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Line 462: − Arterial Road + − A road primarily for through traffic. + − Base Flow + − The portion of stream flow that is not due to storm runoff and is supported by groundwater seepage into a channel. + − BMP or 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. + − Catchbasin + − Box like underground concrete structure with openings in curb and gutter designed to collect runoff from streets and pavement. + − City + − The City of Toronto + − Clay (SOILS) + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + + + + + + + + − Dry Weather flow + − Sewage flow resulting from both sanitary wastewater (combined input of industrial, domestic and commercial flows); and infiltration and inflows from foundation drains or other drains occurring during periods with an absence of rainfall or snowmelt. + − − − Ecosystem − A biological community, including humans and their natural environment. − End-of-pipe Control − A structural best management practice that is located at the end of a flow conveyance route. End-of-Pipe Controls on surface and below ground but are not limited to wet ponds, constructed wetlands and other similar systems. − Enhancement − Emphasis on improving the value of particular aspects of water and related land resources. − Environment − Refers to the conditions in which an organism lives and survives or the conditions in which an organism resides. These conditions can be described as aspects of a “physical”, “social” or an “economic” environment, depending on the perspective perceived by the observer. − 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). − Erosion Control − Includes the protection of soil from dislocation by water, wind or other agents. − Evapotranspiration (ET) − The quantity of water transpired (given off). Retained in plant tissues, and evaporated from plant tissues and surrounding soil surfaces. Quantitatively it is s − usually expressed in terms of depth of water per unit area during a specified period. − Exfiltration − The downward movement of water through the soil, the downward flow of runoff from the bottom of an infiltration BMP into the soil. − Extended Detention − A stormwater design features that provides for the gradual release of a volume of water in order to increase settling of pollutants and protect downstream channels from frequent storm events. − First Flush − The delivery of a disproportionately large load of pollutants during the early part of storms due to the rapid runoff of accumulated pollutants. The first flush of runoff has been defined several ways (e.g., one half inch per impervious City of Toronto Wet Weather Flow Management November 2006 46 − + − + − + − General Manager + − The person appointed by the City from time to time as the General Manager of Toronto Water and his or her successors or his or her duly authorized representative. + − Geomorphology + − + − + − + − + − + − + − + − + − + − Hierarchical Approach + − Implementation of Wet Weather Flow measures following hierarchical approach in the following order: + − + − + − + − + − + − + − + − + − + − + − + − + − + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − + − + − + − + − + − + − + − + − + − + − + − Official Plan + − The adopted Official Plan of the City of Toronto. + − + − Separator (OGS) + − + − + − + − + − + − + − + − + − Soil or other material that allows the infiltration or passage of water or other liquids. + − + − + − + − + − + + + + + + + + + + + + + + + + + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − That potion of the water precipitated onto a catchment area, which flows as + − + − + − Natural mineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm. + − + − + − + − Sewage + − + − + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − + − Substrate particles smaller than sand and larger than clay (3 to 60 m) + − + − A pit into which liquids may flow and then percolate slowly into the subsoil. + − + − + − + − + − + − + − + − + − + − + − + − + − + − + − + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − + − + + + + − ;UV Disinfection + + + + + + − + + + − + Line 612:
Line 786: − + − Wetland − A vegetated area such as a bog, fen, marsh, or swamp, where the soil or root zone is saturated for part of the year. − + + + + +
no edit summary
;aquifers
;aquifers
:Layer of rock or soil that holds or transmits water.
:Layer of rock or soil that holds or transmits water.
;Arterial road;
;arterial road
:A road primarily for through traffic.
;Asphalt
;Asphalt
;Base flow
;Base flow
;base flow
;base flow
:The sustained flow in a channel due to groundwater interaction.
:The sustained flow in a channel not from storm runoff, instead arising from groundwater interaction.
;Basin
;Basin
;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.
;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.
;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
: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
:Box like underground concrete structure with openings in curb and gutter designed to collect runoff from streets and pavement.
;Catchment
;Catchment
;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
;Drainage time
;Drainage time
;drainage time
;drainage time
;Drawdown time
;drawdown 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).
;green roof
;green roof
:A thin layer of vegetation and growing medium installed on top of a conventional flat or sloped roof, also referred to as living roofs or rooftop gardens.
:A thin layer of vegetation and growing medium installed on top of a conventional flat or sloped roof, also referred to as living roofs or rooftop gardens.
;GI
:Green infrastructure
;Green infrastructure
;Green infrastructure
;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
;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.
;RWH
:Rainwater harvesting.
;Recharge
;Recharge
;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).
;Collector road
;collector road
:A road on which traffic movement and access to property have similar importance.
;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.
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).
;CSO
Collector Road
;Combined sewer overflow
A road on which traffic movement and access to property have similar importance.
;combined sewer overflow
Combined Sewer
: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 wastewater collection system, which conveys sanitary wastewater (domestic, commercial and industrial wastewaters) and Stormwater runoff through a single-pipe system to a treatment works.
CSO or Combined Sewer Overflow
;Conveyance practice
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 practice
Conveyance Control
: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.
A structural best management practice thatis located within the drainage system where flows are concentrated and are being conveyed along corridor. Conveyance controls include but are not limited to pervious pipes, roadside ditches, and other similar systems.
Ditch
;Ditch
A long narrow trench or furrow dug in the ground, as for irrigation, drainage, or a boundary line.
;ditch
Drainage
:A long narrow trench or furrow dug in the ground, as for irrigation, drainage, or a boundary line.
Natural or artificial means of intercepting and removing surface or subsurface water (usually by gravity).
Drainage Area
;Drainage
The total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds.
;drainage
Drainage System
:Natural or artificial means of intercepting and removing surface or subsurface water (usually by gravity).
A system flow of gully inlets, pipes, overland flow paths, open channels, culverts and detention basins used to convey runoff to its receiving waters. City of Toronto 45 Wet Weather Flow Management November 2006
;Drainage area
;drainage area
:The total surface area upstream of a point on a stream that drains toward that point. Not to be confused with watershed. The drainage area may include one or more watersheds.
;Drainage system
;drainage system
:A system flow of gully inlets, pipes, overland flow paths, open channels, culverts and detention basins used to convey runoff to its receiving waters. City of Toronto 45 Wet Weather Flow Management November 2006
;E. Coli
:A strain of bacteria found in the gut and waste products of animals. Some strains of this bacterium can be harmful to humans or animals if consumed. Food or water can become contaminated with E.Coli where unsanitary conditions exist.
E. Coli Bacteria
A strain of bacteria found in the gut and waste products of animals. Some strains of this bacterium can be harmful to humans or animals if consumed. Food or water can become contaminated with E.Coli where unsanitary conditions exist.
area).
;Ecosystem
Floodplain (100-year)
;ecosystem
The area adjacent to a stream that is on average inundated once a century
:A biological community, including humans and their natural environment.
;End-of-pipe control
;end-of-pipe control
A branch of both physiography and geology that deals with the form of the earth, the general configuration of its surface, and the changes that take place due to erosion of the primary elements and the buildup of erosional debris.
:A structural best management practice that is located at the end of a flow conveyance route. End-of-Pipe Controls on surface and below ground but are not limited to wet ponds, constructed wetlands and other similar systems.
Groundwater
The water below the surface, and typically below the groundwater table.
;Enhancement
Groundwater Recharge
;enhancement
Increases in groundwater storage by natural conditions or by human activity. See also artificial recharge
:Emphasis on improving the value of particular aspects of water and related land resources.
Groundwater Table
The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.
;Environment
Headwater
;environment
Referring to the source of a stream or river.
:Refers to the conditions in which an organism lives and survives or the conditions in which an organism resides. These conditions can be described as aspects of a “physical”, “social” or an “economic” environment, depending on the perspective perceived by the observer.
;Erosion
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. In some guidance documents for Stormwater quality management, this is also known as the treatment train approach.
;erosion
Hydrologic Cycle
:(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).
Also called the water cycle, this is the process of water evaporating condensing, falling to the ground as precipitation and returning to the ocean as run-off.
Hydrological
;Erosion control
Relating to the properties, distribution and effects of water on and below the earth’s surface, and in the atmosphere.
;erosion control
Infiltration
:Includes the protection of soil from dislocation by water, wind or other agents.
The slow movement of water into or through a soil or drainage system.
Infiltration Rate
;ET
The rate at which stormwater percolates into the subsoil measured in inches per hour.
:Evapotranspiation
I/I (Infiltration/Inflow
Inflow and/or infiltration of water into a sewer.
;Evapotranspiration
Irrigation
;evapotranspiration
Human application of water to agricultural or recreational land for watering purposes. City of Toronto Wet Weather Flow Management November 2006 47
:The quantity of water transpired (given off). Retained in plant tissues, and evaporated from plant tissues and surrounding soil surfaces. Quantitatively it is usually expressed in terms of depth of water per unit area during a specified period. e.g. mm/day
;Exfiltration
;exfiltration
:The downward movement of water through the soil, the downward flow of runoff from the bottom of an infiltration BMP into the soil.
;Extended detention
;extended detention
:A stormwater design features that provides for the gradual release of a volume of water in order to increase settling of pollutants and protect downstream channels from frequent storm events.
;First flush
;first flush
:The delivery of a disproportionately large load of pollutants during the early part of storms due to the rapid runoff of accumulated pollutants. The first flush of runoff has been defined several ways (e.g., 10 mm per impervious area).
;Floodplain (100-year)
;floodplain
:The area adjacent to a stream that is, on average, inundated once a century
;Geomorphology
;geomorphology
:A branch of both physiography and geology that deals with the form of the earth, the general configuration of its surface, and the changes that take place due to erosion of the primary elements and the buildup of sediment.
;Groundwater
;groundwater
:The water below the surface, and typically below the groundwater table.
;Groundwater recharge
;groundwater recharge
:Increases in groundwater storage by natural conditions or by human activity. See also artificial recharge
;Groundwater table
;groundwater table
;water table
;Water table
:The upper surface of the zone of saturation, except where the surface is formed by an impermeable body.
;Headwater
;headwater
:Referring to the source of a stream or river.
;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.
;Hydrologic cycle
:Also called the water cycle, this is the process of water evaporating condensing, falling to the ground as precipitation and returning to the ocean as run-off.
;Hydrological
;hydrological
:Relating to the properties, distribution and effects of water on and below the earth’s surface, and in the atmosphere.
;Infiltration
;infiltration
:The slow movement of water into or through a soil or drainage system.
;Infiltration rate
;infiltration rate
:The rate at which stormwater percolates into the subsoil measured in inches per hour.
;I/I
;Infiltration/Inflow
:Inflow and/or infiltration of water into a sewer.
;Irrigation
;irrigation
:Human application of water to agricultural or recreational land for watering purposes. City of Toronto Wet Weather Flow Management November 2006 47
Local Road
;Local road
A road primarily for access to property.
;local road
Low
:A road primarily for access to property.
Impact Development
Low impact development is a stormwater management and land development strategy applied at the parcel and subdivision scale that emphasizes conservation and use of on-site natural features integrated with engineered, small scale hydrologic controls to more closely mimic pre-development hydrologic functions.
;Low Impact Development
Major Drainage System
:Low impact development is a stormwater management and land development strategy applied at the parcel and subdivision scale that emphasizes conservation and use of on-site natural features integrated with engineered, small scale hydrologic controls to more closely mimic pre-development hydrologic functions.
That storm drainage system which carries the total runoff of the drainage system less the runoff carried by the minor system (storm sewer). The major system will function whether or not it has been planned and designed, and whether or not developments are situated wisely with respect to it. The Major Drainage System usually includes many features such as streets, gullies, and major drainage channels.
Minor Drainage System
;Major drainage 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.
;major drainage system
Natural Systems Solutions
:That storm drainage system which carries the total runoff of the drainage system less the runoff carried by the minor system (storm sewer). The major system will function whether or not it has been planned and designed, and whether or not developments are situated wisely with respect to it. The Major Drainage System usually includes many features such as streets, gullies, and major drainage channels.
Projects following the philosophy in which terrestrial and aquatic vegetation provides the ability to cleanse water of its contaminants.
;Minor drainage system
;minor drainage system
Oil/Grit
;minor system
;Minor system
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.
: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.
Outfall
The point, location, or structure where wastewater or drainage discharges from a sewer pipe, ditch or other conveyance to a receiving body of water.
;Natural systems solutions
Overland Flow Path
;natural systems solutions
Open space floodway channels, road reserves, pavement expanses and other flow paths that convey flows typically in excess of the capacity of the Minor Drainage System.
:Projects following the philosophy in which terrestrial and aquatic vegetation provides the ability to cleanse water of its contaminants.
Peak Discharge
The greatest volume of stream flow occurring during a storm event.
;Oil/grit separator
Permeable
;oil and grit separator
;OGS
Pollutant
: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.
(1) Something that pollutes, especially a waste material that contaminate
air, soil, or water.
;Outfall
(2) Any solute or cause of change in physical, chemical or biological
;outfall
properties that render water unfit for a given use.City of Toronto Wet Weather Flow Management November 2006 48
:The point, location, or structure where wastewater or drainage discharges from a sewer pipe, ditch or other conveyance to a receiving body of water.
;Overland Flow
;overland flow
:Open space floodway channels, road reserves, pavement expanses and other flow paths that convey flows typically in excess of the capacity of the Minor Drainage System.
;Peak Discharge
;peak discharge
:The greatest volume of stream flow occurring during a storm event.
;Permeable
;permeable
:The property of a material that allows the infiltration or passage of water (or other liquids).
;Pollutant
;pollutant
:(1) Something that pollutes, especially a waste material that contaminate air, soil, or water. (2) Any solute or cause of change in physical, chemical or biological properties that render water unfit for a given use.
Pond
;Pond
A body of water smaller than a lake, often artificially formed.
;pond
Precipitation
:A body of water smaller than a lake, often artificially formed.
Any form of rain or snow.
Private Property
;Porosity
Land owned by private individuals or companies.
;porosity
Public Property
: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)
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).
Rainfall Intensity
;Precipitation
The rate of rainfall in millimeters per hour.
;precipitation
Recharge
:Any form of rain or snow.
The addition of water to ground water by natural or artificial processes.
Receiving Waters
;Private Property
Watercourses and Lake Ontario, to which Stormwater and Combined Sewer Overflows discharge.
;private property
Riparian Areas
:Land owned by private individuals or companies.
Areas adjacent to a watercourse that are saturated by groundwater or intermittently inundated by surface water at a frequency and duration sufficient to support the growth of vegetation typically adapted for life in saturated soil.
Runoff
;Public Property
;public property
surface discharge from the catchment area past a specified point.
: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).
Sand
;Rainfall Intensity
Sediments
;rainfall intensity
Soil, sand and minerals washed from land into water, usually after rain. They pile up in reservoirs, rivers and harbors, destroying fish-nesting areas and holes of water animals and cloud the water so that needed sunlight might not reach aquatic plans. Careless farming, mining and building activities will expose sediment materials, allowing them to be washed off the land after rainfalls.
:The rate of rainfall in millimeters per hour.
Sedimentation
;Recharge
Deposition of material of varying size, both mineral and organic away from its site of origin by the action of water, wind, gravity or ice.
;recharge
The liquid waste from domestic, commercial and industrial establishments. City of Toronto Wet Weather Flow Management Guidelines November 2006 49
:The addition of water to ground water by natural or artificial processes.
;Receiving waters
;receiving waters
:Watercourses and Lake Ontario, to which Stormwater and Combined Sewer Overflows discharge.
;Riparian areas
;riparian areas
:Areas adjacent to a watercourse that are saturated by groundwater or intermittently inundated by surface water at a frequency and duration sufficient to support the growth of vegetation typically adapted for life in saturated soil.
;Runoff
;runoff
: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
:Mineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm.
;Sediments
;sediments
;sediment
;Sediment
:Soil, sand and minerals washed from land into water, usually after rain. They pile up in reservoirs, rivers and harbors, destroying fish-nesting areas and holes of water animals and cloud the water so that needed sunlight might not reach aquatic plans. Careless farming, mining and building activities will expose sediment materials, allowing them to be washed off the land after rainfalls.
;Sedimentation
;sedimentation
:Deposition of material of varying size, both mineral and organic away from its site of origin by the action of water, wind, gravity or ice.
;Sewage
;sewage
:The liquid waste from domestic, commercial and industrial establishments. City of Toronto Wet Weather Flow Management Guidelines November 2006 49
Silt
;Silt
;silt
Soakaway Pit
:Soil or media particles smaller than sand and larger than clay (3 to 60 m)
Source Control
;Soakaway
A practice or structural measure that is usually implemented at the beginning of a drainage system or at the lot level, to reduce the volume of runoff and minimize the concentration of pollution in overland flow from private property and prevent pollutants from entering Stormwater runoff or other environmental media, as described by the Ministry of Environment.
;soakaway
Stakeholder
:An underground water storage reservoir into which stormwater is directed and allowed to percolate into the underlying native subsoil.
Any person, agency or group who has a direct interest in the purpose of a proposed undertaking.
Stormwater
;Source control
Surface runoff resulting from rain or snowmelt events.
;source control
Stormwater Wetlands
:A practice or structural measure that is usually implemented at the beginning of a drainage system or at the lot level, to reduce the volume of runoff and minimize the concentration of pollution in overland flow from private property and prevent pollutants from entering Stormwater runoff or other environmental media, as described by the Ministry of Environment.
Shallow, constructed pools that capture stormwater and allow for the growth of
characteristic wetland vegetation.
;Stakeholder
Subwatershed
;stakeholder
The drainage area of one or more contributing watercourses to a river.
:Any person, agency or group who has a direct interest in the purpose of a proposed undertaking.
Subwatershed Plan
The result of a study undertaken within the drainage area of one or more watercourses of a specific river following the guidance presented in the MOE Stormwater Management Planning and Design Manual (i.e. Humber Creek subwatershed within the Humber River Watershed).
;Stormwater
Swale
;stormwater
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.
:Surface runoff from at-grade surfaces, resulting from rain or snowmelt events.
;STEP
:Sustainable Technologies Evaluation Program
;SWM
:Stormwater Management
;Stormwater wetlands
;stormwater wetlands
:Shallow, constructed pools that capture stormwater and allow for the growth of characteristic wetland vegetation.
;Subwatershed
;subwatershed
:The drainage area of one or more contributing watercourses to a river.
;Subwatershed plan
;subwatershed plan
:The result of a study undertaken within the drainage area of one or more watercourses of a specific river following the guidance presented in the MOE Stormwater Management Planning and Design Manual (i.e. Humber Creek subwatershed within the Humber River Watershed).
;Swale
;swale
;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.
;Total Suspended Solids (TSS)
;Total Suspended Solids
:The total amount of particulate matter that is suspended in the water column.
:The total amount of particulate matter that is suspended in the water column.
;Unit Response Function (URF)
;URF
: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
;watercourse
;watercourse
:(a) A natural well-defined channel produced wholly or in part by a definite flow of water and through which water flows continuously or intermittently. Also, a ditch, canal, aqueduct, or other artificial channel for the conveyance of water to or away from a given place, as for the draining of a swamp. (b) A stream or current of water. Legally, a natural stream arising in a given drainage basin but not wholly dependent for its flow on surface drainage in its immediate area, flowing in a channel with a well-defined bed between visible banks or through a definite depression (as a ravine or swamp) in the surrounding land, having a definite and permanent periodic supply of water (the stream may be intermittent), and usually, but not necessarily having a perceptible current in a particular direction and discharging at affixed point into another body of water. (c) A legal right permitting the use of a flow of a stream (especially of one flowing through one’s land) or the receipt of water discharged upon land belonging to another.
:(a) A natural well-defined channel produced wholly or in part by a definite flow of water and through which water flows continuously or intermittently. Also, a ditch, canal, aqueduct, or other artificial channel for the conveyance of water to or away from a given place, as for the draining of a swamp.
:(b) A stream or current of water. Legally, a natural stream arising in a given drainage basin but not wholly dependent for its flow on surface drainage in its immediate area, flowing in a channel with a well-defined bed between visible banks or through a definite depression (as a ravine or swamp) in the surrounding land, having a definite and permanent periodic supply of water (the stream may be intermittent), and usually, but not necessarily having a perceptible current in a particular direction and discharging at affixed point into another body of water.
:(c) A legal right permitting the use of a flow of a stream (especially of one flowing through one’s land) or the receipt of water discharged upon land belonging to another.
;Water Conservation
;Water conservation
;water conservation
;water conservation
:Reduction in applied water due to more efficient water use such as implementation of Urban Best Management Practices or Agricultural Efficient Water Management Practices. The extent to which these actions actually create a savings in water supply depends on how they affect net water use and depletion.
:Reduction in applied water due to more efficient water use such as implementation of Urban Best Management Practices or Agricultural Efficient Water Management Practices. The extent to which these actions actually create a savings in water supply depends on how they affect net water use and depletion.
:The drainage area of a river.
:The drainage area of a river.
;Watershed Plan
;Watershed plan
;watershed plan
;watershed plan
:The result of a study undertaken within the drainage area of a specific river following the guidance presented in the MOE Stormwater Management Planning and Design Manual (i.e. Humber River Watershed).
:The result of a study undertaken within the drainage area of a specific river following the guidance presented in the MOE Stormwater Management Planning and Design Manual (i.e. Humber River Watershed).
;Wet Weather Flow
;Wetland
;wetland
:A vegetated area such as a bog, fen, marsh, or swamp, where the soil or root zone is saturated for part of the year.
;Wet weather flow
;wet weather flow
;wet weather flow
:Stormwater runoff generated by either rainfall or snowmelt or flow resulting from sanitary wastewater that enters the combined sewer system; infiltration and inflows from foundation drains or other drains are resulting from rainfall or snowmelt.
:Stormwater runoff generated by either rainfall or snowmelt or flow resulting from sanitary wastewater that enters the combined sewer system; infiltration and inflows from foundation drains or other drains are resulting from rainfall or snowmelt.