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<br />20
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<br />001841
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<br />tlte--ck-a'l'ac,teris-ti-cs of -the, storms. Thus-, - r.ains of O. 5 inch or less
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<br />seldom pr-a.mee rlH10~f exc,ept when the int-ensities a,re very; high or
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<br />soils inthedrain<lgebasin,are uncommc:nly-tight.- When:soilsare
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<br />sil-ndy, rains ,Gf a,n inqhGrgl'ea,ter may be requi!,ed to produce any
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<br />. :"' i '
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<br />runoff. By decreasin~ ,soilpermeaGility through-varioli-s ~ethods
<br />of t,rElatment. increased runoff may be-obtained.~ bo-thlarge:t'
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<br />-al'ld&ma.-Uel" stprms. Theol'etically. if the surfac-e is' rendered
<br />I
<br />i
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<br />. . , ' '
<br />,<;(ompletely imll>erv.i,o"s, the runoff shoul-dapPl'ea.~hthe total,.
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<br />amount.oJ the 'rai,nfall,butin-pr3octkethis-is"impl:>s ~ible to attain.
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<br />'robe sucees-s-ful" -any-tr,eated,area mli-styield'suffi~ient
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<br />water for the liveStock ne~ds.-,AJ3-SlHningagain that, the facility
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<br />'~Uliltpr6due-e..';mffic:dent'-wa-ter for,IOOheadof-cattle,then,eed will
<br />,vary,from-l5,O,,' OOOgall-ons-for ,a:S-month'U-&eto-3bO,OOO gallons
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<br />",-(orye-ar';.lGng -ull'e'. "F.o,r'-lin:l-a lIe r operations where fewe r than,
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<br />LOOhe3od ,are,:to,u4;Hize the supply, -the water need will be corre-
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<br />,.spon.ding.ly less;-and,th-e:,t';ea-ted,a~eacan,ber-educed.On moat BLM
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<br />\ ' :. , , , .. ~, .
<br />1'3o-nge -lands-the,aver-age,annual-precipitat,ionvaries from about 6 to
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<br />IQ.---in~-li;..l1l'il' 8" _,.a"",e~~,3.i'lWh~-~d~_ing"3o 7 5-'percent
<br />',,, ,
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<br />r~~'l~t~~,I-oit-,t~~'kl-oi-nd~,i'~;(.~i~ld'i^li~!41Ifgi>Hy le:,!s "than
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<br />l..a-cr-e-'Gf-,,;!'U,Jl,Gff--s,l'e,a-.to--supply the"requirement.s-for,,5 months of
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<br />g'l'a-zing,fo.r--to-O -cattle--atlld"a;!,>pl',o.dmately;1..,;1.;--a-cres f-orthefuU year.
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<br />s1. nee the re are ce'l't~into-.'b-e..l-Gil-&C-IB..f-l'-()~'--eva~~3ot:ioi'l'-aRd othe r
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