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<br />TABLE 1 - Nationwide Flood Frequency Studies Conducted by the
<br />U. S. Geological Survey
<br />
<br />4.5 rirLlt Tr,;trm ;:Hm~::~r; rttDlffiillffiOO liFII"
<br />II. '~" "~' ,Ct~ 'I ~SFtE.lEI~ 'l"~
<br />1;:: ,', ::': IHillll.,trf. 1+.:.', ..:C.'Llt"~.l ffc.1.s:TmGll . . rc>c>~
<br />I if itS'I',JIII". 111'''':"11 ":'!+foe;; tt~m CLt~ ,,'\!~,
<br />I : ;t~t~t~,. -:~::: ~~ .~::;- ~~-~m-~i- , ,- g' ~~~~ ~'f
<br />I I ~~':-, ........ .,." ~. ;-H. HH- ..,.. r. r.
<br />..~ :"'++_~_d: :1;+ + ..: .+ r-- '(J~' ", ~ +
<br />4.0 "I1>:m titl H'; ,I'''t', .t~~ ""',,......,<;. .dtl.
<br />1- r Jil -tl'rH:IJ W-~ .I-f-l--, .:-:- ;::-1. ft. '~EI! .....- .~i+.~ttl
<br />+fn- p-;::.:. i-+L~H~n ,,~:.-ttL:. :.::;., -+ r';'T;-t ffi 'I + I r- ~H--:-::' -j ..
<br />.::~ ;.:--t:~ ~l::' .,. -~-: -;::,--~ :1" U,i'TH' t:~ 1.Itl:} U.: ~.t.;~ T~
<br />-i-lf.Jf~*-ffi:tttffi~:~~ tll.t'.. +:1 ~t. t -m
<br />I~.~fi@' L~ m : q I. rr:~' tt1
<br />I' . :::u- - III' _.-- __ I
<br />3 5 . +.L-l- ~ t'- I ~H_....... ~- ,,', I 1-1: ~
<br />. r, +,:::::----- c,r.:'::':~" ""n--; ~T;~ j ~
<br />j' f' CLT, .., ,. 'c;' f:+= cti, "+1 m.. >fri':+ttt I ~
<br />1,< ' '~~.I'J+..'. m.:'. '.~:':1 :1 :~:;".;.I'.':' .' H~\-OC>~
<br />~ . "" lit. ,. ",,~="H '~"""ili
<br />3 "Lt- ' 4, ' -; ,) - ,t , +..:+ t"~"{~ ~
<br />4.1 ::!-:-":-:-7:;.:':-=-:-;l.!.-:-"-:'-':'''' 1 - r,l. t()~~o-+-t .-
<br />;,] },O ~'<~f.' ;~~ w;; ;'I.ffij ',g~-: 12. ' . ",-" ~'
<br />5 I~ ~.~~ ~~~.'f:;~ ie.. ..=' ~ :;.' I'. ..
<br />~ it! j" ._, t:--t'11-t" -0'. ~ t H
<br />Ci '++~::;--=-:!.1" !-It-::'J'~ ~/- jl ,-/-"1'
<br />-~.2' :-::-~ .;~:. ,.".-r ',:: :5] -+ ,_ I. ~. , ~;::;
<br />p
<br />~ :_I"'-~:_'(' fI+ :Hi---:i -l- t-- -'- ~~ " >-'~~ H - ~OJ~-
<br />H '.~tt+:t7:J_ --4- +-~!. "j -, ~ R r)..o~;
<br />,...:J 2.5 :f1 : .~.j:U +_;~+ ~ tiH-~-~.j ~ >- un 100"~~ , t [,.:
<br />~ It + .r>' ",..;' +It,fi/,,.,''.. '- =I+tl ,~; rt:; "'lltiHT'+
<br />~ '-fi.ri' :fE- PI :~'!=tt.f! :'1 ~ .'r" 11 F' I' ++ti- f'rrt t::
<br />,:-~ --'- - ...:;f ._' r::":: f~trl1t i p- ~~ W~ t to ~S-j ;.~ ~:~
<br />I,)--r- ::;.::' ;;i Jtt1 i! T' I--' ~:7f ; ~t-tttr 11:-:- .:::::t1 l ~,~: ,j->- :.1-:- 1 'n1 ill.;
<br />I ~ ;:i/;_ 7,:".~---H-j:-i-' ;1::" ~-:': ITitt_':tz ~-r-" .. 't ~=: .n' :;::;::::r'; .~.;.++ ~ ,--t-
<br />2 ,0 1 'H'., t:I: . e+: " ~. ~: "~'T=::O l:: l*ilt'r -:o'=: ;~ ifri ,,; l+..j:;
<br />r Ilt/,,;; :.t--J:+ ~ e+;::::: .,._ -....... .___ ..+ t+ +1-1- -I--I--j
<br />'l"ltr .;-;1 'iit JH:.::: '~Ti;!ili:F1Jrr;1l.;lf 'lei litt!.crC;OD"
<br />:~_I'IJ":':"~ ',~. 1.,1 +J.~' + tH 50-'lEJ\R FL
<br />'fJi";I p.... ,t... 1 j~tLH I'
<br />",:1;;:: .:-:~ .;;: - 'i'-:- ~ I, j t',--::t -'--'~ -rr1l~ Tt fi-:'
<br />':" ,:::;;.+;. Hf' '..' ". '+hci:lj' t~ ~ ."",., '1+ 111.' ++ I'" !J;,
<br />A'1; ~~!-;'.ir.:~+:r-I~_::::;" .:~11'l:1-i' ;:::::_ m :.;,1 t+..,~ ~t:t1
<br />1.5 'lit':<+L:i"-"'1 'it; t1+II,Oo ~ .." '.~ 1, I f ~
<br />:..t-~~ t'THi ;.!l~ .+. - -+-.ttrF~';:
<br />-(:" ., ~::Sd;;::;::;:H IiUjii' "";. ~I" ;'. Ii :ii,. 1:.-.;
<br />,.... .Tfhlt '"c, "'-'~~.., , ~ .' Itrt:""l c;.~
<br />i!H h-d:~:., tr- ttm ' <- ++ r:;t.:..u
<br />Inrn 'H iffiEf!,' '. +. '25-YEAR FLOOD'"
<br />1.0 '6tl1'~h ,t! t!t! ,i-i-: ,.C ::::t.:._I- .. "
<br />
<br />-2.0
<br />
<br />Water
<br />Supply
<br />Paper
<br />No. Part Date
<br />
<br />Area of Cov~rage
<br />
<br />1671 I-A 1964
<br />
<br />North Atlantic Slope Basins, Maine to Conn.
<br />
<br />1672 l-B 1968
<br />
<br />1673 2-A 1964
<br />
<br />1674 2~B 1966
<br />
<br />1675 3-A 1965
<br />
<br />1676 3~B 1964
<br />
<br />1677 4 1965
<br />
<br />1678 5 1968
<br />
<br />1679 6-A 1966
<br />
<br />1680 6~B 1968
<br />
<br />1681 7 1964
<br />
<br />1682 8 1965
<br />
<br />1683 9 1966
<br />
<br />1684 10 1966
<br />
<br />1685
<br />
<br />11
<br />
<br />1967
<br />
<br />1686
<br />
<br />11
<br />
<br />1967
<br />
<br />1687
<br />
<br />12
<br />
<br />1964
<br />
<br />1688
<br />
<br />13
<br />
<br />1963
<br />
<br />-1.0
<br />
<br />o
<br />SKEW (G)
<br />
<br />+1.D
<br />
<br />+2.0
<br />
<br />1689
<br />
<br />14
<br />
<br />1964
<br />
<br />FIGURE 2 - NORMALIZED DISCHARGE SKEW CURVES
<br />
<br />6
<br />
<br />North Atlantic Slope Basins, New York to
<br />york River
<br />
<br />South Atlantic Slope Basins, James Riv. to
<br />Savannah Riv.
<br />
<br />South Atlantic Slope and East Gulf of Mexico,
<br />ogeechee Riv. to Pearl Riv.
<br />
<br />Ohio Riv. Basin Except Cumberland and Tennessee
<br />Riv. Basin
<br />
<br />Cumberland and Tennessee Riv. BasinS
<br />
<br />St. Lawrence Riv. Basin
<br />
<br />Hudson Bay and Upper Mississippi Riv. Basins
<br />
<br />Missouri Riv. Basin above Sioux City, Iowa
<br />
<br />Missouri Riv. Basin below Sioux City, Iowa
<br />
<br />Lower Mississippi Riv. Basin
<br />
<br />Western Gulf of Mexico Basins
<br />
<br />Colorado Riv. Basin
<br />
<br />The Great Basin
<br />
<br />Pacific Slope Basins in California, Vol. 1-
<br />Coastal Basins South of the Klameth Riv. Basin
<br />and Central Valley drainage from West
<br />
<br />Pacific Slope Basins in California, Vol. 2-
<br />Klameth and Smith Riv. Basins and Central
<br />Valley drainage from East
<br />
<br />Pacific Slope Basins in Washington and Upper
<br />Columbia Riv. Basins,
<br />
<br />Snake River Basin
<br />
<br />Pacific Slope Basins in Oregon and Lower
<br />Columbia Riv. Basins,
<br />
<br />7
<br />
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