online_return_period:
Return period T based on risk R and design life n
| Risk R (probability) | Design life n (years) | ||||||||
| 1 | 2 | 5 | 10 | 20 | 25 | 50 | 100 | 200 | |
| 0.01 | 100.0 | 199.5 | 498.0 | 995.5 | 1990.5 | 2488.0 | 4975.5 | 9950.4 | 19900.3 |
| 0.02 | 50.0 | 99.5 | 248.0 | 495.5 | 990.5 | 1238.0 | 2475.4 | 4950.3 | 9900.2 |
| 0.05 | 20.0 | 39.5 | 98.0 | 195.5 | 390.4 | 487.9 | 975.3 | 1950.1 | 3899.6 |
| 0.10 | 10.0 | 19.5 | 48.0 | 95.4 | 190.3 | 237.8 | 475.1 | 949.6 | 1898.7 |
| 0.20 | 5.0 | 9.5 | 22.9 | 45.3 | 90.1 | 112.5 | 224.6 | 448.6 | 896.8 |
| 0.25 | 4.0 | 7.5 | 17.5 | 35.3 | 70.0 | 87.4 | 174.3 | 348.1 | 695.7 |
| 0.50 | 2.0 | 3.4 | 7.7 | 14.9 | 29.4 | 36.6 | 72.6 | 144.8 | 289.0 |
| 0.75 | 1.3 | 2.0 | 4.1 | 7.7 | 14.9 | 18.5 | 36.6 | 72.6 | 144.8 |
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