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tfl-? Q:L) J
f.ir- Ê" Ð. I'iarr
Chi-- ifurglneet
l'¡'ate¡ lExrestl.gatåous 3ra¡rcb
Ëydrelogy Êtud5r sf ÊÃlssfûB Creek BaÊln($outh Eart K¿kncan ltrlgetloa $lstrtcÈ)
H. I. B¡r¡rt€r, Ch!.efEt¡rdrelogy tåvåslou
}4areb 9th 7r
G25Õ957
FurÈber fo nemp dated Jånr¡¡rï 20th, 1971,, sad ¿fter dtecusslo{À slth Èfr.iiðÊgrlen, runsff €6t1!Êstes hve Þeea rgvtseé slightly Èo &åfçe sfËh sub-bastn ¿reås êellaeatad eÊ Ðrå¡rl.ag l*o. c+56f-34. These åE€aÊ sre sll,gbtlydlËfereæt frca Èt¡see oË1g1.ûå11y used fer r+¡noff estlüê¡es glverr fn Îable1 of nemo dated January 2üùh, t9?1.
?rtt¿ched qre ßâbulated nmeff eatl¡Estes besed on net Steac, calcr¡latísnsrl'eets aad the Læbly treek tunoff-et€rratloü rê1åtioasblp used t€ estl&etecuaoff f6r the lÉÍss1on Creek E$b-b*slns súleh tre p¡{t of the Ssuth'Easti{elssna Irrågatlon Ðistrf et EyBÈ€É.
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HaÈer Iavestfgatlc¡¡s Braneh
F" g. Rsksten, llydraul,lc EngLneerHydrology Ðlvisi.qp
January 2teh 71
E':!5ë95V
Revles êf Ë*ter Snpply ead Investigatfoas SlvfslEuiåydnology Study of Hlssles Sreeb B¡sl.u(South Ea*t Ketr-s¡ns Lrrigetioa gåstrict)
À report prepated by the l{ater Suppl¡r a*d InvestlgeÈions }ivlslon to deter-nine Èha Rcter yleld of, Crayon and E¡draulle Greeh dreinage beslns {trt-btntarJr to $l$slGË CreeLS r*s rernl€rêd aÊ Ehe requcst of l€r" B" E" Harr,Chief Snglneer, {frter lcre*tl.g*tlont Br¿ach.
Tl¡e ssthod lrsed by the l€s.ten Supply encl tr¡rvesÈtgetfeaõ Ðlvtslo¡¡ tc ebtefnÈhe treter yield for ç*r1sue cub*h*cins lu the ÞfEslçn Çreek bgsip fs ssfsllsws ¡
1" ÈlcCulloe}¿ (42ûÊr), Postfll teks (45(}üt) and ElEslon Creela (¿+C*t) Aprlllst s¡r€s F¿¡teï cqtaivslents âtre pletted ageiu+t elevation {Ffg" 1}.
F¡au this gragh tË 1s assræd th¿t in tl¡e Htssion Creek basln, HcCulLectrÂprll lst s*ory watêr equ{valeat. lüdlcates ¡ginter precfpltatlon in the*¡ea beÈween 4ü{3tl and 550€r elevaÈioa, end Hlssi{¡q Greeh /iprll lstÊaæ ìrater equlv*lent Eh*t tn Èhe area bet¡*e¿a 55û{ir eË# ?98*t el.eva*ti.cn* Festlll Leke date le deleted"
:" 1949-64 streeoflor¡ det* aÈ ÐB!¡Ê¡-116 E{ssloû Grpek near EasÈ Kelesnaere edjusted for dl.yerslen and sterage {1ü Lo 25% of recorded ilprf.l-Augeet runsff ) to oüt{lrl.Âpril-åugust r¿atüËal runoff , Incbes sf run-off sver tbe 323 squ¡ùre atle bæl:r åre cãpËted to yield o æean of7"33 inchee.
3" ÞfçCu!.l,och *nd ÈÍl,sslor¡ ereek itprl.l. lgt snor¡ tf,lter equfvsleat ls vefghtedby area;
ÞåcCullocb ¡q : È4cCulloch x .7L?
t{lssion tr. g @ût arld ?l'üGt =. Fflssi'*ïr sr. x Û.2sËares ebsve 4$Ûiit
Tke sr¡¡n .:f these yields aÊ lndcx ef total rrlster precipitatíos for thebask¡ fos each yeer"
-/-È
& " ; adding d".pri1-eu6u6t preclpltaÈion at Êfc0ulloeh to the winter pte-+ípltaËfcn íadex det,e¡mined lçr lteo 3, an annr¡al preeipiÈatlsn index{s obtal$ed.
5. TÈ¡e ratto q!!qr¡å.1-æg.lqlÈÉlBilg1-ågd3å = fêcÈor ls c¡lcuLaÈed for eaebÂ,prtl-Âugust runeff
year Ln Èhe l9¿r9-å4 petåed of dlsslan tre¿k streæf,lcw date.
These factors vary frcm &.24 to 0.48 wl,th a ntean øf 0.36.
6" For eny sub-basl.n fn Èbe Þflsalos ercek besin, thç æÈnlnlu, nean, aadru,Bxisr¡Ë arrnual precipiÈetlon lndetr ean be pbÈalned by the fotuul*;
Ê1 Cqg Ðq9l * MçCulloeh Aprlt lst snow lrat,erffiot"- A equfvalent
,, Þlleåfon Gr. Åpt1l lst snold rrater^ equl.velenÈ
'i- licCu}Loch r\prll.-/rugust preclgitaÈf rm,
¡jslr¡g mlnLmue, mcgn and oaxip¡m snent uatêr eq.r{valenÈ* and preetp!.ta-tlo¡r values, arrd multlplylng by the dlnlnun, ûeåa and aaxlm,üü fectar,mlnimwn, negrr and çea¡imrs runof,f fu eny sub-basln is cbtafned.
thus, thfs aethod esÈloatês aa aãnü41 prec{plÈatlon lnder by us{ag Bncr-eeurâs and meteoreleglcal d¿te above 4S$0t (wberç uain pa.rÈ of runoff eri-glncÈesi and relatss thls És Þllselon Creek ruuoff by a faetor" The mlnluum,nean and mxfurm vslues of thts fact€r are used Læ cotrJunctforr r+l.th ninlæue,seen å¡rd s¡årtærn prectptÈation vêluee welgbBed by arer to abtef¡'¡ runEffestimabes for v¿rlous sub-baeins trn the Hlsclsn C¡eek b*stn.
the defic{eneies la thla rethod are t6 tollowe:
1. Ðlvl.ding tbe b¡stn fnÈo a 4tùû-55$dil aad e 55tG-70tltlt bend Lgnores thelar large variatioa 1n the verÈ1€41 dlstrlbutien sf preclpltaÈton and run-
off r¡tth1n Èheae 1500r b4nds. Gbvf,ously, this lqfluences Èhe runsf,fest,fnaÈes fer sÊi¡ll sub-b¡elns esrG Èhan for lar6e snes*
2, Th¿ ¡¡eakness lo usÍng.åpril. lsÊ snorr çatqr equlvalent dato te obtalnthe preelpLtaÈ1on lndex ia polnted st¡t tn rTbe Dlstrlþutisn of Annual.Sreelpitatlon ln the üLanagen HaÈershed and Vielnltyr+ by È4, 8. Denard.the avesage alatly Èanperature belon $hfcb no sppïcclable ablatlen ofthe snor*pcek sccurs ls about 25cF. The neaa dally tæpereture ls beloe?5oF froa l{oveol¡er lsth tc i-å¡reb L2th et ÞIc€ulloch (+Z*Ct¡. Furttrerothe pertod durtng whlch the teaperåËure is betw 25Gg ls a fr¡rietloa efhetght, Thus, aÈ 4ûûûl the peri,od ls l:trotreóer 23rd t.o Ì4ereb õth, at5üGüt " Noveæber 12tk Ëo ¡15¡rrch Z'Gth ead et, 6${J{ir, ÈÈoyeæber 6th to AprillsÈ" S¡re t¡culd, tbus, use i{areh lsÈ snolr nåter equlvalent for 4{i{Jtlend 5iX;üt and ÅBrll. Lst sno¡¡ Ìdatêr egulvtlent fçr 690úl " IÊ later dateeare ¡rsed,o apprectrable sblatlon wlll bave ocesrred.
"3
?-
7 edtlfrig êprll-åugust prectplËåÈicÈ atcd.pitatien index determiaed ln ttæ 3,is obtelned,
È{etullocb to the eLnter pre-ca ennutl. greclplüaÈf.m iedex
5, the r¡tle - fsctsr is c¿lcrlated fæ e*chÅprl,l*åuguse flmsff
yaar {n the 1949*64 pertod of $1s¿lon Greeh atrc¡mflonr dåta"
These fEc¿ota very frm 0.å4 to t"4ê wltb I Eeåü ef Ð.36,
6" For any sub-bêsfn is the Hl.asl,on Creek heein, tbe n1¡{srs, roeüa, tndç¡¡{s¡s ¡mr¡¡¿l praclpttatfs* fader can ba obteined by tbe foræul*:
a Htssloa Cr. apsLl lcÊ snür Patêr- rqul,valent
+ Ìãe$ulloch Åprl l-Augüe,t. preefpttatlm
dlsln6 nfnlnrru, ee¿n and sarfu¡m ancñr s*Ê€r equivele¡tÈe anè prsclp{ta-tlon valuesn and aul"ÈtBlytftg by ths n{*{aqs, seô& a¡rd na*lqrn f*etor,ni.alærn, n,EìBI¡ ¿nd s¿xlan¡¡r ruaoff, f.n eay sub-bcsln fs obÈ*fu+d.
Ttrus" thls nethEd esàima8es an annu¡l preclpltatfon lndex by ue{ng sÉsecor¡rseand acteorologleal d¿ta aborre 4gû0f dshere És,lt¡ pcrt oÊ runoff orlglr¡stèsia$d relateÉ thls to ÈSlssion Creek runoff by e fcetor" the pl¡rf¡¡rs, eeen andEtaxf'mtm valuêË sÊ thi* f,aetor ata us+d fn eonlunctlos ¡¡tth nlaLstæ, ncaa erndeâ¡ßfffi$ preefp{Ènt{oa çBlueø nelghted by sËea to sbteln rtrnoff esttrìeEtes forverlocs çub-heslns ln the li:lselsn Crcek b¿el,n.
fhe daffcler¡cics fn Èh{e ÊeËbod åË€ ås fEllowe r
Ðlvldfog tbe bssi¡¡ Lnto a ¿¿Ët0-ssdÉt rad a 55û0-7ÐSGr bend ignonee thelarge nasåsËlerr ln tbe vsrBicâl dlsÈrfbëtlon of preelpltrtlon s¡rd rs,G-oÉf çlthln Èf¡ese lsûgl bå*ds, Gbvfousl.y, thle fu¡fluenceÊ thê ¡r¡qoff¿s¡{aaÈeg fo¡ sffill sr¡b*b*slüs Ðûre ührn f,ur Large orreg.
The rsakness ln uelng Áprll lgÈ sssç wtÈsr equlvelenË data to obt¿lÐthe precipltaÈf.o* fndox la polated otrt ln ìlfhe SisÈ¡fbuttron sf, ånar¡alFreciplÈ*Èlon ln the Qkanegsn S¡tershed cad Vicinft¡rrt by Þ. E, Eanêré.Tbe everÊge datly teßFÊroture belsr tùteh B€ Êp$re€table sbtrsÈlc'B ofrbe snowpeek oecurs is *bct¡t 25vF" Elre æen daiLy tæpetature ls belo¡¡25oF fræ Hov-cúer l.9th te H¡tch 12th et H¿Culloeb {430Ot¡, Furtbar,Èlre perfod durlng ¡rh!.ch Ehe temper*tur€ 1s beltr 359F ¡.s ¿ f,crßFt{.on efhetght" Thus, åÈ 40ûgr Èhe S€ãlod ls Hevenãber ?3¡d ts UarÊh 6th, et5$0$f , Novernber 12th tô Htrch ?Geh an,it sÊ 6ggßf , l,iovenber 6¿h to Agrll!.sË,- &rs eould, Èhuer uee tfateh le¡ sn6s rrsÈsr aqtrfvalenÈ f,or 4ûttt¿r¡d SÐOGI errd Âprll ¡.Ét sr¡€E* !ùStår equ{v*lent foe 6ËStt, If later d¡tessre r¡sed, agp,reel¿ble eblaEian w¡ll bar¡e oeeurred"
1,
3-
tuÊ, {rsi{¡g. Aprtl êo åugust p:rêelptåfr*ion sad ¿1prtL 1sÈ srrccr sêteË equå-rnleng¡t $lc$¡¡tloeh end t€i,selon 4loek to e¿lcEl*t.e thè *an¡æl greelptr-t*tier¡ Ln*exr
{s} lg*ores $*pteder-0etobesdep,eadlng oa elev*tlont
cr Septeaber-Sg¡¡*úer prec$,pltaÈåsÊ,
{b} tnclr¡.ds-g tb}¿tierÈ sf the atæpack *t 4?SÛtåpril L¡t sriw EBtGr tqgivalent et !ff'sslûEr¿f¿h Сn¿rdts d¿&a).
sface Èã¿rch 6tb, (ushgcreek (60Êtt) âgr6ëE
The precåplt*tlou fndex could b'e la¡rrovod Þy using ütrch lst acsrü n*ter*çrlr*lent st f&eirltrcch snd alee by êÉtin¡*tl,r*S mo+thly precåpt Èatlor¡ forthe partod o$tsl.dÉ the eätrS¿Ek gcctær¡latlsn {rc4*sø19) perfod. D*n¿rddtd Èbte bys
{a} êet€*Etnflqg Èbe ËaÈå€ of sctesrologJ,cal st¿t{æ {*t lsrer aa€ fntêl-medlctc slerreÊf.€Bs) øomtbly preei.pttaÈlon ts *nnusl, precfpltatÍon¿ad assrßl.ag llnear varl¡tien våth bel.ght, Rstfcs ÐGre th€:B dttår-sl,æed f,er Êhs &,oa-eêlt pcrfod vtth respeeÈ ño thc armr¡al egtel ták-fng tnto eonelderetÍ.on altigude"
{bi decenstnl.ng Eeån Ê.r-mri*l sûon souree precË.piÈÉÈlori by d{vådl.ng eaeben€Ër eotÊrserg egtlffêted nor¡-selt preelp,lÈstlon by tha ratlo derivedin (s).
lhe¡o dofielerrc,åes rev+el thæsclsee fu SFre resrrlÈÊ oþtsårÌgd 1rè thtp rÉppra'The ssst, obvlore errtaely lr ree¡¡ ån +enmpartng the rtrnoff e¡tf@te fsr ftif.sslenCreeh b*sin ¿L¡one L3Ðtr (?.3¡ lnches) snd the ruc+ff eatleete of, 7.1û lschesÉor ttr¡e hlgh etevettsn (*b<rrie 4G$Sf ) *rõ& ßsntrlbutlag to ÈÞe resstro{rs(Area t ). Tl¡e mcsa elev*Èloes sf Eiesloa er+ek ebove t3t0t end *{reE 1 êre45ûûr *nd r+9ûür reÊp¿etå$ely, ?t* ¡re* þelæ 35$ût ln Èhe Ok*n*gea b*slols generally eonslder-ed to eærttibute vcry tittl,e to strrf,oçs masff,' Lf,thle Ss È6uê, the rsnsff ln êre¿ I ebe¡¡ld be gre*.ter tbån 7'33 f.nehee"
Anether år¡ffiÊly 1e La Èh tes fcr tOn¡ron Sreeh beto¡¡ -Fooley,Creek dlverefsã ßre* 2) treeå{ belou ãydr*ulå* Ðam (¡tre¡ 3}.In tÞ+ Hater Supply gnd &¡ne¡ttgÊtloraÊ Dlvislea rëporÈ tht¡ ere alæsÊêquel å.8 6.¡.3 std 6"05 å*"tesp'ectlvely. Iuspectlao of the tr€*-elclratf€rigr*gbs (Fig, 2) fer Èbat portLøn +Í a¡cb b'aafi¡ sb€rpê 3ggÐt teÌ¡€81n thåtá*eh þ¿aln hao spgroxfueeÈê¡.y Ëbc tme portåen of l,ts area lytag be¿ween4Sû0 and 55tQr, 3uÈ, of tbls rreao alæost all qf ËhÈ Hydüeullc Creek b¡s*1n {ne*n elstretfon 4I€0f} {s beÈ$eec 4Ë0Ë sûd 4é8tt, ehtLo nost of, theC*nyae C¡c*slc baeir¡ {npea elevetlça 458üf } te bÊ-tseån 45t0 cnd 55S0r. Thus*thê tånïüR Creek b*sln sbor¡l.d bepe * *l6nåflcrutly b:lghel runoff tþ¡t Êy-drer¡lf¿ Creek" BecðËõe * 4ûûû.55001 bânrd fs c+A*ldsred ¡o hev¿ the sÉglüpraelpit*t,l.s,n Èn tbe HeÈsr $uppty tnd In¡rest¿g¡ÈÈm$ Ðlr¡islsn rêStrfÈ, thisdet¿.il does aot sbcrtr trp fut the rT¡aof,f eËt¿88ÈêÉ*
lis I e€øpårisonn êhe runcf,f-elsvetloa *el*tXouahlp 4eriv¿d for Èhe Ldlyt?eek b*sÈr¿ (ffg- 3) rrâE used tc cþtqirå qÊa$ Apríl-July runoff €stÛDÊùes ftreub-baslas Etlrd{Êd fn tbe Ë¡Èer Supptry esrd IavesËtgftåous Ëlvls{otÈ reporÈ(teUte li" The rçaoff-elevstioa reletåonehlp {s baaed qt 1966-7t eËr€ås-
+
4 fl-
ÊIr tat¿ oær lanbly treek aad {ta htgb elevatts$ trlbutary Tertaee Creek.ÍÈ rs assraed Ëh¿E thsre is ne runoËf eqntrf,bution belcte 3Û0Sf " ths relE-Íioasblp iÊs Êrteased ln fl sÈr*tghÈ llse to 71ÛGt frs the æaxf"æ¡a eleva-tlsrr of 6t$ûr ln Èhe 3,anbly Oreek b¿sÌlu. Al,tbougb l."smbty freeh baeln lssß Êhe west slope of the Skenegan Y*lley and ehout 1/3 tÉùe are¿ of SfetfonCreek basin, tË ltes rotegbty st, the s¡øe l¡tltude end Èþe reaa elevatioræåËs seåEly Ëhe sæe fsr Èhe atea gboye 3ûgüf , þl€ån elevatio¡is are 4500rËer Íæùly Êqd 456tif fer Klssion Greek"
Tbås rrrnofË-elevaÈ1sr¿ relaÈionshfp eaa be ecnpared ltith dêêÊ Éor tbe Ðk*-rì*gas beef.n obt¡lsed by À, Pfpee la an uapsblfsfued raporS trÀ*alyses fpr r¡s*Ëetl{e*agænt 1n Èhe Okan*gen V*lleyrr. These ere È¿butåted bcls¡t tad plottedl*r Flg" 3:
Ëlctr" (r 10Ê0t) ¡.5*4.0 f+.S-4"5 lÈ,5-5"9 5'S-5,5 5,5-6.S 6.Û-6,5
Annr¡sl ourf*eerunof,f (fn.)
G,l, 9.2. 13.8 äç.8
åltliough A. Flpesr da3¡t yíeld a esraÊ eglrÊ€rlr¡¡tive trgroff esÈi8êÈet theycaarffun Èhe el.ope of the reletlonehlp, and *ceordfng te !>ipeÉr MlerlonÇrreaL b¡sÈn eontrl.butes Ê håghes th¿n ülèr¡ge ¡EOt¡Êt tc Okanagna l¡esf.ns.easenel ãunoff.
Eattn¿tes of airrinun ÀpriL-Jul.y ruaoff are s¿de by two wthods. ùne ts byassrnf.lg th*t mfnfmun ruaoff is 47,ür" of the aean, the saùe as for ÈotElüet nÍÈur*l lnflo,c cf Brfbstary stre¡Ef la tbe Okanegaa basín, These d¿taåre eoaputsd fran teble 4 and 5 pf lrOken¿gan Bastn Inflot* Ðetermfsåtlsnsrtby T" A" J, Le&cb. Ånether estlsnate of slnlnup rr¡noff ís obttined by assr.m-lng tb*t it fs 29,62 of the Eë¡n" ?his fs based on ükanagsn L¿ke HlsÈorl-cal !{et 1llflos datc eæplled by /i, Ff.pes ln ÌrAnalyeec for l,i¿tcr llanagcuentio the Gklnsgan Volleyrr (unp*¡bllsbed)" ?hls estLasÈe Ê¿l¡ be nore valld rybencsûslderfag ¡rótcr avsllablç fsr reeervolr stotage 8c net inflour data lncludethe effact of evaportttroa frqn the ressrvolr sutface, Lrut previous studlesindlc¿te that the¡e f.e less vati.atlon in runoff et hlgher elevall.ons. Thete.forê, ßhe sLnlffim et 4n' sf tbe r4ÊÉlrl EaJt be sÐra valld"
It ebould be neted rben eæparlng deËs ln t¿bÏe I thåt the Ìtydrology Dlvl-sion estigat*s a¡e for the åprtl.-July ¡nrlod shtle tbe ï{Eter Supply ¡nd In-veËtigåtåçns Þlvtsfon er'tiina{es..rereårfuþr^i I '* Au4øS'ú pertod. Írlthough fotsltghfLy dtfferent perfoda, tÀre Ëigures should be cæparable as August run-off ls s ?èay sosll gortlen of Apt{l-.Iuly ruaoff.
IÈ can be ceen ln l¿bte I that th€ eÊtrmËes uslng the Lanbly Greek rwioff,-eleeatlsn relstisnsblp (FfC.3) reflect the vsrl,¿tisn sf runoff wlth elev*-tloa for Èhe spaller sub-baeins, especlally beteeen åres 2 and ¿Ir,ea 3. IÈ¿lso reEulte in a btgher estlmate of runeff {r¡ ¡lrea I than for the }IlssloaCreok baetr above 3üS{¡r rlhteh agreeg rtth tbe differaaee Ln mean elevaÈfsnsfor Èhase tÍro åress.
2"7 4.ú
,5-
SÈr ¡ftron data h¿ve been obt¿lned on Tertece ereek, e hlgh elevaÈion (47ûÛ-57tr¡') ¿rlbur¡ry to r.aù1ï tareek, for tl¡e perlod 1966-78. lhe +earr Åprl1-July rnnoff, for tbls perlod, t*hiehr-eceordfng ts tþnegag-Lake. net luf loedåtå, gives å gcod tsäicatié¿ of ¿-long-tåra-EùÊari, :ts 9.66 inchss* lcs themes¡ eieratfo:¡ of thls g*uged sub-b¿*in ls 49tür, etrlle that sf Àres 1 le4960t, ehe runeff shoÉld be aboxt êqtr¿l or¡ Èhêãe t¡ro hlgh elevgtian ctrb-bgsl.as. Ehe ÈstlÉåtç of lû"jr fu¡ebes fer Âprtl-July rr¡uoff far Árta I lE esn-fltaed by tha cecorded runoff oa the lcrråce Creek st#-basln"
It agpears thet Èhe aÊtç deftelaney {n Èhe Ðeter $upply and Imrestlgat'loasûlvfâ3on Eûtfood is tt¡rt lÈ f,ôllg to åccor¡nt for the larg+ f.nereâse ln rsnoff¡glùh €ls\¡¿tlsa stthle ¡ ansll esb-b¡ela. Ths precipitetien dndex does ust&eeÊuûË f,o¡ fltl. ptectplt*Èlor¡ ¡bl.cb sût go to' prtælng tbs ¡ofl ot to 3ur-ft3le runsff, ner do¡s it *Êeoüût f,or the varlEülsn Ln eno*peck aecuat¡lstlortperlod (days b+lo¡r 25GF) sltã clev*Èisn.
These shorteæl.ngs l,a the preelpltrtfon lndex çtll nqt af,fect estlsEtes ofEÊên rsüeff , buÈ cot¡ld effeet tbe year-to-¡rear varlstf.on of tbc' factote ¡rûrlchare subseqr¡enÈLy used to €ÉÈlnlas *¡ls¡u and minlq¡m runoff v¡lues.
the estts¡tes of sub-bssia ruac'ff r¡olrld be improved b'y taklng krEo âccrrunttbe lin*ar varl¡tl.sn oË grecipltstloa ¿nd runoff, *lth elsvetlon fsr sqËlle¡c€ntour tnÈÊrff{llsr sty 5QSt, Tba prectplteËlon lnde¡ and, consequently,thc y.early fcetor ¡ysuld be iapreved by eonslderl4g ¿bê vErlatlsn of the sn$rr-p¿ck ¡eetæl+Èl.on perlod rlth elevatl.on (¿s eecertatËed by Ðaneré) and byäeneldcring f,all preetpltatisn. Íhts lmprevemeat 1¡r the yearly ftetsrs ¡¡ouldþe rsfleetãd tn an lmproved estrdtÈ+ of ¡¡¿:Lnua and sfnÍ¡m¡n runoff.
Lt sbot¿ld be eophcslzed Èb¡È the liyd¡ology Bfvlsie* ruaoff eaÈisaÈes forHlseioa Greek eub-besins år€ besed on d¡ta for a basfn on the opposlte sldeof th€ Gkanagsn Valley, Al.though uslng Fig" 3 illu¡tratcs the ruooff Èrendwlth Elevatloa, gbe aètu¿l runoff on Hlssfon Creek ¡ub-baaLas nay be dLf-fereet as 3¡rnsif v¿riac not only eler¡¡ti.on, but matry other toPoË,raghlca'lp¿råltôÈer8.
A empreher¡sl.ve hydrologT study ahould n¡ke use of all avaflabLe slfe¡qflotsd¡Ès for streæ ls close proxtolty to thè b¡sin of ,.ateresÈ, end it ls re-cl¡w.nded thaÈ Èhfs be dme for the Hlssl'on Sreek b&slc"
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