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→Design Assumptions
* Native soil infiltration rate for Full Infiltration Design scenario was assumed to be 20 mm/h, and a safety factor of 2.5 was applied to calculate the design infiltration rate.
* Native soil infiltration rate for Full Infiltration Design scenario was assumed to be 20 mm/h, and a safety factor of 2.5 was applied to calculate the design infiltration rate.
* Operation and maintenance (O&M) cost estimates assume annual inspections, removal of trash and debris twice a year, removal of sediment from outlet catch basin annually, and removal of weeds twice a year. Verification inspections are included every 5 years to confirm adequate maintenance, and every 15 years to confirm adequate drainage performance through in-situ surface infiltration rate testing.
* Operation and maintenance (O&M) cost estimates assume annual inspections, removal of trash and debris twice a year, removal of sediment from outlet catch basin annually, and removal of weeds twice a year. Verification inspections are included every 5 years to confirm adequate maintenance, and every 15 years to confirm adequate drainage performance through in-situ surface infiltration rate testing.
* Impervious drainage area to pervious swale footprint area of 10:1 (tool default value).
* Designed with a trapezoidal cross section with a top width of 4.75 m, bottom width of 0.75 m, and 2.5:1 side slopes (tool default values).
* Designed with a trapezoidal cross section with a top width of 4.75 m, bottom width of 0.75 m, and 2.5:1 side slopes (tool default values).
*
* Swale depth of 0.5 m, bottom length of 42.11 m and surface area at top of 200 m2.
* Longitudinal slope of 3%.
* Longitudinal slope of 3%.
* Includes concrete curb check dams (0.3 m in height) for every 10 m of swale length (4 in total).
* Includes concrete curb check dams (0.3 m in height each) for every 10 m of swale length (4 in total).
* Includes a 8.4 m wide driveway and 300 mm diameter culvert.
* Includes a 8.4 m wide driveway and 300 mm diameter culvert crossing.
* Designed for a maximum velocity of 0.3 m/s.
* Designed for a maximum flow velocity of 0.3 m/s.
===Notes===
===Notes===