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Table 2
Guidance values for UWV durability design.
| VariableA | UnitsB | Target value for sequestration durabilityC
|
MRVD notes | ||
|---|---|---|---|---|---|
| 100 y | 1000 y | ||||
| Kgw | Groundwater hydraulic conductivity | m/s | ≤1 × 10−9 | ≤1 × 10−10 | These variables address the groundwater-incursion suppression requirement. |
| LC | Confining layer thickness | m | 1 to 3 | 10 to 30 | These target values apply to the sub-surface confining layer which separates the UWV from the nearest aquifer. |
| Ksi | Surface hydraulic conductivity | m/s | ≤5 × 10−9 | ≤5 × 10−10 | These variables address infiltration by surface water. |
| LCl | Cap thickness | m | 3 to 3.2 | 3.5 to 5 | These target values apply to the surface cap of sediments or soils covering the top of the UWV. |
| PGA | Peak ground acceleration | % g(m/s2) | 9% (0.88) | 9% (0.88) | This variable defines the maximum expected seismic energy input through ground shaking. |
| PGD | Peak ground displacement | m | 0.012 | 0.012 | This variable defines the maximum expected size/shape distortion of the UWV created by seismic energy. |
| VWBB | Void space around buried wood | Percentage of total volume | 25% | 50% | Gas containment is maximized if the void space is at least partially filled by loose, smectite-rich clay. |
A
Refer to Figure 1 for physical context.
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