Table 1: Return period of design event for a temporary structure for different service lives and probabilities of exceedence Service life of temporary structure, T in years Probability of exceedance, p, of design event during service life, T, of temporary structure Return period of design event, Td in years (eq.6) 1 0.02 50 1 0.05 20 1 0.1 10 1 0.2 5 2 0.02 99.5 2 0.05 39.5 2 0.1 19.5 2 0.2 9.5 3 0.02 149 0 0.05 59 3 0.1 29 3 0.2 14 4 0.02 198.5 4 0.05 78.5 4 0.1 38.5 4 0.2 18.4 5 0.02 248 5 0.05 98 5 0.1 48 5 0.2 22.9 10 0.02 495.5 10 0.05 195.5 10 0.1 95.4 10 0.2 45.3 15 0.02 743 15 0.05 292.5 15 0.1 142.9 15 0.2 67.7 20 0.02 990.5 20 0.05 390.4 20 0.1 190.3 20 0.2 90.1 30 0.02 1485.5 30 0.05 585.4 30 0.1 285.2 30 0.2 134.9