Changes

;Impervious

;Impervious

:A hard surface area (e.g., road, parking area or rooftop) that prevents or retards the infiltration of water into the soil.

:A hard surface area (e.g., road, parking area or rooftop) that prevents or retards the infiltration of water into the soil.

;infiltration

;infiltration

:Penetration of water through the ground surface.

:Penetration of water through the ground surface.

;Inline

;Inline

:Refers to a system that accepts all of the flow from a drainage area and conveys larger event flows through an overflow outlet.

:Refers to a system that accepts all of the flow from a drainage area and conveys larger event flows through an overflow outlet.

;Introduced species

;Introduced species

:Plant species (or non-native species) are those that do not naturally or historically occur in a particular area.

:Plant species (or non-native species) are those that do not naturally or historically occur in a particular area.

;Interception

;Interception

:The interception, storage and eventual evaporation of rainfall from vegetation canopies.

:The interception, storage and eventual evaporation of rainfall from vegetation canopies.

;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.  

;Landform

;Landform

:The natural features of the landscape, dictates flow patterns, runoff velocities and discharge rates.

:The natural features of the landscape, dictates flow patterns, runoff velocities and discharge rates.

;Landscape-based approach:

;Landscape-based approach

:The principle that development form, servicing and stormwater management strategies should be defined by the biophysical, hydrological and ecological attributes of the landscape.

:The principle that development form, servicing and stormwater management strategies should be defined by the biophysical, hydrological and ecological attributes of the landscape.

;Loading

;Loading

:The net amount of something (e.g. chemical, such as phosphorus), calculated as the product of concentration and volume in a given time. Some BMPs significantly reduce loading of pollutants to the environment by reducing volume more so than concentration.   

:The net amount of something (e.g. chemical, such as phosphorus), calculated as the product of concentration and volume in a given time. Some BMPs significantly reduce loading of pollutants to the environment by reducing volume more so than concentration.   

;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.

;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.

;Mulch

;Mulch

;mulch

;mulch

:Shredded woody material or leaf compost used as a top dressing over vegetation beds that provides a source of soil nutrients and helps retain soil moisture; in bioretention cells and dry swales the surface mulch layer provides pollutant removal and improves growing conditions for the selected plants; shredded hardwood bark has been found to work best as it is less likely to float.

:a top dressing over vegetation beds that provides suppresses weeds and helps retain soil moisture in bioretention cells, stormwater planters and dry swales.  

;Native plants

;Native plants

;Permeable pavement

;Permeable pavement

;Permeable paving

;Permeable paving

:An alternative practice to traditional impervious pavement, prevents the generation of runoff by allowing precipitation falling on the surface to infiltrate through the surface course into an underlying stone reservoir and, where suitable conditions exist, into the native soil.

:An alternative practice to traditional impervious pavement, prevents the generation of runoff by allowing precipitation falling on the surface to infiltrate through the surface course into an underlying stone reservoir and, where suitable conditions exist, into the native soil.

:The total mass of a pollutant entering a waterbody over a defined time period.

:The total mass of a pollutant entering a waterbody over a defined time period.

;Predevelopment

;Pre-development

;predevelopment

;pre-development

:refers to the characteristics and functions of a system prior to urban development.

:refers to the characteristics and functions of a system prior to urban development.

;Rainwater harvesting

;Rainwater harvesting

;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.

;Recharge

;Recharge

;Riparian

;Riparian

:A vegetated ecosystem alongside a waterbody, characteristically have a high water table and are subject to periodic flooding.

:A vegetated ecosystem alongside a waterbody, characteristically have a high water table and are subject to periodic flooding.

;Stormwater planter

;Stormwater planter

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

:A vegetated practice that collects and treats stormwater through sedimentation and filtration. Contributions to water cycle/water balance are through evapotranspiration only; no infiltration.  

;Stream channel

;Stream channel

:A natural waterway, formed by fluvial processes, that conveys running water.

:A natural waterway, formed by fluvial processes, that conveys running water.

;Time of concentration

;Time of concentration

:The time needed for a drop of water to reach the outlet of a catchment from the most remote location within the catchment.

:The time needed for a drop of water to reach the outlet of a catchment from the most remote location within the catchment.

;Treatment train

;Treatment train

:A combination of lot level, conveyance, and end-of-pipe stormwater management practices.

:A combination of lot level, conveyance, and end-of-pipe stormwater management practices.

;Underdrain

;Underdrain

:A perforated pipe used to assist the draining of soils.

:A perforated pipe used to assist the draining of soils.

;Urbanization  

;Urbanization

:The changing of land cover and land uses from rural to urban; the growth of urban settlements.

:The changing of land cover and land uses from rural to urban; the growth of urban settlements.

;Vegetated filter strip

;Vegetated filter strip

:Are gently sloping, densely vegetated areas that treat runoff as sheet flow from adjacent impervious areas. They function by slowing runoff velocity and filtering out suspended sediment and associated pollutants, and by providing some infiltration into underlying soils. Also known as buffer strips and grassed filter strips.

:a gently sloping, densely vegetated areas that treat runoff as sheet flow from adjacent impervious areas. They function by slowing runoff velocity and filtering out suspended sediment and associated pollutants, and by providing some infiltration into underlying soils.

;Water balance:

;Water balance

:The accounting of inflow and outflow of water in a system according to the components of the hydrologic cycle.

:The accounting of inflow and outflow of water in a system according to the components of the hydrologic cycle.

;Water cycle

;Water cycle

:The continuous movement of water from the oceans to the atmosphere (by evaporation), from the atmosphere to the land by condensation and precipitation, and from the land back to the sea (via groundwater and stream flow); also referred to as hydrologic cycle.

:The continuous movement of water from the oceans to the atmosphere (by evaporation), from the atmosphere to the land by condensation and precipitation, and from the land back to the sea (via groundwater and stream flow); also referred to as hydrologic cycle.

;Water budget

;Water budget

:The mathematical expression of the water balance.

:The mathematical expression of the water balance.

;Water quality volume

;Water quality volume

:The amount of stormwater runoff from a given area required to be retained by stormwater management practices to reduce pollutant load to an acceptable level.

:The amount of stormwater runoff from a given area required to be retained by stormwater management practices to reduce pollutant load to an acceptable level.

;Water table

;Water table

:Subsurface water level which is defined by the level below which all the spaces in the soil are filled with water; The entire region below the water table is called the saturated zone.

:Subsurface water level which is defined by the level below which all the spaces in the soil are filled with water; The entire region below the water table is called the saturated zone.

;Watershed

;Watershed

: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.

   

   

Arterial Road  

Arterial Road  

: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.  

;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

: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.  

;Watershed  

;Watershed  

:The drainage area of a river.  

:The drainage area of a river.  

;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).  

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.  

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

: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.