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 ($/acre) x Affected Area (acre) | Removal of existing structures, topsoil removal and stockpiling |
| Infiltration area protection | Silt fence cost ($/’foot) x Perimeter of infiltration area | ||
| Clearing & grubbing | Clearing Cost ($/acre) x Affected Area (acre) | ||
| Topsoil salvage | Salvage Cost ($/acre) x Affected Area | ||
| Site Formation | Excavation / grading | X-ft Depth Excavation Cost ($/acre) x Area (acre) | Soil & rock fill material, tunneling |
| Hauling material offsite | Excavation Cost x (% of Material to be hauled away) | ||
| Structural Components | Vault structure (for underground infiltration) | ($/structure) | Pipes, catchbasins, manholes, valves, vaults |
| Media (for infiltration trenches) | Media cost ($/cubic yard) X filter volume (cubic yard) | ||
| Geotextile | Geotextile cost ($/cy) x area of trench, including walls | ||
| inlet structure | ($/structure) | ||
| Overflow structure | ($/structure) | X | |
| Observation well | ($/structure) | ||
| Site Restoration | Soil preparation | Topsoil or amendment cost ($/acre) x Area (acre) | Tree protection, soil amendments, seed bed preparation, trails |
| Seeding | Seeding Cost ($/acre) x Seeded Area (acre) | X | X |
| Filter strip | Sod cost ($/square foot) x filter strip area | ||
| Planting / transplanting | Planting Cost ($/acre) x Planted Area (acre) | ||
| Annual Operation, Maintenance, and Inspection | Sediment removal | Removal Cost ($/acre) x Area (acre) x Frequency (1x / 5yr) | Vegetation maintenance, cleaning of structures |
| Debris removal | Removal Cost ($/acre) x Area (acre) x Frequency (2x / 1yr) | ||
| Inspection | Inspection Cost ($) x Inspection Frequency (6x / 1 yr) | X | X |
| Mowing (for some vegetative filters) | Mowing Cost ($) x Mowing Frequency (6x / 1 yr) |