01713nam a2200265 a 450000100080000000500110000800800410001910000200006024501340008026000490021430000090026349000550027252009320032765000140125965000160127365000170128965000150130665000300132165300210135165300190137265300100139165300140140165300120141570000200142713306032002-11-22               bl uuuu     u0uu1 u    #d1 aMCKENZIE, N. J.  aProcedures for field sampling and laboratory measurement of saturated and unsaturated hydraulic conductivity on large soil cores.  aCanberra : CSIRO -Division of Soils. s.d.c0  a20p.  a(CSIRO Division of Soils. Divisional Report, 125).  aMethods for measuring saturated and unsaturated hydraulic conductivity on large intact soil cores are presented. Soil horizons are wet in the field using a trickle irrigation system before excavation and sampling of the large soil cores. A convenient and accurate method for measuring saturated hydraulic conductivity suited to the large cores is then described. The same cores are used for the measurement of usaturated hydraulic conductivity at potentials close to zero. The system uses a drip infiltrometer to supply water at a constant flux. Unit gradient is achieved by adjusting the potential th the lower boundary with an adjustable outflow tube. Matric potential in the core is monitored using tensiometers and water content is measured gravimetrically. Detailed descriptions of the apparatus and calculations are presented. Alternative methods for supplying water using a constant potential device are also considered.  aAustralia  ameasurement  asoil surveys  aAmostragem  aCondutividade Hidráulica  aGrowndwater flow  aSoils sampling  aSolos  aTechnique  aTecnica1 aJACQUIER, D. W.