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<br />Draft ARR Book VI <br /> <br />8/9/98 <br /> <br />~.. <br /> <br /> <br /> <br />FlOOd <br />Peak <br /> <br />~ <br /> <br />Flood <br />Peak <br /> <br />L~rge~ Rare jt Extreme ~ <br />. . <br />. . <br />, . <br />. . <br /> <br />~ <br /> <br />100 2lOO 10" lOS 10" 10' <br />Anm.lrdilllCE! Probabilityl1 in YI <br /> <br />so lOCI 2000 10' 100 100 10' <br />Annual E~ceedanee Probability (1 inl;t <br /> <br />PMF upper II t of floods <br />thaI could re nably be <br />expected occur <br />PM? Design ftood <br />has same AEP as <br />the PM? <br /> <br />1 :500 limit may be obtained <br />from extrapolation of frequency <br />information <br /> <br /> <br />TypeofcllltaUMf:lfoi'1NcI~riIV", <br /> <br />Credib&iilimilofaJdnipolllllon <br /> <br />~~;:,L~ <br /> <br />A1-silltgaugedllooddala <br />Al-s~e gauged rainfall data <br />AegiorWgaugedllooddala <br />A/.sitegaugedandpaleoflooddala <br />Regional rainlBI data <br />Regional gauged and p"lleollooddala <br />BoIhpaleolloodandrainlalregona'dalaselsan <br />ecb'a lion <br /> <br />..-<:, .... <br />1 in 50 <br />1inlOO <br />1in:200 <br />1 In 5.000 <br />1 in 2.000 <br />lin15.OX1 <br />lm40.COO <br /> <br />mat- <br />1 in 200 <br />lin2CO <br />linlOCO <br />linlO,O:O <br />linl0,cro <br />lin40.0c0 <br />linlOO.OOO <br /> <br />so 100 2000 10' 10' 10' 10' <br />'f A""fE.IlCaedance prfbiJity l1 in :.YJ <br />"', <br />.. <br />Design Rainfalls { Interpolation PM? from <br />from ARR87 Ch 2 .:q Bulletin 53 <br />and Volume 2 ~ GSAM <br />Regional extraBOJalipn GT$M <br /> <br />"~~C~ <br /> <br />" <br /> <br />"'-- <br /> <br /> <br /> <br />Flood <br />Pe'Jk <br /> <br />. Chapter 2 of ARR87 <br />. Volume 2 of ARR87 <br />. Can extrapolate to longer durations <br />. New areal reduction faclors: <br /> <br />~ ,~ <br /> <br />... <br /> <br />'" <br /> <br />,0' '0' 10' <br /> <br />AnnuafE.lccee<lanceProbabililyjl iOY) <br /> <br />" <br /> <br />G- 5 !'t'V,", - <br />C~G m - <br /> <br />:3~1'o..{ " SC4 .5'Yh E: Au ~ f- i~~,f--lCrrc{ <br />j 1 frC;Y::N:.cJ, ~ dnv M 11/J.,"fl1.--f:r?f <br /> <br />Rory Nathan. Sinclair Knight Merz <br /> <br />3 <br />