IS 14765: Determination of Water Retention Capacity in Soils - Method of Test

8 Pages·2000·1.1 MB·English

by  Bureau of Indian Standards

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IS 14765 (2000): Determination of Water Retention Capacity
in Soils - Method of Test [FAD 7: Soil Quality and
Gertilizers]
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IS 14765 : 2000

Indian Standard
NOITANIMRETED FO RETAW NOITNETER YTICAPAC
NI SLIOS - METHOD FO TSET
SK 080.31

--
0 BIS 2000
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

.Junwir), 2000 Price Group 1
Soil Quality and tnemevorpmI lanoitceS ,eettimmoC DAF 27
DROWEROF
sihT naidnI dradnatS was adopted yb the uaeruB of naidnl ,sdradnatS after the draft dezilanif yb the lioS
ytilauQ dna tnemevorpmI lanoitceS eettimmoC had neeb devorppa yb the dooF dna erutlucirgA noisiviD
.licnuoC
ehT ytiliba of lios ot store water si dellac sti water noitneter .yticapac sihT sdneped nopu the ytitnauq dna
tnemegnarra of suoirav sized particles, namely, sand,-silt and .yalc ecniS water si deniater ni the pores created
yb the tnemegnarra of these yramirp ,selcitrap ti si erom etairporppa ot enifed water noitneter ni smret of ,ezis
rebmun dna tnemegnarra of pores rather naht of .selcitrap ehT ytisorop si erom for yalc naht ydnas .lios nI
gnillews slios ytisorop nac ton eb ylesicerp .denifed ,ylralimiS the ecneserp of hgih cinagro nobrac tnetnoc
dna muidos ni the egnahcxe xelpmoc yfidom the water noitneter yticapac of .slios ehT esu of the mret
’yticapac‘ ,si ,revewoh nidaelsim g as the retaw-lios metsys si ton citats tub .cimanyd ehT water tnemevom
does ton nigeb or cease at a ralucitrap eulav of retaw-lios tnetnoc tub si a suounitnoc process. roF siht nosaer
the esu of retaw-lios stnatsnoc hcus as cipocsorgyh tneiciffeoc tniop si ton preferred as these tneserper emos
yrartibra .seulav More tnatropmi si the ygrene htiw hcihw water si dleh ni the ,lios osla demret as the
’ytisnetni‘ .retemarap ehT ygrene of water ni a detarutas lios si ylraen the emas as that of erup free water at
the emas erutarepmet dna .noitavele ,revewoH htiw the decrease ni water tnetnoc of ,lias evitprosda dna
yrallipac forces emoceb ylgnisaercni tnatropmi dna yltneuqesnoc decrease the laitnetop ygrene yticapac( ot do
work) of lios water. ehT latot laitnetop ygrene of water ni lios si dedivid otni ruof ,stnenopmoc ,yleman )i( the
cirtam ,laitnetop eud ot noitcartta of lios xirtam for water, )ii( the citomso laitnetop eud ot devlossid ,stlas
)iii( the lanoitativarg laitnetop eud ot ,noitisop dna )vi( the erusserp laitnetop eud ot lanretxe gas erusserp or
water .nmuloc nI detarutas lios the cirtam laitnetop si ,elbigilgen elihw for detarutasnu slios the erusserp
laitnetop si .elbigilgen
cirtaM laitnetop stluser morf forces detaicossa htiw the ladioloc xirtam dna sedulcni forces detaicossa htiw
,noitprosda ,ytirallipac dna devruc retaw-ria .secafretni sihT si denifed htiw respect ot a free water at the emas

noitavele erutarepmet dna .erusserp tI has a evitagen ngis hcihw si netfo expressed as cirtam noitcus or lios

erutsiom .noisnet ecniS the noitcus dna noisnet smret are sevlesmeht evitagen these are desu htiw a evitisop
.ngis
ehT retaw-lios si ton yllauqe elbaliava ot the stnalp ni the eritne erutsiom-lios egnar morf noitarutas ot yna
eulav ni the yrd .egnar sA the cirtam laitnetop decreases so si the decrease ni water .ytilibatiava ehT fo’egnar
water laitnetop of larutlucirga ecnacifingis si yllausu morf 3/l- (or 01/l- for coarse derutxet slios ot 51- rab
rednu elbarea lios ,snoitidnoc dna neewteb evitisop heads 51- rab rednu ciboreanu .)snoitidnoc ehT elcitrap
dna ezis-erop snoitubirtsid are detcelfer ni the pihsnoitaler neewteb water tnetnoc dna water laitnetop of a
.lios ehT sevruc gniwohs the pihsnoitaler are nwonk as lios‘ erutsiom citsiretcarahc .’sevruc esehT sevruc are
ton euqinu ni character as yeht tibihxe niatrec tnuoma of siseretsyh eud ot rieht ycnedneped no lios erutcurts
tub do edivorp lufesu noitamrofni no elbaliava water storage yticapac of ,slios erutsiom noitelped at a
ralucitrap noitcus dna cisab noitamrofni gnidrager retaw-lios .spihsnoitaler
SI 14765 : 2000
Indian Standard
NOITANIMRETED FO RETAW NOITNETER YTICAPAC
NI SLIOS - METHOD FO TSET
1 SCOPE ,)selpmas (3) ,ecnalaB (4) gniyrD ,nevo (5)
erutsioM ,snac (6) egniryS or ,ettepip (7) eveiS
sihT dradnats sebircserp dohtem for noitanimreted of
(2 mm ezis ot prepare debrutsid lios ,)selpmas
water noitneter yticapac ni .slios
(8) rebbuR sgnir 1 mc hgih dna tuoba 6 mc
2 DETERMINAT-fON OF WATER RETENTION retemaid ot niatnoc debrutsid lios ,selpmas
CAPACITY IN SOILS (9) lioS gnilpmas sregua ot draw debrutsid
dna debrutsidnu lios ,selpmas (10) muucaV
2.1 Principle
,rotaccised (11) Motor operated noitcus .pmup
nI a detarutas lios at muirbiliuqe htiw free water at
2.3 Procedure
the emas ,noitavele the lautca erusserp si ,cirehpsomta
dna ecneh the citatsordyh erusserp dna the noitcus or 4 Tension Table - nI noisnet elbat the elbixelf
noisnet are zero. sA noitcus si desaercni or water citsalp gnibut si dellit htiw dellitsid water
erusserp semoceb rehgih naht cirehpsomta the tsegral tuohtiw yna ria .elbbub tI si neht decalp no a
pores hcihw nac ton niater water tsniaga siht elbavom mra of a dnats gnivah a .elacs ehT
gnideecxe erusserp nigeb ot .ytpme sihT lacitirc derised noitcus si created yb gniyrav the
noitcus si dellac the yrtne-ria .noitcus .stI eulav si ecnereffid ni eht~ slevel of the dexif renhcuB
yllareneg llams- dna tcnitsid ni derutxet-esraoc dna lennuf at the elddim of elpmas lios core dna
llew aggregated .slios fI noitcus si rehtruf ,desaercni the tniop of wolftuo ni the elbixelf .gnibut
erom water si nward tuo of the lios dna erom of the ehT debrutsidnu lios elpmas si decalp no the
ylevitaler egral pores lliw niard .tuc nI other words detarutas deretnis csid ssalg lennuf dna a good
as each tnemercni of water si tsol morf the ,,lios the tcatnoc neewteb the lios dna deretnis etalp
work that tsum eb enod ot evomer the txen tnemercni .derusne ehT lios si ylluf detarutas morf
sesaercni (or lios lliw esaeler water at rehgih deilppa htaenrednu yb gnisiar the tniop of wolftuo of
.)snoitcus ehT ecneulfni of noitcus ot evomer a llams the elbixelf water gnignah .nmuloc retfA
tnemercni of water si tnereffid for each lios as the ,noitarutas revoc the renhcub lennuf ot tneverp
tnuoma of water deniater ni lios at muirbiliuqe si a noitaropave dna rewol the tniop of wolftuo

noitcnit of the sezis dna semulov of the dellif-retaw litnu the derised noitcus si .deniatbo ehT

pores dna ecneh ti si a noitcnuf of the cirtam noitcus noitcus yam eb kept 0, 20, 50, 100, 150 dna
or cirtam .laitnetop sihT noitcnuf si denimreted 200 mc ot enimreted lios water noitneter
yllatnemeirepxe dna detneserper yllacihparg yb a gnidnopserroc ot 0 ,)noitarutas( 0.20, 0.05,
evruc nwonk as erutsiom-lios noitneter ,evruc or -lios 0.10, 0.15 dna 0.20 .rab tA each ,muirbiliuqe
erutsiom .citsiretcarahc nehw the water wolf ceases hguorht the
wolftuo ebut of the gnignah ,nmuloc lios
2.2 Apparatus
elpmas si ,dehgiew deird-revo dna dehgiewer
4 Tension Tub/e - gnitsisnoC of deretnis csid ot niatrecsa the water noitneter yticapac of
ssalg renhcub lennuf of retemaid tyoba 6 mc the lios at that .noitcus yllausU water noitneter
dna thgieh 21-OI ,mc detcennoc ot na -revo pu ot 0.2 rab si denimreted yb siht dohtem
wolf metsys yb snaem of elbixelf tnerapsnart dna dnoyeb siht noitcus ti si denimreted yb
citsalp .gnibut ehT etalp of the lennuf si of erusserp etalp .sutarappa
yltneiciffus enif ytisorop )4-G( ot edulcerp
b) Pressure Plate Apparatus - tuP derised
yrtne-ria revo the egnar of derised .noitcus
rebmun of rebbur sgnir no the cimarec etalp
)b Pressure Plate - (1) erusserP etalp sutarappa .llec tuobA 12 hcus sgnir are detadommocca
etelpmoc htiw lla sgnittif gnidulcni ria ni eno etalp .llec Prepare lios selpmas after
,rosserpmoc dna htiw a egnar of cimarec etalp gnidnirg dna gnissap hguorht a 2 mm -dnuor
sllec (at tsael eno each for 1 dna 15 ,)rab (2) eloh .eveis ruoP a evitatneserper lios elpmas
Brass lios gniniater sgnir 3 mc hgih dna tuoba ylwols htiw the pleh of a noops otni the rebbur
6 mc ni retemaid (as per snoitacificeps of the .gnir tI si retteb ot nur a etacilpud elpmas for
lios gnilpmas regua ot take debrutsidnu lios each lios .epyt leveL the selpmas ni the sgnir
SI 14765 : 2000
dna eton nwod the tuoyal of selpmas decalp gniveis retla the ezis-erop ,noitubirtsid
no the cimarec etalp .llec tuP excess of water ylralucitrap of regral pores, dna the water
ylwols no the etalp llec dna wolla selpmas ot noitneter ni the wol noitcus egnar htiw
etarutas at tsael for 02-61 sruoh ni the debrutsid selpmas yam ton laever the eurt
ecneserp of free water. retfA siht ,doirep .noitamrofni ehT debrutsidnu selpmas are
evomer the excess water morf the cimarec nekat htiw the pleh of yllaiceps dengised -eroc
etalp htiw a ettepip or .egnirys tnuoM the relpmas where there si a noisivorp ot
llec ni the extractor dna tcennoc pu the etadommocca llams ,sgnir 3 mc hgih dna of
wolftuo .sebut esU the citsalp spacers fi there tuoba 6 mc ni .retemaid ehT core relpmas si
are erom naht eno etalp sllec ot eb tup edisni ylwols dehsup otni the lios ot the derised depth
the extractor. esolC lla desunu teltuo ports hguorht repeated sgnippord of the remmah
htiw the gulp stlob that are .dedivorp Check no the .relpmas sihT yaw evitatneserper
that ‘0’ gnir si ni .ecalp tnuoM dil dna screw ) selpmas morf a nevig depth ni the lios eliforp
nwod gnipmalc .stlob dliuB pu the derised are .deniatbo ehT core gniniatnoc sgnir si
erusserp ni the extractor ot the muirbiliuqe detcennocsid dna the sgnir are ylwols dehsup
eulav tahwemos .ylwols tA siht tniop water .tuo ehT excess lios gnidurtorp morf the sgnir
lliw start gniwolf tuo of the teltuo ebut dna si demmirt off dna the lios selpmas gnola
seunitnoc ot wolf llit muirbiliuqe si reached htiw sgnir are wrapped ni the enelyhteylop
edisni the extractor. retfA the muirbiliuqe has sepolevne dna yam eb stored ni the rotaregirfer
neeb ,deniatta the selpmas nac eb .devomer for .esu Rest ofthe erudecorp for gninimreted
tsoM slios lliw approach ciluardyh muirbiliuqe water noitneter yticapac si the emas as
ni eno or two syad gnidneped nopu the lios debircsed for debrutsid lios .selpmas nI
.epyt ylwolS elbaemrep slios ekil ilakla slios tcapmoc dna ylwols elbaemrep slios the emit
yam take regnol .emit tA the esolc of the nur deriuqer for gnitarutas the lios selpmas yam
the erusserp rotaluger si tuhs off dna the eb .dednetxe tI si osla elbarised ot etarutas
erusserp detsuahxe morf the extractor. ehT the lios selpmas ni the muucav .rotaccised nI
gnilpmalc stlob dna dil are devomer dna lios that case the cimarec etalp llec gnola htiw
selpmas derrefsnart yletaidemmi ot the lios selpmas si tup ni the muucav rotaccised
erutsiom .sexob ehT erutsiom sexob detcennoc htiw rotom operated noitcus pmup
gniniatnoc lios selpmas are dehgiew ni the ylbmessa for tuoba 10 setunim erofeb gnicalp
ecnalab dna fresh thgiew si recorded. ehT ni the extractor.
erutsiom sexob are tup ni the gniyrd .nevo
2.4 Calculations
ehT erutarepmet ni the nevo si deniatniam at
-501 C°011 dna selpmas are deird ot a tnatsnoc ehT erutsiom tnetnoc ni the lios ,elpmas after ti has
thgiew at tsael for 12 sruoh dna dehgiewer neeb detarbiliuqe tsniaga the deilppa erusserp dna
after gnilooc ni a .rotaccised enimreteD the nevo ,deird si detaluclac as :swollof
tare thgiew of the erutsiom .snac
tnecreP lios erutsiom tnetnoc yb thgiew (w)
ehT erudecorp si repeated for gninimreted thgieW( of wet lios + tare) - thgieW( of
water noitneter at other muirbiliuqe serusserp yrd lios + tare)
= x 100
ot tcurtsnoc the evruc revo the eritne -lios
thgieW( of yrd lios + tare) - (tare) --
erutsiom .egnar tI si elbarised ot enimreted
retaw-lios noitneter at muirbiliuqe serusserp Loss ni thgiew no gniyrd (M,,,)
W )tnecreP( = x 100
of 0, ,05/l ,02/l ,01/l ,3/l ,2/l 1, 5, 10 dna
thgieW of nevo yrd lios (MS)
15 .rab A tolp of lios erutsiom tnetnoc no(
the )sixa-X susrev noitcus no( the )sixa-Y si tnecreP lios erutsiom tnetnoc yb emulov (0)
.nward hcuS sevruc nac eb nward for tnereffid
w x klub ytisned (PJ for the lios depth
lios sepyt dna water noitneter at yna nevig =
noitcus nac eb deniatbo morf these .sevruc ytisneD of water (P,)
,oslA 0 = w ’ bP
tI si retteb ot ekam these snoitanimreted no Here J%v = 1 g ”mc
debrutsidnu lios selpmas as gnidnirg dna Depth of water ni the lios - 0 x lios depth.

2
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Review of Indian Standards
stnemdnemA are deussi ot sdradnats as the deen sesira no the sisab of .stnemmoc sdradnatS are osla
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sihT naidnI dradnatS has neeb depoleved morf Dot : No. DAF 27 (107).
Amendments Issued Since Publication
dnemA No. Date of eussI txeT detceffA
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