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* Operation and maintenance cost estimates assume rehabilitation of the filter media bed surface is required after 25 years of operation.
* Operation and maintenance cost estimates assume rehabilitation of the filter media bed 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.  
** Mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction with equipment needed already on-site.
** Land value and equipment mobilization and demobilization costs are not included, assuming BMP construction is part of overall development site construction with equipment needed already on-site.
** Design and Engineering cost estimates are not calculated by the tool and must be supplied by the user.
** Design and Engineering cost estimates are not calculated by the tool and must be supplied by the user.
** The tool adds 10% contingency and additional overhead as default.
** The tool adds 10% contingency and additional overhead as default.

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