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<br />42. <br /> <br /> <br />0018:53 <br /> <br />Direct runoff me allurements. <br /> <br />The. useofdirec t l'utloffmeasul'emen-ts in-e stimating wa te I' <br /> <br />supply sh<;>uld beenc-ouraged. For most.places.it'is.easier and prob- <br /> <br />~blymore..accurate..toestimaterunoff-andobtain its frequency of <br /> <br />. -occurPenceby"co'rrelationwibh.knownrunoffmeasu.rements than to <br /> <br />. . make the preciicUQnon the .basis.-of .precipitati-on i.~ency . 'The <br /> <br />. <br /> <br />nat.ural .variabi U ty in rll1'lofffr-omsmaUstockpon~waters.heds is <br /> <br />il1u"'tl'~ted. by t~el'ec~l"ds.ior 2.5s,:chba-eins in the upper Gheyenlle <br />.. . Riverba&i'l'l,.(table Z).' . Thel!/el'~Gol'd&shGw .that..if4 a€'l.'e't'feet of <br /> <br />. . <br />" ' . <br />, . , ;... ,... i" _ . __. .' _... ". <br />l'U1'loff-i s. .n~deci.:.tQ' meet the .annual.needsan<!ll-osses, then al,most <br /> <br /> <br />half~ftheptl>ad&;have 2..:or mbredryyearsia-4,butiionly 1 acre- <br /> <br /> <br />fGet is'need~d,bofthe.~'ds.wc;iuldha've'beendry for l.ye~r'and <br /> <br /> <br />3 .for 2.:. y""j!..rs or'1Tl;El'l'e .'..A.gen..e.ral-reg.i_ldi-st.ribu:ti<;>n:';f annua.l <br />" ,I"; . <br /> <br />runfllff lnWestern Un:itE\4.StatellC..is..gi.vetl in ..the:8elect.Committee on <br /> <br />. <br /> <br />Nat'QralWater~esGUrces; United. State II Senate RepQrtNb . 13 .( 1960). <br />Fletcher.and '. Rich.(19$..S.).han-.elas.sHied..wateuheds in.Mi~na, New <br /> <br />, <br />..Mexie-o,. an<i--nerthweste~n Te,.a.. .as-a.r-eas...of .bi.-gh, mode1'ate, and <br /> <br />.lo.w yietd.......~mewh~tmorEidetaJledmap&ongeo-me-tric me~n <br /> <br />, ' - '- . <br />.anl'lou~\ .r,ul\off...an<ilyea.r~t~year"'ariati<;>n.in-l'unGH.al'e'cofl,~ ned in <br /> <br />u .S:Gel'ps:Gf-il...g~nee'j,.sr-epOrt( 1953). 'These-c-harts-gi~ runoff as <br /> <br />. ....it.:Occu.l's.frGm:tath,:er.!ar.ge-.a.r-ea,.s. . FOl':c<;>mpa.ris<)n-it:sh_oul(f be <br /> <br />. .._ted..t~at the stlidi-es. in tlle'l1pper GheyenneRive.l'.ba.siniftdiG ated <br /> <br />generally greatell' unit, runoff fro;m smaH areas than from large. Oth~r <br /> <br />.-.,,-""" <br />