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<br />froJ::L !"ecords so ndJ'.l.sted. "lc.r-durat:on cu.r":es and tables, ....hich
<br />sho.... :te l'ercer.te..~e of tite ~:"'~.- .~.: '.~:' -;isc1.eryes cf' \'arioc.s I:l.aV1itUC.t:.~
<br />have be~:" equt..lerl or exc(:ed~c: rl,l:' rl .~ 44_yeer bf::.se f"!ricd, "..ere devel-
<br />or-ed for l!';a."l: n:' :.:e stre!l!,..;$ ir_ "tne 3:.n. nfUr~ 1 $:1:')"'5 such ~lo'J-
<br />dura~iotl curveS for fOur r.trea.r:<... ~le!. erraye :'.~ dc.r"'_:.io.; char'.:lc-
<br />te:-:s....ics of tl",ese saze str~U::-:5. end ot~~ers, in sta.tist.icel for:;,
<br />Si=-.il:l!' flo..-c.~!:.ticm -::urve~ 1'<',1 tables vere develt)pea ::cr ::;P.r.:: Jt~er
<br />Qtrea.~ '1tlltions i:-: ti;e ~~in. :::-0::1 thcce the fl.VerQbe been} ....!.....f'I" dis-
<br />Ch:H..~es dtztne; t.he sta.::1;~rd :,e:"'ioa. ..,er~ detern1~<:d 0:' r.:.ri th:!.etic inte-
<br />O"9.tic:::. of tte '!.:-~n5 under the several curves.
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<br />F',:" ~n,'" '~rea:::.s in t..~ t-~:"in. Jifferent 5:."1. ad ...:;'''',f?S of t~e
<br />flo....-d..l!"!1t'! <"I Cl,;,r"e: cna!'1.ct~.rize ',:. :~fects ~:~ en. irQ.~ ... '[1 fe9t~res
<br />, 1.;-,e' be:o.V'iC'r ~.L sr.r:'at:>, ......J:;. ~O::" =-t:-e\,~'.:> ',':; '!; ~,,: is lar~-:~ly
<br />:::Jelt......l.'ter ~rc:-: s;.,':n.1? curv(:s sue" as t.~0S';:' of 1-. _-C"f ;,1::." '1 flat slooe
<br />at tlle upner, or ..ie~-1isc~1H.r['e ~;~~,a.:1d f.c ~:t.ir.:.~' _:tcer- :1(;.2 if; t"1e
<br />centr"\l Hl.r~. ':rt~;"'r, 0. det;:., ly y. '';!:7.s.t'?d ;:rftilllt..~ 'J.!'e:.. 'v".:nds to
<br />:'llt~, 'n. a.;''::'!''_ o.rs. 11 'l!- '.'t t ~'.. _J:e t '~o 3'.eo.:';:oe:~ t~~ '.l.npe:- ;-,art
<br />of th.:: ct:.rve. '.',..t.!,; ..r~r.:! thut lir:~..l. .r' s und,'rlai:; bY !'€'rr:,~nbl' earth
<br />t:1l'tcrials, le f'lo...-jt:.r ::. c'JIves t,en:i~' ~)t:> rcl~t i n.ly :,ori::.ontnl--
<br />h&.~, :''', t!. fl.,",,:~ r~lat ,re:" u'J~forrr!, ;s i.=; 'bC:':3J.se t~.P nc,~,~able
<br />~c'r-:::",t.ions l\ct a.:> '~ou".j-'-'''- t.cr r-:!'zc~\'~ir:' " ,ic~ ""ir::." -.;. t~in 71 .r:' of tr.e
<br />:;: reei ,i ~').t, d or z~v..-':~. -It ,Jc'+_e:- ,1.;),:1 t :C:1 ro;1(;~_5~~ ..~a~ wt't.,~r r,':--;:,d'J.'llly to
<br />:-:,_intl:1il'. 3tre!l:Olflc'", 'J. .rir,,~ t c a.-:," ~~3.s"n. 'It. t..1f" )t~.;'r r.Ri::J. if t;~e
<br />dr~i:1,i'" tl!U'.i" II is U;l'...t ,'lain t,.. ir'>"Je-:- :~-~t:l',~ roc..Z, t.:>:- .1. ~r _,a~'+_ ,--.f the
<br />cur"'~ i.- sto;;CD. So ~i :..:ri"tlil:nt ~<1. ,,".ll.~rr)Us t=" .r'- cr ,'. e:-:,i;.t.r:nt s1.ream-
<br />"10'.1 J'eo..:ord.s could' ,:1~3~if.i.',:.i E':~ccr..:.inf" ~I.; (~~,1in~,-e tr!:in e:.'/:.r')r.-
<br />...~,. ",r.-:!. ~CC'.:rrd':1'" !,.'!. lr,ter'-T"o:tations 01 e-r-:p.ml i.' cl-H~:~ctc~'isti::s
<br />c .~::,j te extcl,ced L":.h !:Cit"e R:;su:-anc'J.
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<br />One ....ari.icul:\r en'li rC',,"':'er. :.1 :',,='j+ '~r" :!: estleciall:: i n~'o~::lti ':e i:1
<br />exten.lil~p: the i "lte!"-r~t~ticn c" l.e:--,)'...w:!. i ty c:-,erttC~ "r-i ..t.~ ..:~__.~:!eci :"1-
<br />c.')lly, .te ! rcent -:.e of Y"'c.rlv ..(:!" Liis('~ I'l.ro;t' ".,at CC'':l. c. base :"10....
<br />i:1 the streW'".... 7:1.i:; ba~e. dy-r.tc.tc ~'L''''. i +1-:"l1,. w~li'Z:-. is r-re-
<br />5'::....,i tc 'to cr ~"~l~.. f:r':'r.' ..;off',u, to -:-ot.rc ':.t..t!;',' r~~t r t ';: :::r0~ i~..::::ledi-
<br />'l.t:;oly ,..r:tecea.~nt ~rf'c:.r:ito.tio_ :- sr.o'" r.:.e:!.t.. Its ar.\~U=.;" :.S C0: !1ted
<br />f:ror: fl. w-dur~ti ~~ c3n.te. by l:;Ct:l0d.; ~c.' :re- det'1ilcG.
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<br />_':_":l~:'I; 5) t'8~t of o!'.e l;'ry.;-!," 3a;-;1'1.
<br />ra::;-es tet,;( ~n ') ,t'.'~ 6~ 'e:rc;;,~t :>f FlVcr!
<br />r.~r.r-..:!.i:.~.,t;. exni,n... is =---=5'- "'__-:l't;l;';, n'
<br />hc.s? ~lc"". ~'1e 't<~.. i:, o:~ -:.-:.;.s crp i:.;....
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