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;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).
;Compost
;Compost
;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
;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
;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
;RWH
;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