Changes

==Life Cycle Costs==

==Life Cycle Costs==

Below are capital and life cycle cost estimates for the [[Green roofs]] with a No Infiltration configuration over 25- and 50-year time periods. The estimates of maintenance and rehabilitation (life cycle) costs represent net present values. Operation and maintenance costs are predicted to represent 45% of total life cycle costs over the 25-year evaluation period, and increase to 59% of total life cycle costs over the 50-year period, due to increased levels of litter removal, watering (establishment period - years 1 & 2 / annually and / drought watering) cleaning out and vacuuming of the catchbasin, mowing, replacement of sod, weeding and pruning of the BMP's planted [[vegetation]].

Below are capital and life cycle cost estimates for the [[Green roofs]] with a No Infiltration configuration over 25- and 50-year time periods. The estimates of maintenance and rehabilitation (life cycle) costs represent net present values. Operation and maintenance costs are predicted to represent 4% of total life cycle costs over the 25-year evaluation period, and increase to only 6% of total life cycle costs over the 50-year period. Maintenance costs associated that make up a smaller percentage of total capital include, litter removal, watering (establishment period - years 1 & 2 / annually and / drought watering), weeding and pruning of the BMP's planted [[vegetation]], plant replacement starting in tear 2, green roof irrigation line testing, membrane leak detection testing and repair of the membrane starting in Year 10.

===25-Year life cycle cost break down===

===25-Year life cycle cost break down===