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<br /> I'::; <br /> ',',~ <br /> ". oi <br /> ,'.,:$ <br /> ~,:1 <br /> < (~ <br /> ,-,' <br /> .;':~: <br /> "I': 10,000 <br /> .' i,',. <br /> .- 9,000 <br /> 0', " 8,000 <br /> ,.- 7,000 <br /> .~~ 6,000 <br /> '\f 5,000 <br /> 'r" <br /> , 4,000 <br /> 3,000 <br /> ,\ <br /> " <br /> .: <br /> :1 2,000 <br /> ~ <br /> '" <br /> - <br /> U <br /> "\ - <br /> W <br /> " Cl 1,000 <br /> ., a; <br /> f' <( 900 <br /> :J: BOO <br /> U <br /> en 700 <br /> 0 600 <br />I I .~' i: 500 <br /> , <br />,..., ~!'. <br />" , '. 400 <br />, <br /> 300 <br /> 200 <br /> <br /> <br />100 <br />99.99 <br /> <br />// <br /> <br />/ /// <br /> <br />// <br />/// <br />/ //. <br />// <br />// <br />/ <br />/ /p <br /> <br />/ /// <br /> <br />/ /// <br /> <br />/ /// <br /> <br />/ /// <br /> <br />/ /// <br />/ <br />// <br /> <br />;; <br />'" <br />.. <br /> <br />.. <br />, <br /> <br />RETURN PERIOD lyoo..l <br />2 ~ <br /> <br />00 <br /> <br />r!l !II)_ <br /> <br />o <br /> <br />(:) Peak water dischargi <br /> <br />llI-----e <br />&-----.!\ <br /> <br />Volume 01 debril <br /> <br />Peak water and debrie 'discharge <br /> <br /> <br />99.9 <br /> <br />99 96 95 90 80 70 60 50 40 30 20 \0 5 <br />PROBABILITY OF EXCEEOANCE (percent) <br /> <br />2 <br /> <br />Figure d.l. Portland Creek flood frequency curves. <br /> <br />on ;:f ;=. <br />, '" <br />~ .,. <br />,. " :. <br />.... . <br /> <br /> <br />.5 .2.1 .05 .01 <br /> <br />w <br />'" <br /> <br />.M <br />,,~ <br />60 <br />70 <br />60 <br />50 <br />40 <br />30 <br /> ~ <br />20 ~ <br />Q) <br /> - <br /> , <br /> Q) <br /> ~ <br /> u <br /> 0 <br /> W <br />10 ::;: <br /> 9 ::> <br /> ...J <br /> e 0 <br /> 7 > <br /> en <br /> 6 a; <br /> 5 (0 <br /> w <br /> 0 <br /> 4 <br /> 3 <br /> 2 <br /> <br />1A ;; <br />" - <br />.- /, <br />, -. <br /> <br />(' ~4 <br /> <br />, <br /> <br />"::..-1 <br />"f/. <br />....'if <br />, <br />, , <br /> <br />Q <br />Q <br />Q <br />~ <br />ro(, <br />--.J <br /> <br />... <br />. <br /> <br />w <br /> <br />