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 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.

Below are capital and life cycle cost estimates for the extensive, 4 inch deep sedum mat [[Green roofs| green roof]] design 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.

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

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