|
., clot <:
<br />~'::: e°.,;pined frcm all types oC
<br />-: ;~ `:ccorn:r.cd tha•. nrcbable max-
<br />Ir. ~.:;~,':... .. ..:'c-:: fer ::I' ciul:•t:iens and
<br />li :.: ca< `. ... :. ,r c•.•ct:r from ac•: one :.: pc
<br />'IC: I:.. •'~ . ..,.. . -_ :~... m,...ir.'~ix:'. thu,:dcr-
<br />~n: i> ccr, ::~. w r~~•.,c~ ;`rob..^.ldc ~..ax-
<br />;:n c:; i:.1'i^. •' n•::~r :... : rc of ~0 square
<br />~l," .. ...~i .. c.` t :1vL. iC v, 1,ut ti1C
<br />
<br />,'r l' ;.rr;:~ •,. ~., ... l:r .: :.~. al':abl;: LC Oti;a111Ct1
<br />:~~ r::: >torn: .=.
<br />i^1 .`:„-,ci.;. , .. r„ nn; c,'nrvl.-The prob-
<br />c:ax::r.'.~c: ~'.<• : c, .:.!.ICS rcprc~rnt an cn-
<br />„r•,:..:':, n` .... ......._... ir.+cnsit}'-dunLOr,
<br />:~. e~;:li-lec' .. ...: o:••, !;,ue e. storm onlc.
<br /><ui::~:,liCn _ ..r. ;c s;c:'m tone and ~'aria-
<br />. ,. i, ,`r'I, ... .~, ri~pic; to !c•cation,
<br />.1: ro~~rrc:,o.:.:.,: ~I:ra;ion.
<br />c i P: oi,^ ~.~,- .. ..... ` 'r: $,'orar Cu+dsiue'ra-
<br />
<br />` I.:1 .,,.~ ~`:: .... _; ~t t:: C.`: Cn::cis; Of ;h:~C^
<br />{ 11 L, '. .... . ,..- ;in: ..:cal ar.d t, rr.c di.-
<br />r,I;:r'I: .. .. . If'. : .._ 5..~:..^.l~ pl I'C COIL ::1 2}7^
<br />
<br />. ~,,,n~i: :.• ;:•.• .•' eafuc~ to their Phl's-
<br />,. lip;~rtaincd from a consid-
<br />:Ina o. ... .:' c''~ :~crrp;i r.: c•:>:Inz• ccrtcn2 in
<br />.tilt"I SO L^.C 1:'0:. .".:,:^_ ^.::\:T ll•^ :^O: SLC1'C COI1-
<br />....., c,•'.::' .- ..~<nci:acl'. t•:itn a simi!ar
<br />.: c'i:::iitr:::,..: ,i (~1 c•~I:~:dcrine trn::,nosi-
<br />
<br />` .. iii ..:r!:(•a!~ . . nlCn S'.~r,.., ,^. 1'C bcs~ Si:lli:d
<br />;,r;iu::.. :i ~ nn:? ca:.:,'<o be used in the
<br />;r::;•!: ..,.:'~;'- ,.= to csL::;alc a~Cr::;(c rc-
<br />:inu !o>: ,.:a.c : tai h~drr~:::ph I:q; times.
<br />.~ th^ ,< cl.,•'c <. , . ;hc rr!; tinn t,'cte:ccn max-
<br />ml mrd~::::~~• ; •,:1•:r.::a and the ..^.:oisan•c
<br />.r.•~:.,i ;'',,. il:; ~. ~, vn c:• a:r^~::::~ is cm:enlcrcd.
<br />r f:'.r!": - tilt:; :.rc cE, ctnr ir. dctcrminin;
<br />,•q~:cicr.r~ ..` .. ~t`-.^'~ 1:. cnn•:c::ir;. .:mr,<
<br />;1' r'^ .;u'c i :.tr` rec~l~:;atic,n }:arc no[
<br />rL ;lned s::'~; ;•i r^:!•: :.- ;hc present time t0
<br />'Ac t!l, :r :. .....,:in.c c<tlmnlcs of storm
<br />c r., ". .
<br />trac:•`~:i: :-`:: c~;l<;,lend in the thinl
<br />' i< ~:. "r. ,,:: ;! r ::~. `:tun that the Inca-
<br />'
<br />,( :, ,..,., ,~ v•,;....
<br />,i,•;, ~ ,~li
<br />
<br />i'
<br />". ,. I" ~ ,' ~ ..: .::;hill ;'i•:rn r,,,.~~~...~.
<br />111
<br />•" ll'•' e::v~• of ,'CIICraI•typC
<br />e7
<br />storms, is. limited to re:iors subject to similar
<br />t;:pes of storms and not separated b~' major
<br />om~rnp'r.lc fca!cres. Thunderstorms are more
<br />v:idch' transposed than ~encra!-t::pc storms.
<br />Feca:.:se the period of record for ;.ny partic::'.ar
<br />drair.:roc Laain is tcr.rr:.;!> quite short, the
<br />tsar.sposition of other storms ~~'i;hi:t the s::n:e
<br />homo,enco`JS mctcoroio~ical and o:"G_raphlc
<br />area has file uc!~arl:arc of cembinul~ regional
<br />expcnc^^e o.` a lark r.•Jmbcr of s;nrms.
<br />(d) Gnurall_cd Prrriprta;io„ CLnrfs.-.?r.
<br />c.^.~inc•cr e~cour.'~rin~ a deg:~~ P.ood es;imat-
<br />ir.c prob!cm needs information rc~:.rr.in~
<br />storm potential. Si::cc scch Informatloa pcr-
<br />tair.s to m°;':11tlipC5 0` storms which ccuid oc-
<br />c;:r from a morE sc:cre combination otmc-
<br />teorolo~ica] c•.ents that has }•et ucen o'osened,
<br />the engineer c::^no: make his c~tim;ac r.nc•r:!::
<br />from rCCO: dCt: StO."In G9: a. 1t 1`; 1::1J, •;='+: i,!n !n
<br />shmr a!! ;!lc rc;inemcnts and r,:ria;io:^.~ t!:a;
<br />CaR :n°'JC^CC ;!1 i' m.^.:'11 ;udC' O: C2F:=C ?10: .^.`
<br />aIUC~ for Cli :il d:ClGCa! loca L:OC~ ., n:l'. .~1C
<br />Lui[ed S;arcs on a ~encralizcd char;. iinv:-
<br />et'cr, broad ;:rcas do ha•:c• !:kc• storm }:c~ra'i:a.
<br />' ~cncralizcc! c:'lart< h_ •:c been prc;arcd fur :^,~
<br />text to pro'; ide one means of rapidl,' dctcrmu;-
<br />in~ do>i~n storm ra;ues for :,nr sprci~ic :u'e::.
<br />Tile dcsi;;n storm ralucs obtained from thc• ~en-
<br />eraliteci cllarts represent a rea<.onab?e upt,er
<br />Lmit and in most cases ',:iil exceed the ~aucs
<br />obtained for a specific u'atcrshcd be n r.ctai!r
<br />in'c!romctcerolo_irl swc!r. If such a s;udr
<br />is desired bucause of the ir,•:portancc or size of
<br />file protect. t!:e scr~'ices of a consuitir.o h>'dru-
<br />meteorolc~ci<: should Ue secured.
<br />(1) Gcurrcli_~d circrt (•, r' thr L'mfru Stntr.:
<br />east o/ TOS' n:cririiau.-Fi;;urc ]5 s^o~~s prcb-
<br />ablc maximum G-horn' prcclpitatiml •; a!:~•< fer
<br />]0-squ;lrc-mile ::rcas o: the Lnitcd S;~:cs cast
<br />e; t1:e lOS` mcrldiar.. This chart is b::,cd on
<br />one presentee! in Il.:drornctcurolo~::ni T:cport
<br />Xo. vv, preparccl b>' :hc Ilcc!romctcorc!opical
<br />l;ranc! of :}:c \a;ionnl \1'catilcr Scn':ce m coi-
<br />I;,boral:on ~,;;h the L.S. Corp: of :: ~i::ccr:
<br />Iscc bible^raph}-, sec. GO). Tir_«~.. G-ho::r
<br />~'al:lcs for ]li-"luarc-:^.ilc a•'r~> cnn Lc mwi-
<br />ilirc! for der::ur1:• In r-~cc<: of G horns and f.,r
<br />l:u;•rr area. u;, 10 7.Ut'0 s`I;I;uv r.::!~s by tirC of
<br />6; t: n• ]f,. .,`:u c,lrt,ai„^ is asscn•.c bNu'r~.•r,
<br />p,~i nt antl ]G-~,uarc-mile precipiu:;wr.. Fur
<br />
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