Changes

==Life Cycle Costs==

==Life Cycle Costs==

Below are capital and life cycle cost estimates for an [[Rainwater harvesting|Underground Rainwater Cistern]], Non-Infiltrating 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 18% of total life cycle costs over the 25-year evaluation period, and increase to 26% of total life cycle costs over the 50-year period, due to increased levels of litter removal, cleaning out of tank, cleaning the in-line filter, replacing components (pump and pressure tank), cistern pump performance testing.

Below are capital and life cycle cost estimates for the below-ground concrete cistern 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 19% of total life cycle costs over the 25-year evaluation period, and increase to 27% of total life cycle costs over the 50-year period, due to periodic cleaning of cistern tank and replacing components (pump and pressure tank).

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

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