\\. \. Kkmn 



407 



moi.sluro coiiloiif. Il in ol' courni" iio.s.siltlo tliiit holli ol IIichc iillcniiilivcH 

 will ()|)(Miilc to^jciluT in Mio noil, 'I'lic fornicr will tiliiiosi- ci-iliiiiily occur, 

 1() ju(li,'c by a poncnil Hurv(\v d tlic ihilii, iJoiiyoucos advftiiceH for tlio 

 conconlriition ol llir Mciil Moiiilioii. IIh (',\|iiM,ii.'Hi(m i.n ii iiuillcr of f^'i'ciii 

 coinph^xily niul i.s noh (dii.Hidcrcd in I lie ihchciiI. |»i|>('I', wliicli w (icvof(Ml 

 fo Mic Hccoiui iiHcniiilivc, 1 hiil llic act ual aJiioiml. of iinfrcc water cliangcH 

 w il 11 I Ik' IoIiiI riKiisI iiti' <(p|ilrii( . 



Let. l'„ l)C the ainoiinl. n1 J'rri' wiiU'T, wlicii iJic total inoiHt-iii'c coiit,(Mit. 

 is M„, ami />„ lie the corrcHpoiulint,' free/iiifi-poiiit <lcpi('n.sioii. We 

 liiivc I III' L'lMiciMJ ciinal ion : 



A', wlirir A' is a (•(iiiHliaiifc, 



A' 



yj>., 



or 



)■ 



n.r 



Y,- 



llic .siiiidy l(iaiii soil (Talilc II) wo 



K ,. K 



I'.siiif^ again the li^iu'cs of />„ loi 

 obtain u. aeries of values lor )'„: 



A- __K 



Till' sullix of )' indicates the corresponding value o 

 nioislure content. The values of ) 



y — " • v 



025 • 



f yi/„. the t.otal 



o )'||| can be obtained in Icrnis of 



)■ 



)V .substituting -O'ir))'.,, for A' in ea.ch case: 



Y,, = -385 Y,, 



13 



•287 Fj, > 



Y,, = -W2Y, 



(I) 



Y„ =•1147,, 



Y, = -064 y„J 



This set of ecpiations shows that the actual amount of free water 

 ra])idly diniinislies as the total moisture content decreases, i^'or instance, 

 comparing y,„ with Y„, the. amount, of free water decreases to about 

 jtli. while the total Wilier is drcrea.sed only by J. This in<lica,tes tluit 

 the amounlH of free and unfree vva.ter bear respectively a. decreasing 

 and increasing percentage ratio to the amount of total water, as the 

 hitler diminishes. Thai llie rehili(Mi of the free, a.nd therefore the unfree 

 water, to the toliil inoislure is (pia.nl it ative can l)e clearly seen by an 

 insi)ection of Kig. .'5. in which the amount of free water, expressed in 

 terms of )'.,, (e<piations (I)) is plot led Mga.inst tin- tot id moisture. In the 

 .same ligiire I he curve for clay .soil (Tiiblc II) is also given, the v;dues 



27 2 



