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Determination of β1 and β2 with slope angle α.
| Slope angle α | Slope ratio 1 : m | β1 | β2 |
|---|---|---|---|
| 60° | 1 : 0.58 | 29° | 40° |
| 45° | 1 : 1.0 | 28° | 37° |
| 33°41′ | 1 : 1.5 | 26° | 35° |
| 26°34′ | 1 : 2.0 | 25° | 35° |
| 18°26′ | 1 : 3.0 | 26° | 35° |
| 14°02′ | 1 : 4.0 | 25° | 36° |
| 11°19′ | 1 : 5.0 | 25° | 39° |
