Changes

==Life Cycle Costs==

==Life Cycle Costs==

Below are capital and life cycle cost estimates for the two [[Infiltration trenches|infiltration trench]] configurations 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 38% of total life cycle costs over the 25-year evaluation period, and increase to 51% of total life cycle costs over the 50-year period, due to increased levels of litter removal, replacement of filter cloth and disposal of collected sediment (every 4 - 8 years), cleaning out the catchbasin and the [[Oil and Grit Separator|Oil and Grit Separator/Hydro Dynamic Separator]], annually, as well as flushing the internal pipes every 10 years.  

Below are capital and life cycle cost estimates for the two [[Infiltration trenches|infiltration trench]] configurations 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 38% of total life cycle costs over the 25-year evaluation period, and increase to 51% of total life cycle costs over the 50-year period, due to increased levels of litter removal, replacement of filter cloth and disposal of collected sediment (every 4 - 8 years), cleaning out the catchbasin and the [[Oil and Grit Separator|Oil and Grit Separator/Hydrodynamic Separator]] annually, as well as flushing the internal pipes every 10 years.  

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

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

[[File:25yr LCCT InfilTrench Full Infil.PNG|thumb|left|630px|'''Infiltration Trench: Full Infiltration''']]

[[File:25yr LCCT InfilTrench Full Infil.PNG|thumb|left|615px|'''Infiltration Trench: Full Infiltration''']]

[[File:25yr LCCT InfilTrench Partial Infil.PNG|thumb|center|630px|'''Infiltration Trench: Partial Infiltration''']]

[[File:25yr LCCT InfilTrench Partial Infil.PNG|thumb|center|615px|'''Infiltration Trench: Partial Infiltration''']]

===50-Year life cycle cost break down===

===50-Year life cycle cost break down===

[[File:50yr LCCT InfilTrench Full Infil.PNG|thumb|left|630px|'''Infiltration Trench: Full Infiltration''']]

[[File:50yr LCCT InfilTrench Full Infil.PNG|thumb|left|615px|'''Infiltration Trench: Full Infiltration''']]

[[File:50yr LCCT InfilTrench Partial Infil.PNG|thumb|center|630px|'''Infiltration Trench: Partial Infiltration''']]

[[File:50yr LCCT InfilTrench Partial Infil.PNG|thumb|center|615px|'''Infiltration Trench: Partial Infiltration''']]