Difference between revisions of "Cost-benefit considerations for Infiltration trench"
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The table below lists the specific site components that are specific to [[Glossary#I|infiltration]] practices. Not included in this table are those cost items that are common to all construction projects, such as mobilization, traffic control, [[Glossary#E|erosion]] and [[Glossary#S|sediment]] control, permitting, etc. | The table below lists the specific site components that are specific to [[Glossary#I|infiltration]] practices. Not included in this table are those cost items that are common to all construction projects, such as mobilization, traffic control, [[Glossary#E|erosion]] and [[Glossary#S|sediment]] control, permitting, etc. | ||
| − | {{:Infiltration | + | {{:Infiltration practices cost components}} |
Revision as of 00:34, 24 March 2013
The section on integrated stormwater management outlines a cost estimation method which site planners could use to compare the relative construction and maintenance costs for structural best management practices. These curves are excellent for purposes of comparison; however, it is recommended that construction and maintenance budgets should be based on site specific information. Utilizing the table below and the cost estimation worksheet, will allow designers to avoid over or under estimation of fixed costs.
The table below lists the specific site components that are specific to infiltration practices. Not included in this table are those cost items that are common to all construction projects, such as mobilization, traffic control, erosion and sediment control, permitting, etc.
Summary of infiltration practices cost components.
Link to this table
| Implementation Stage | Primary Cost Components | Basic Cost Estimate | Other Considerations |
|---|---|---|---|
| Site Preparation | Tree & plant protection | Protection Cost ($/acre) * Affected Area (acre) | Removal of existing structures, topsoil removal and stockpiling |
| Infiltration area protection | Silt fence cost ($/’foot) * Perimeter of infiltration area | ||
| Clearing & grubbing | Clearing Cost ($/acre) * Affected Area (acre) | ||
| Topsoil salvage | Salvage Cost ($/acre) * Affected Area | ||
| Site Formation | Excavation / grading | X-ft Depth Excavation Cost ($/acre) * Area (acre) | Soil & rock fill material, tunneling |
| Hauling material offsite | Excavation Cost * (% of Material to be hauled away) | ||
| Structural Components | Vault structure (for underground infiltration) | ($/structure) | Pipes, catchbasins, manholes, valves, vaults |
| Media (for infiltration trenches) | Media cost ($/cubic yard) * filter volume (cubic yard) | ||
| Geotextile | Geotextile cost ($/cy) * area of trench, including walls | ||
| inlet structure | ($/structure) | ||
| Overflow structure | ($/structure) | ||
| Observation well | ($/structure) | ||
| Site Restoration | Soil preparation | Topsoil or amendment cost ($/acre) * Area (acre) | Tree protection, soil amendments, seed bed preparation, trails |
| Seeding | Seeding Cost ($/acre) * Seeded Area (acre) | ||
| Filter strip | Sod cost ($/square foot) * filter strip area | ||
| Planting / transplanting | Planting Cost ($/acre) * Planted Area (acre) | ||
| Annual Operation, Maintenance, and Inspection | Sediment removal | Removal Cost ($/acre) * Area (acre) * Frequency (1 time per 5 years) | Vegetation maintenance, cleaning of structures |
| Debris removal | Removal Cost ($/acre) * Area (acre) * Frequency (2 time per year) | ||
| Inspection | Inspection Cost ($) * Inspection Frequency (6 times per year) | ||
| Mowing (for some vegetative filters) | Mowing Cost ($) * Mowing Frequency (6 times per year) |