Changes

==Overview==

==Overview==

Accurately estimating the life cycle costs for low impact development (LID) practices can be a costly and time-consuming process. The LID life cycle costing tool (LCCT) facilitates this process and allows users to produce realistic cost estimates based on user-specified LID design and economic information. The LCCT provides cost estimates for the [[construction]], [[Inspection and maintenance|inspection, and maintenance]] of LID stormwater practices.

Accurately estimating the life cycle costs for low impact development (LID) practices can be a complicated process. The LID Life Cycle Costing Tool (LCCT) helps make this process easier and allows users to produce realistic cost estimates based on user-specified LID design and operation and maintenance assumptions. The LCCT provides cost estimates for the [[construction]], [[Inspection and maintenance|inspection, and maintenance]] of LID stormwater practices over 25 and 50 year timeframes.

Originally released in 2013, the most recent version of the excel-based tool (Version 3.0) includes the following new features and updates:

Originally released in 2013, the most recent version of the Excel-based tool (Version 3.0) includes the following new features and updates:

*Increased transparency and usability. Users can now access the tool’s back-end to modify assumptions, unit costs, design defaults, etc.  

*Increased transparency and usability. Users can now access the tool’s back-end to modify assumptions, unit costs, design defaults, etc.  

*[[permeable pavement|Porous asphalt]] was added as a LID practice. Additionally, this tab allows for cost estimations for conventional asphalt so that direct comparisons can be made with LID practices.

*[[permeable pavement|Porous asphalt]] was added as an LID practice. Additionally, this tab allows for including conventional asphalt in the contributing drainage area up to a 1:1 impermeable to permeable area ratio.

*Cost estimation for [[dry ponds]] has been added to LID practices. [[SWM ponds|Wet ponds]] are also included as a traditional stormwater management strategy in order to facilitate direct comparisons with LID.

*Cost estimation for [[dry ponds]] has been added to LID practices. [[SWM ponds|Wet ponds]] are also included as a traditional stormwater management strategy in order to facilitate direct comparisons with LID.

*Updated line costs to 2018 based on RS Means data and information obtained through consultation with suppliers and project managers.

*Updated line costs to 2018 based on RS Means data and information obtained through consultation with suppliers and project managers.

You can find practice-specific life cycle cost estimates for each LID BMP type listed below. Each page provides a brief overview of the design assumptions and summarizes net present value estimates of construction, and life cycle operation and maintenance costs over 25 and 50 year timeframes, in Canadian dollars.

You can find practice-specific life cycle cost estimates for each LID BMP type listed below. Each page provides a brief overview of the design assumptions and summarizes net present value estimates of construction, and life cycle operation and maintenance costs over 25 and 50 year timeframes, in Canadian dollars.

To read more about the specific design and operation and maintenance assumptions for each estimate, please see below:

To read more about the specific design, operation and maintenance assumptions for each estimate, please see below:

*[[LID LCCT: Bioretention]]

*[[Bioretention: Life Cycle Costs]]

*[[LID LCCT: Permeable Interlocking Concrete Pavers]]

*[[Permeable pavements: Life Cycle Costs]]

*[[LID LCCT: Porous Asphalt]]

*[[Porous Asphalt: Life Cycle Costs]]

*[[LID LCCT: Infiltration Trench]]

*[[Infiltration Trench: Life Cycle Costs]]

*[[LID LCCT: Underground Infiltration Chamber]]

*[[Infiltration Chamber: Life Cycle Costs]]

*[[LID LCCT: Enhanced Swales]]

*[[Enhanced Swales: Life Cycle Costs]]

*[[LID LCCT: Rainwater Harvesting]]

*[[Rainwater Harvesting Cistern: Life Cycle Costs]]

*[[Green Roof: Life Cycle Costs]]

<small>'''Note''': All practice cost estimates are based on a Contributing Drainage Area (CDA) of 2000 m², 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.  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 m², runoff control target of 25 mm depth (retention or treatment), 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 land value, equipment mobilization/demobilization costs, nor additional costs associated with retrofit/redevelopment scenarios.  Operation and maintenance (O&M) 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:''' Click on each image to enlarge to view associated life cycle cost comparison results.</small><br>

==References==

==References==