inner city grid road patterns with the loop and cul-de-sac road patterns of conventional suburbs.
:A hybrid neighbourhood and district layout model that combines the geometries of inner city grid road patterns with the loop and cul-de-sac road patterns of conventional suburbs.
;General Use Designation
;General Use Level Designation
;GULD
:The General Use Level Designation (GULD) is provided by the Washington Department of Technology to all technologies that meet the performance goals set out in the TAPE protocol. Performance requirements include 80% TSS removal for influent concentrations from 100-200 mg/L and effluent concentrations <20 mg/L for influent concentrations from 20 to 100 mg/L. See Table 2 in the TAPE protocol for more information.
;Geotextile
;Geotextile
;GI
;GI
:Green infrastructure
;Green infrastructure
;Green infrastructure
;green infrastructure
;green infrastructure
;invasive plants
;invasive plants
:Typically non-native plants that out-compete native species. These species lack natural predators, grow aggressively and reproduce rapidly and can be problematic in the natural environment.
:Typically non-native plants that out-compete native species. These species lack natural predators, grow aggressively and reproduce rapidly and can be problematic in the natural environment.
;Irreducible concentration
;irreducible concentration
;Irreducible level
;irreducible level
:The pollutant concentration below which further reduction can not be reliably achieved by the treatment technology in question (Schueler, 2000)<ref>Schueler, T. 2000. Irreducible Pollutant Concentration Discharged from Stormwater Practices. Technical Note #75, In Watershed Protection Techniques. 2(2), 369-372, Centre for Watershed Protection.</ref>
;I/P ratio
;I/P ratio
:The ratio of the catchment (impervious area) to the footprint area of the receiving BMP (pervious area).
:The ratio of the impervious catchment (drainage) area to the pervious (footprint) area of the receiving BMP.
;LSRCA
:Lake Simcoe Region Conservation Authority
;Landform
;Landform
;lot level
;lot level
:The treatment of urban runoff as close to the source area as possible through application of small scale stormwater management practices on individual properties that are linked to downstream conveyance and end-of-pipe practices.
:The treatment of urban runoff as close to the source area as possible through application of small scale stormwater management practices on individual properties that are linked to downstream conveyance and end-of-pipe practices.
;LID
:Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.
;Low impact development
;Low impact development
;low impact development
;low impact development
;Low Impact Development
;Low Impact Development
:A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.
:A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.
;offline
;offline
:Refers to a system that when full, stormwater will bypass the practice. Offline systems use flow splitters or bypass channels that only allow the water quality volume to enter the facility. This may be achieved with a pipe, weir, or curb opening sized for the target flow, but in conjunction, create a bypass channel so that higher flows do not pass over the surface of the filter bed.
:Refers to a system that when full, stormwater will bypass the practice. Offline systems use flow splitters or bypass channels that only allow the water quality volume to enter the facility. This may be achieved with a pipe, weir, or curb opening sized for the target flow, but in conjunction, create a bypass channel so that higher flows do not pass over the surface of the filter bed.
;Peak flow
;peak flow
:the maximum flow rate occurring during a flood event measured at a given point in a river, street, or pipe system.
;Permeable pavement
;Permeable pavement
;rainwater harvesting
;rainwater harvesting
:The practice of intercepting, conveying and storing rainwater for future use. Captured rainwater is typically used for outdoor non-potable water uses such as irrigation, or in the building to flush toilets.
:The practice of intercepting, conveying and storing rainwater for future use. Captured rainwater is typically used for outdoor non-potable water uses such as irrigation, or in the building to flush toilets.
;Rational Method
;Rational method
;rational method
:This formula is used to calculate peak rates of runoff when designing drainage LID BMPs in urban area. It is useful in estimating runoff on relatively small areas (roofs, parking lots, medians, road right-of-ways, etc.)
;RWH
:Rainwater harvesting.
;Recharge
;Recharge
;recharge
;recharge
:The infiltration and movement of surface water into the soil, past the vegetation root zone, to the zone of saturation or water table.
:The infiltration and movement of surface water into the soil, past the vegetation root zone, to the zone of saturation or water table.
;Return period
;return period
:The average time between years when an precipitation event of specified magnitude is met or exceeded.
;Riparian
;Riparian
;soil amendment
;soil amendment
:The practice of adding organic material, such as mulch or compost to topsoil to improve fertility, and tilling of the native soils to reverse compaction and restore its water retaining capacity.
:The practice of adding organic material, such as mulch or compost to topsoil to improve fertility, and tilling of the native soils to reverse compaction and restore its water retaining capacity.
;Sorption
;sorption
:The process where one substance adheres to or is taken up by another.
;Standing water
;Standing water
;standing water
;standing water
:Water ponded on the ground surface.
:Water ponded on the ground surface.
;Stoichiometry
;stoichiometry
:Stoichiometry in the terms of stormwater nutrient ratios is the consequences of mass balance of chemical elements constrained by either biological or ecological factors (i.e. media, sand, vegetation, soils, etc.).
;Stone reservoir
;Stone reservoir
;stone reservoir
;stone reservoir
:An underlying aggregate material bed that temporarily stores stormwater before infiltrating into the native soil or being conveyed by an underdrain pipe.
;Storage reservoir
;storage reservoir
:An underlying bed filled with aggregate or other void-forming fill material that temporarily stores stormwater before infiltrating into the native soil or being conveyed by an underdrain pipe.
;Stormwater planter
;Stormwater planter
;TP
;TP
:Total phosphorus
:Total phosphorus
;TRCA
:Toronto and Region Conservation Authority
;TSS
;TSS
:An area of land that drains into a river or a lake. The boundary of a watershed is based on the elevation (natural contours) of a landscape.
:An area of land that drains into a river or a lake. The boundary of a watershed is based on the elevation (natural contours) of a landscape.
;Clay
;clay
1. A mineral soil separate consisting of particles less than 0.002 millimeter in equivalent diameter. 2. A soil texture class. 3. (Engineering) A fine-grained soil (more than 50 percent passing the No. 200 Sieve) that has a high plasticity index in relation to the liquid limit. (Unified Soil Classification System).
:1. A mineral soil separate consisting of particles less than 0.002 millimeter in equivalent diameter. 2. A soil texture class. 3. (Engineering) A fine-grained soil (more than 50 percent passing the No. 200 Sieve) that has a high plasticity index in relation to the liquid limit. (Unified Soil Classification System).
;Collector road
;Collector road
;Combined Sewer
;Combined Sewer
;combined sewer
:A wastewater collection system, which conveys sanitary wastewater (domestic, commercial and industrial wastewaters) and Stormwater runoff through a single-pipe system to a treatment works.
:A wastewater collection system, which conveys sanitary wastewater (domestic, commercial and industrial wastewaters) and Stormwater runoff through a single-pipe system to a treatment works.
;Combined sewer overflow
;Combined sewer overflow
;combined sewer overflow
;combined sewer overflow
:A discharge to the environment from a Combined Sewer system that occurs because of a precipitation event when the capacity of the interceptor sewer or treatment plant is exceeded. It consists of a mixture of sanitary wastewater and Stormwater runoff.
:A discharge to the environment from a combined Sewer system that occurs because of a precipitation event when the capacity of the interceptor sewer or treatment plant is exceeded. It consists of a mixture of sanitary wastewater and Stormwater runoff.
;Conveyance
;Conveyance practice
;conveyance
;conveyance practice
A structural BMP that is located within the drainage system where flows are concentrated and are being conveyed along corridor. Include but are not limited to pervious pipes, swales, and other similar systems.
:A structural practice that is located within the drainage system where flows are concentrated and are being conveyed along corridor. Include but are not limited to pervious pipes, swales, and other similar systems.
;Ditch
;Ditch
;Erosion
;Erosion
;erosion
;erosion
(1) The wearing away of the land surface by moving water, wind, ice or other geological agents, including such processes as gravitation creep; (2) Detachment and movement of soil or rock fragments by water, wind, ice or gravity (i.e. Accelerated, geological, gully, natural, rill, sheet, splash, or impact, etc).
:(1) The wearing away of the land surface by moving water, wind, ice or other geological agents, including such processes as gravitation creep; (2) Detachment and movement of soil or rock fragments by water, wind, ice or gravity (i.e. Accelerated, geological, gully, natural, rill, sheet, splash, or impact, etc).
;Erosion control
;Erosion control
;ET
;ET
:Evapotranspiation
;Evapotranspiration
;Evapotranspiration
;evapotranspiration
;evapotranspiration
;Groundwater
;Groundwater
;groudnwater
;groundwater
:The water below the surface, and typically below the groundwater table.
:The water below the surface, and typically below the groundwater table.
;water table
;water table
;Water table
;Water table
The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.
:The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.
;Headwater
;Headwater
;headwater
;headwater
Referring to the source of a stream or river.
:Referring to the source of a stream or river.
;Treatment train
;Treatment train
;treatment train
;treatment train
Stormwater management following the hierarchical approach: Source Control measures, Conveyance Control measure and End of Pipe treatment to achieve the water quality and water balance target for lot level development of the preferred strategy.
:Stormwater management following the hierarchical approach: Source Control measures, Conveyance Control measure and End of Pipe treatment to achieve the water quality and water balance target for lot level development of the preferred strategy.
;Hydrologic cycle
;Hydrologic cycle
;minor drainage system
;minor drainage system
;minor system
;minor system
;Minsor system
;Minor system
:That storm drainage system which is frequently used for collecting, transporting, and disposing of snowmelt, miscellaneous minor flows, and storm runoff up to the capacity of the system. The capacity should be equal to the maximum rate of runoff to be expected from the minor design storm which may have a frequency of occurrence of one in 2, or 5 years. The minor system may include many features ranging from curbs and gutters to storm sewer pipes and open drainage ways.
:That storm drainage system which is frequently used for collecting, transporting, and disposing of snowmelt, miscellaneous minor flows, and storm runoff up to the capacity of the system. The capacity should be equal to the maximum rate of runoff to be expected from the minor design storm which may have a frequency of occurrence of one in 2, or 5 years. The minor system may include many features ranging from curbs and gutters to storm sewer pipes and open drainage ways.
;Oil/grit separator
;Oil/grit separator
;oil and grit seperator
;oil and grit separator
;OGS
;OGS
:Systems designed to remove trash, debris and some amount of sediment, oil and grease from stormwater runoff based on the principles of sedimentation for the grit and phase separation for the oil.
:Systems designed to remove trash, debris and some amount of sediment, oil and grease from stormwater runoff based on the principles of sedimentation for the grit and phase separation for the oil.
;Pond
;Pond
;pond
;pond
:A body of water smaller than a lake, often artificially formed.
:A body of water smaller than a lake, often artificially formed.
;Porosity
;porosity
:The porosity (n) of a mixture is the ratio of the volume of void-space to the total or bulk volume of the mixture. It is closely related to the concept of void ratio (e) where void ratio is the ratio of the volume of void-space to the volume of solids. n = Volume of voids/Total volume of mixture = e/(1+e)
;Precipitation
;Precipitation
;public property
;public property
:Land owned by the City Toronto or any other level of government or public agency (such as Toronto and Region Conservation Authority, Toronto Transit Commission, school boards).
:Land owned by the City Toronto or any other level of government or public agency (such as Toronto and Region Conservation Authority, Toronto Transit Commission, school boards).
;Pyrolysis
;pyrolysis
:The heating of an organic material in the absence of oxygen.
;Rainfall Intensity
;Rainfall Intensity
;Runoff
;Runoff
;runoff
;runoff
:That potion of the water precipitated onto a catchment area, which flows as surface discharge from the catchment area past a specified point.
:The portion of water precipitated onto a catchment area, which then flows as surface discharge from the catchment area past a specified point.
;Sand
;Sand
;Soakaway
;Soakaway
;soakaway
;soakaway
:A pit into which liquids may flow and then percolate slowly into the subsoil.
:An underground water storage reservoir into which stormwater is directed and allowed to percolate into the underlying native subsoil.
;Source control
;Source control
;stormwater
;stormwater
:Surface runoff from at-grade surfaces, resulting from rain or snowmelt events.
:Surface runoff from at-grade surfaces, resulting from rain or snowmelt events.
;STEP
:Sustainable Technologies Evaluation Program
;SWM
;SWM
;Stormwater wetlands
;Stormwater wetlands
;stormwater wetlands
;stormwater wetlands
Shallow, constructed pools that capture stormwater and allow for the growth of characteristic wetland vegetation.
:Shallow, constructed pools that capture stormwater and allow for the growth of characteristic wetland vegetation.
;Subwatershed
;Subwatershed
;Swales
;Swales
;swales
;swales
;Grass swale
;grass swale
;Grass swales
;grass swales
;Vegetated swale
;vegetated swale
;Vegetated swales
;vegetated swales
:A shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades.
:A shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades.
;URF
;URF
:unit response function
;Unit Response Function
;Unit Response Function
:Represents the hydrologic response and water quality response of the area to a pre-determined series of meteorological inputs.
:Represents the hydrologic response and water quality response of the area to a pre-determined series of meteorological inputs.
;UV disinfection
;UV disinfection
:A process of disinfecting that involves subjecting the item, object, or instrument to ultraviolet radiation.
:A process of disinfecting that involves subjecting the item, object, or instrument to ultraviolet radiation.
;Void ratio
;void ratio
;Void space ratio
;void space ratio
:The void ratio (e) of a mixture is the ratio of the volume of void-space to the volume of solids. It is closely related to the concept of porosity (n) where porosity is the ratio of the volume of void-space to the total or bulk volume of the mixture. e = Volume of voids/Volume of solids = n/(1-n)
;Watercourse
;Watercourse