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* The Tool assumes an in-line system.
−* The Tool assumed curb-and-gutter around the circumference of the facility with curb-cut inlets every 6 to 0.5 meter squared and stone splash pads.
−* The greater the slope, the more check dams placed by the Tool. The unit cost for check dams is for the amount of material required, not number of dams.
−* If configuration include driveway (2 laned), a culvert pipe connects the enhanced grass swale (EGS) and an extra 0.1m of gravel is added beneath culvert.
−* Swales which cross multiple driveways or smaller driveways can be accounted for by multiplying or dividing these costs in the "Additional Costs" cells.
===Notes===
===Notes===
−* Design includes [[pretreatment]] through stone diaphragms at [[Curb cuts|curb inlets]], and ditch inlet catch basin structure located at furthest downgradient end, with connection to storm sewer pipe, as outlet.
+* Design includes [[pretreatment]] through stone diaphragms at [[Curb cuts|curb inlets]], and ditch inlet catch basin structure located at furthest downgradient end, with connection to storm sewer pipe, as the outlet.
* Operation and maintenance cost estimates assume rehabilitation of the swale surface is required after 25 years of operation.
* Operation and maintenance cost estimates assume rehabilitation of the swale surface is required after 25 years of operation.
−* The tool calculates costs for new (greenfield) development contexts and includes costs for contractor overhead and profit, material, delivery, labour, equipment (rental, operating and operator costs), hauling and disposal.
* The tool calculates costs for new (greenfield) development contexts and includes costs for contractor overhead and profit, material, delivery, labour, equipment (rental, operating and operator costs), hauling and disposal.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction.