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<br />L~•y•,/iu~. i,.• ,~. .,.. .,. ~.:ail„~,I r oln l: inter. b. ~~rnc,~ann~.
<br />m 1... ¢a: v:+l n•n : . L'a: ~. rn .i.rre n. rn •:v~:~.1 cnn: Jl ,~. ~.. „
<br />li ryurrJ rbu0^
<br />vniy dart on minimum loss r:,tes for ~i\'en soils
<br />turd roe ~•r ~cn:'oi::atcr.s need be Celt rnl'.ned.
<br />Fit'cro!o~ists of the Svil Cmarrcation Scn-
<br />irc• cur.;nnt!r encounter the proLlcm of esti-
<br />n:a;ir.~ direc: runoff \\~here no record.: ;u~e
<br />:nai!:1ble fur :ne si/rcif:c o:;lter;hed. A; a re-
<br />salt, a ;:rner:l! ;,rocedure for est:mating direc:
<br />runutf ha< L.cn de\rluprd to meet Soil Con~er-
<br />\:uiun Scr\ac Wert!<. Di:cu~~iuns rel,r,ing to
<br />th:~ proclriurc t:1k~r. from the "I[ycirvi~l;•;:
<br />t;uiJr fur L;2 in \Cntcr<hed I'lannut;;." ;1nd
<br />the !a[rr puil!ic•a.t:on. "I';:droiop}', I':n't I-
<br />\,'atcrs'r.cd P!cnning," pabh;hed L;: the Soi!
<br />Cumcnatfon Venice (~cc biblio~raphc, s2c.
<br />Gll} ;:re ~h•~r.:n appendix A. ~ feature of the
<br />Soi! Con~rr'..::ion ~c:~ic•c met'nud that ;hocld
<br />pro\'e par:ic:,!.:rl> [:<~tful is the classification of
<br />:,bout ~,t10u ,oily nt the C'.^.itrd Scttc; into
<br />four hrdrolcr.c <rrl .rates reprc_enti^;; a pro-
<br />~rc><:on in dr~ro~ ui rtu:~~:i putCni:al :l'O:n n:~^
<br />to io\\'. ~.'.:hc~~;1 :hv Su:1 Cvnscrcation S~r';-
<br />ice prnrer!::re ivr esum:.:ink direc.: racuc' :..._
<br />bren se!rctrd for c>e in this text dui to its sm-
<br />plicitc, m,odii:f•ations hate Lcrlt inlr~~•I:u'I•d in
<br />adalrtinp thi: proc•cdnre to iull~l\\ d~.;clrn (lrnal
<br />comPutatiun:.
<br />The r:nnfall-runoT rrlalinmhil~s sL•u\rn Lp
<br />th•= cut'\'c< of ti;•urc A- t to}Il,rnl!!x .\ 1 t\r•rr rJr-
<br />\rlu{,cd Lc Soil Cocscr\':Itiu^ Scrclrc I:\'cirol-
<br />o~l=ts from anal}'<cs nt rautiaii :u:~! n•>la•cticc•
<br />runo!i rcco:c!:; at numcrotts ,i:;;;II :Irrs ox, cri-
<br />n:cnlnl yr:urr:hcds, Tim rr!ation=hip: \\orc
<br />dccelo~ad inr use of cl.aii>• nol:r~•cord!::r rnir.-
<br />f:,ll d:ua. \chich arc n:orc Itlc~::iicl il, th, Unit-
<br />ed S::Itcs th:ut ;u'c rocorfli::;• ra:nfa!1 d.,tn.
<br />D:Ita „~cc! in the f!r\•r•!npmrl:t .:rc . ..... Gu' ,~.;,
<br />or mor•: stm'ms r,ccurrin;; ir, n cllcr.,!:u' li:rr and
<br />nothir.° i. ktto\•rn ::unut :i:sir tilt," ,`..•[:•ib::-
<br />a nC 1'e aLG..< ;},.; f.CCV Oj'n•1! [.:r•:'e o1'C
<br />lions. •^' ~ I ~ t
<br />excluf!i• time ;I. an expLca c:u'c.!,k, ethic!:
<br />mcan~ t'rat ratnfall 1;::cnsit~• is i~nard.
<br />ltain`:.!I intc•nsrtc ;1::f! c:u i.l:iun< , : Into nsi;~'
<br />duru'~~ a <:rn'm ara mn>: im;•.,:'::,Ir, to indi:ili-
<br />t:a! (inor! h.. 1!ro~rn; J: con:n:, t:l;.rot: i,rc:lt: ~r o;
<br />their m:::UOn to re;c^'ion io..:•<. .~ Morn; of
<br />lo\•: in:i ::~:;~: for _: but:r~ :. : c:.u•~ nr;'ii~i"~
<br />rt~rlo,!, t'hr•ri'::; the ~an:c ::rn;.:::,; r.; ra::,i:::'. `...
<br />an nee:' m::~• cau.r ;I 1!.1n:a;;:::;' a„~.li. I: i. !,. -
<br />~nnd ;... <copc of tt•:= tcx::1~ r,i•r•.:<• rl r;ct:::'
<br />rair.i:'..':ct.ntion los, ._..tt:ur ?;.;: :hr
<br />f0!10\`:I:1~ Chal'aC[c1'1=1:C aflOlll~ Uc t'ca:PC:'ne:'i:..
<br />.•~ naun'al \':titer:!tc~l •. only :. ic':: •gr,:u'1 mii~~
<br />of area map con.:,:,: di::'craat t}'pax ut ai~i:,
<br />cuter ::nc! land u::::•r. rach 'r.:n~iu~ a fl.ll~•rrn:
<br />rctrnuun lu:< c::p:a~ilitc. \',"hr ^ cunanalnx
<br />rur.o!i' iron: ~ sere^.1lc aa'r:, :.crr.:;•r rrtl•ct:~~::
<br />to=< relanon<hip; to rainfall :u'r c<timntrll al:r.
<br />thine to;.r•s .ubt rac;cd :rum {~crnld: of r:linf.l:!
<br />n'hich arc also srsumcf) t~, I,.• ::c.•ra;•r• u\2r ti:'
<br />\\:ctcrshccl for each r:uni:al lu•rioli. ;\rut;111y.
<br />r:,lnf::il i. ~ciliunt u::lfin'm o\r r a \•:al~~r:halt -~~
<br />some portion: rcccicr rainiali that oxcc•rfi,
<br />their rc<,,i•ctice retv::LU^ i~,-ses, v. bile otl'.c:'
<br />portions co not. .~s indicic;::,l ..•n,.-; rainf:,:!
<br />,.n:o;m:< of cqu:rl curn:ion ir.c",`a=r so dvc: the
<br />likelihood th:a all portions vi :: \`:atcr>hed re-
<br />c~ice rainfall ~rcatcr than rete:aicn !ossc<.
<br />Thus, an indiridu;ll storm h::rjr.~ rainfall i:.
<br />teasit>' lr's that: \c~ter;hed ..cer:._a retetair,:1
<br />los_ ... dr:crm:ncd from ,. 'r.i~F.cr intut:<i[y
<br />storm ,^.' ,• cat:;e rcno:7 het::u-e ni :un:e po:-
<br />:ion.s at t}:v \\at~r;:^cd itacir.;; soil.; v:ah ret~l:•
<br />ticn loss Less than a~'crn;e.
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