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→Overview
==Overview==
==Overview==
[[Enhanced swales]] (also referred to as Enhanced Grass Swales - EGS) are vegetated open channels designed to convey, treat and attenuate stormwater runoff. Simple grass channels or ditches have long been used for stormwater conveyance, particularly for road drainage. Enhanced swales incorporate design features such as modified geometry and [[check dams]] that improve the contaminant removal and runoff reduction functions of simple grass channel and
[[Enhanced swales]] (also referred to as Enhanced Grass Swales - EGS) are vegetated open channels designed to convey, treat and attenuate stormwater runoff. Simple grass channels or ditches have long been used for stormwater conveyance, particularly for road drainage. Enhanced swales incorporate design features such as modified geometry and [[check dams]] that improve the contaminant removal and runoff reduction functions of simple grass channel and
roadside ditch designs. Where development density, topography and depth to water table permit, swales are a preferable alternative to curb and gutter and storm drains as a stormwater conveyance system. STEP has prepared life cycle costs estimates for each design configuration, based on a 2,000 m<sup>2</sup> road drainage area, runoff control target of 25 mm depth and 72 hour drainage period, for comparison which can be viewed below. To generate your own life cycle cost estimates customized to the development context, design criteria, and constraints applicable to your site, access the updated [https://sustainabletechnologies.ca/lid-lcct/ LID Life Cycle Costing Tool (LCCT) here].
roadside ditch designs. Where development density, topography and depth to water table permit, swales are a preferable alternative to curb and gutter and storm drains as a stormwater conveyance system. STEP has prepared life cycle costs estimates for an enhanced swale located on highly permeable native soil (Full Infiltration design), based on a 2,000 m<sup>2</sup> road drainage area, runoff control target of 25 mm depth and 72 hour drainage period, which can be viewed below. To generate your own life cycle cost estimates customized to the development context, design criteria, and constraints applicable to your site, access the updated [https://sustainabletechnologies.ca/lid-lcct/ LID Life Cycle Costing Tool (LCCT) here].
==Design Assumptions==
==Design Assumptions==