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<br />"'" <br />N <br /> <br /> 4,500 -1- OJ <br /> .... <br /> ~ <br /> '" <br /> 4,000 -- (J1 <br /> - . <br /> ~ <br /> '" <br /> () <br /> 3,500 '-- ~ <br /> " <br /> '" <br />+' ~ <br />'" () <br />'" '" <br />'H -- <br />I .... <br />'" 3,000 ~ <br />H or <br />() '" <br /><Il ~ <br />'H l1> <br />0 f--' <br />'" 0 <br />'{j 2,500 H, <br />@ III <br />'" ~ <br />~ <br />0 <br />.<:: l1> <br />+' f--' <br />s:1 2,000 H, <br />'n f--' <br />~ ~ <br /> '" <br />rl <br />'H =--1: . r1"mr - l1> <br /> or <br />rl l,500 <br /><Xl OJ <br />j ~ <br /> () <br /> 0 <br /> ~ <br /> l,OOO i <br /> '" <br /> .... <br /> c+ <br /> (l) <br /> . <br /> 500 <br /> -, <br /> C <br /> c:' -, <br /> l'."'0 <br /> ( > 1.01 1.1 '2 " 1.4 1..5 . 3 4 , . 1 . 9 '0 20 '0 40 '0 100 200 <br /> ~. Recurrence interval, in years <br /> CJ <br />