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<br />+ <br /> <br />I. <br /> <br />II. <br /> <br />IlL <br /> <br />IV. <br /> <br />V. <br /> <br />CONTENTS <br /> <br />Forward.. .... ... ... .... ...... . <br />Hydrology Committee........... <br />Page Revisions to Bulletin 17. <br /> <br />Introducti on. "."""". " """ ."" "." ". ." "". . (>' I)'"'' .". ." . . .", . . .. . <br /> <br />Surnrnary.. " "" " """ .. 0 .. ... . (I' . . 0 .. "" """ """ """ "" 0""" "" ... . " " . " <br />A. Information to be Evaluated"oooooo"."ooD"...."oo"."".... <br />B" Data Problems". o. 0 ""." 0" " . .. "", (I """... " " ". .... . ." . .. . . ". <br />C. <br />O. <br />E. <br />F. <br /> <br />Determination of Frequency Curve.o.co.."..."."."."...... <br />Re 1; abi 1 i ty App 1 i cat; ons" ." "" """. . (I .. ". ".." """ ".. . ".. . " . <br />Potpourri" " . . . . . 0 . . . " . . . . ." . . " " " " . " "" " " " " " . . . " . " " . . . . . . . <br />Append; x" " " . . " 0 "" " " " . " " . " . . . . " " " ". " " " <> " " " . " . . " . . . . . " " .. . <br /> <br />Information to be Evaluated.oDD".ooo.".oooooo"....""........ <br />A. Systematic Recordsoooo..oo.oo.ooo.ooo.oooo.oooooo....ooo <br />B. Hi stori c Data. 0 0 0 0" 0 0 o. 0.000.0.0....00" 0 0 0'" 0 0 0 0 0 o. 0""" <br />C. <br />D. <br /> <br />Comparisons with Similar Watersheds..................... <br />Flood Estimates From Precipitation...................... <br /> <br />Data Assumptions" 0",,0.0... ..00 "00 0..0....0.0.0000. .00 0'" 0 .., <br />A. Climatic Trends..o."..o"oo.ooooo.o..o.ooooo....o.".".... <br />B. Randomness of Events."..""..oo."o.ooooooooo.".o."."...." <br />C. Watershed Changes.. 0'00'" 0 0" 0"'"'' 0" 0 0" 0 0 0" 0 0" 0 0 0 0 0..0... <br />D. Mixed Populations..."o....o"oooooooooooooooo.o".ooo..oo. <br />Eo Reliability of Flow Estimates.."oo.oooooooo....oo..ooo.o. <br /> <br />Determination of Frequency Curveooo.."o......oo....o...o.... <br />A. Series Selection"... 0 0 0.. 00.0 .00.0.0..0.0000...... .00.... <br />B. Statistical Treatment..."..oooo..........o.o.o.".....".. <br />1. The Di stributi on"" 0 .. .. " .." o. . ..00. "u 0.. " ", "" . 0 ...0 <br />2. Fitting the Distributiono.o...o."o"".o..o"."..o.ou". <br />3" Broken Record.".. 0 0" 0'''' 0 0'0'''''''' 0".................. <br />40 Incomplete Record.".o....co.".""oo.oo.""oo..o"o..oo <br />5. Zero Flood Years. o. "., . ." 0 . . 0 0.000"" 0"" 0 0 . . 0 . . . " . . . <br />6. Mixed Populations.o."oooooooo.".".".oou....o..."o.." <br />7. Outl iers 0".... 0"....." 0'''''' 0" 0" 0.0' 0 0 0..." c. c c. o. c. <br />Refinements to Frequency Curve.ooooc.cooo"o..oo.ooo..o.. <br />10 Historic Flood Oataooo"oooo.c.".oo"ooo.o"ooooo.oco.. <br />2. <br />3. <br /> <br />C. <br /> <br />Comparisons with Similar Watersheds................ <br />Flood Estimates From Precipitation.................. <br /> <br />vi i <br /> <br />Page <br />i <br />i i i <br />vi + <br />1 <br />2 <br />3 <br />3 <br />3 <br />4 <br />4 <br />4 <br />4 <br />4 <br />5 <br />5 <br />6 <br />6 <br />6 <br />6 <br />7 <br />7 <br />7 <br />8 <br />8 <br />9 <br />9 <br />9 <br />14 <br />14 <br />14 <br />15 <br />16 <br />17 <br />18 <br />18 <br />19 <br />