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Low Impact Development Life Cycle Costing Tool (view source)
Revision as of 16:33, 5 December 2022
, 1 year agono edit summary
<small>'''Note''': All practice cost estimates are based on a Contributing Drainage Area (CDA) of 2000 m<sup>2</sup>, runoff retention or treatment depth of 25 mm, and a drainage period of 72 hours. For infiltration practices, native soil infiltration rates for Full, Partial and No Infiltration Design scenarios were assumed to be 20 mm/h, 10 mm/h and 2 mm/h, respectively, and a safety factor of 2.5 was applied to calculate the design infiltration rate. Construction cost estimates assume the practice is built as part of an overall greenfield site construction project so do not include equipment mobilization/demobilization costs, nor additional costs associated with retrofit/redevelopment scenarios. Operation and maintenance cost estimates assume annual inspections, removal of trash and debris twice a year, removal of sediment from pretreatment structures annually, and removal of weeds twice a year (where applicable). 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 (where applicable).</small>
<small>'''Note''': All practice cost estimates are based on a Contributing Drainage Area (CDA) of 2000 m<sup>2</sup>, runoff retention or treatment depth of 25 mm, and a drainage period of 72 hours. For infiltration practices, native soil infiltration rates for Full, Partial and No Infiltration Design scenarios were assumed to be 20 mm/h, 10 mm/h and 2 mm/h, respectively, and a safety factor of 2.5 was applied to calculate the design infiltration rate. Construction cost estimates assume the practice is built as part of an overall greenfield site construction project so do not include equipment mobilization/demobilization costs, nor additional costs associated with retrofit/redevelopment scenarios. Operation and maintenance cost estimates assume annual inspections, removal of trash and debris twice a year, removal of sediment from pretreatment structures annually, and removal of weeds twice a year (where applicable). 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 (where applicable).</small>
==Comparison of Life Cycle Costs by BMP Type==
The following bar charts compare construction and life cycle cost estimates by LID BMP type for three main design scenarios: Full Infiltration Design; Partial Infiltration Design; and No Infiltration Design. Design and O&M assumptions for each BMP type and design scenario are as indicated in the above note. All cost estimates generated by the LCCT have been divided by 2000 m<sup>2</sup> to produce values in Canadian dollars per square metre (CAD$/m<sup>2</sup>) of Contributing Drainage Area. Cost estimates for a 2000 m<sup>2</sup> asphalt parking lot serviced by two catch basins and an oil and grit separator (OGS) are also provided for comparison.
Construction Cost Comparisons:
[Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Full Infiltration Design, 25 mm Retention]
[Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Partial Infiltration Design, 25 mm Retention]
[Construction Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - No Infiltration Design, 25 mm Treatment]
Life Cycle Cost Comparisons:
[Life Cycle Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Full Infiltration Design, 25 mm Retention]
[Life Cycle Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - Partial Infiltration Design, 25 mm Retention]
[Life Cycle Costs Per Unit Drainage Area (CAD$/m<sup>2</sup>) - No Infiltration Design, 25 mm Treatment]
==References==
==References==