1 | Length of surge pool with approach for ventilation | 200 + 25 m |
2 | Excavated width of cavern (B) | 20.20 m |
3 | Clear width of cavern | 20.00 m |
4 | Crown level | 250.25 m |
5 | Spring level | 240.00 m |
6 | Surge pit level | 181.50 m |
7 | Height of surge pit wall | 58.50 m |
8 | Height of overburden above crown (H) | 70.75 (average) |
9 | Ground levels maximum and minimum above crown | 321 m and 319 m |
10 | Rise of arc | 10.25 m |
11 | Unit weight of rock (γ) | 2.60 t/m3 |
12 | Average spacing of joints | 0.750 m |
13 | Maximum upsurge level | 239.9 m |
14 | Minimum downsurge level | 214.8 m |
15 | Thickness of concrete lined bottom portion | 300 mm |
16 | Rock ledge between old and new surge pool | 100 m |