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<br />I)D22_6
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<br />5URF..\Cr WATER ~ \IOSTlILY \IE.-\" l>ISUIARGE I" KEY STREA\IS
<br />
<br />Vn,haJed arca ImJl\:ate~ ranlle bctlH"Cn hjghr~l and l<lwe~l It"(;ord for the month. DJ~hed line mdic:ucs median uf monthly \l"alu\>,
<br />fUI Iderenceperiod. 1951 80. IlC.lvy line indiull."> mean forcurrcnl penuLt
<br />
<br />
<br />= """
<br />z
<br />=
<br />~
<br />-
<br />~ ""
<br />~
<br />-
<br />-
<br />~
<br />=
<br />=
<br />~
<br />z
<br />~
<br />-
<br />~
<br />z
<br />~
<br />=
<br />
<br />....IIA!O..OJr......JJ..sO..Olr"....
<br />
<br />198)
<br />
<br />"I<
<br />
<br />,,&5
<br />
<br />
<br />..JJ.so..OJr.....JJ..SO..O r".....
<br />
<br />1981
<br />
<br />"I<
<br />
<br />1985
<br />
<br />:'IIAnf)~AI- W..\HR ('()"UI110~S
<br />..\priI1985
<br />
<br />B.ued un u:pOrl' from th." Canadian
<br />.md U,S. I'khi uilic,.~:comrlcted
<br />~la~' 9, 1%5
<br />
<br />TFnl~K Al
<br />ST..\FJ.
<br />
<br />111"milSG. ROls. Ld'lor
<br />CanoU W,Sdb..le
<br />AlIenSmnulI
<br />John<:. Karnm...,cr
<br />/<.:ri,hnavcm V. Sarma
<br />
<br />cory
<br />PRrPARATIOS
<br />
<br />tone I-leshnlnll
<br />Sh.Hnnl.Peters<>n
<br />Daphne L Chmn
<br />
<br />GRArlllCS
<br />
<br />hanCl~ B DaVl,on
<br />('arnlynL \lo~
<br />Lcsli.. J. Robinwn
<br />JOlin \1 Rubin
<br />
<br />The l\ation;d Wat", Conditio", IS rubli~hed m"nthl~ Sub-
<br />lIo(:riptlon' ;lrl." free 011 ~I'plication to the ~dtional WJter Condi-
<br />tions. l'_S, C.eol~t,'al Sut\l'~.!.IS'; ]9. Reston. \'ir!:.inia 22092_
<br />
<br />L\PL4.!\,4. TlO\' 0] 0,\ T.4.
<br />
<br />CQH" map <hm.'~ generaliH'd l';!lIern 01 .!rea-mll"" for the
<br />month ba,ed on ]11 indc\ stream~:lj:lnj:. 'l.lliom III ClIna,h and
<br />]64 inde' ,ulions in the l'nitcdState. AI3.,"aa.ndll.l"'a.iiin~1
<br />m~p. shnw sUC'amOo" onl} at the ind,'\ ~aj:.ifl!! ,taliom thaI ale
<br />kKatl'd n~'it thc points shown by Ihe a.no"s.
<br />SU\'am~lo"" for the cunelll month ~comrared ....ith 11(1.... for
<br />the S.lme m<'Illh In the JO-)"e;u reference pt'tind. 1951_80_
<br />Stre.amllo.... is consldl.'red 10 Ix below tire nOFmi1/ nJ1lJ[t IIIl is
<br />wnhln the range of th~' 10.... ll{lw< that h.aw o..-curred 2.5 pcl.ent
<br />of th~' lime (b.do.... the lower qu.anilel durin~ th~' referen.;e
<br />p.:n<>d, 110.... i, .:unsidclN 10 bc4h<lI'e the nomu;/ 'tlflgt' If It is
<br />"ilhin the IJn~e "f the high Ilow~ lh.:1.\ h;!"e occurred 2.5 pcn.'ent
<br />of the lime labo~e the urper quartile). Shorh'r rderence pen,}d"
<br />are u~" for the Puet10 Rko index slations be<:au>c of the
<br />limltt"dr",nrd~ a\;]jJable
<br />
<br />
<br />1l...JJ.SO..OJ,.....JJ...sOOlDJrll...
<br />
<br />198]
<br />
<br />1984
<br />
<br />19&5
<br />
<br />
<br />1l...JJ.SONOJ'.....JJ...so..OJr.....
<br />
<br />1983
<br />
<br />1984
<br />
<br />1985
<br />
<br />Fit,.... hi~h,,1 than Ih,' 1".....'1 'luarlik but I"...er Ihan Ihe urrcr
<br />quartile Ili d"S<:f1bed J' ""1Il~ ...ilhm tire "'''''141 ranf{c In the
<br />~all"nJ.1 Walel ('nndllwm. the RledlJn is ot>lamcd l>y lanking.
<br />Ih... )0 n<nn fOf e;Kh munlh of lh" rd.',,'n"e rem,d in Iheir
<br />ofder 01 mag.nlluJc. lhe highe~t n",. is numb"1 I. Ihe 10we~1
<br />tlo.... IS "umber 30. Jnd the a~erJ~e of lh,' ] 51h and 16th hl~he'l
<br />!lows is Ihemedian_ Ollo:--halfolth.,tIRlCYOU\,iQu]JC\p..'\.'llhc
<br />11......, fm the month to IJ.ebclo",thcm"Jianandone-halfoflhc
<br />lime to b..-abo\'1." tht"mediJ.n.
<br />r'lood fr<,quellq Jllal)"~es deline the ldation of nood r<:ak
<br />mJ.!(nilud" 10 plobal>ihly of occunence or recuu...nee inten-al.
<br />l'robabJlity of O\.'.:urrcn.;c i5 tho: .:hillln' that a !'iWIl 1100d
<br />1l1~l'lItu.k ...ill "" e.\,'e...dl'd III an~' ulle ~'car. Rel'urrencc inl,'rval
<br />is the recIl-'tonl of probabilily of occurrl'llce and is the 4l"tragc
<br />number of y'ean hetw"cn orCUrr('nCl'~ I'o! e.\.lmple, J nood
<br />ha';n!; i probability of on'unenee of c).O] (I p..r....ntl hJ~ a
<br />re.urren...e intef\'d.! of 100 yeal1i. Recurren,'''' mtef\'alslmp]}' no
<br />regularit~. of (>ceurrencl'; a 100.Y..3r llo<>d might t>c c\,'c"",,,...d In
<br />con>cculi~e year\ III il mij:hl not bo.' ,,:\(Ccwed in a IOO-veal
<br />penod_
<br />Slalcmcnllabo.'utgrflu"d-....a/..,I......ls Ie fer to.ondill"ll! n..al
<br />lhe end ulthe mnnth The ...alel kvel in ca<.-h ley oh<.cf\~lion
<br />......111_, compared ...ilha\'er3j.!elc..d fur Ihe .'nd of lhe month
<br />determmcd from the ""lLre past re':Old fOf thaI ....ell 01 from a
<br />30.~.car rdelcn.:t" p..'nud. 1<.l51-!W. Olilng..s In xTOllnd-....alcr
<br />IneIJ. unless dC:'-'.'llt>cd olhcr...;se. uc fNm Ihc end Ollhe
<br />rle.iou\ month to Ihe cnd of the curren I month.
<br />Di'!llOln'd solids 3nd lemperatule data for Arrll are ~iVl'n lnr
<br />_Ii" slrea.m~ml'hn~ sit"s Ihat .arc part <>f lhl." \'ational StreJm
<br />Qualit} Accountin!t ~el"""lk \~ASQA~I, Di."olved solids arc
<br />mlllcrat~ di",-,hed in ....3tel Jnd u~uaU~ "'oll~i~l predominantl)' of
<br />!il....a and lon~ of caldum. magncslUm. sodium. ruta.-.sium.
<br />catb(lnatl.". bkOlrbon;!le, ~ulfatc. chloudc. and nitTJtc. D~.\OI\,,'d.
<br />solidI dis.:harge lepte~enu Ihe total ,bil}' ~mount o( dh.'olwd
<br />milk'lili caent"<! b~ th" ,trcam. Dil\oh.cd-wHds COllanrrations
<br />arc jtellcrall) hi~hcl dutin~ I'<"riods 01 I"" sheamtlu,,". bUI lhe
<br />highlC'Sl dhs"hed-<,'hds JlSchdf)(t'S IK.:ur dunn..: periods 01 h4:h
<br />streamllo.... hecame thc loul 4uanlitiM of ....aler. JnJ therdllle
<br />total load 01 di,\<'hcd mlll"rab. are!ot\ mu.h gre;!lel th~n at 111"11"
<br />0110... flo...
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