ASTM_D_5093_-_15.pdf

Designation:D509315Standard Test Method forField Measurement of Infiltration Rate Using Double-RingInfiltrometer with Sealed-Inner Ring1This standard is issued under the fixed designation D5093;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes a procedure for measuringthe infiltration rate of water through in-place soils using adouble-ring infiltrometer with a sealed inner ring.1.2 This test method is useful for soils with infiltration ratesin the range of 1 105cm/s to 1 108cm/s.When infiltra-tion rates 1 105cm/s are to be measured Test MethodD3385 shall be used.1.3 All observed and calculated values shall conform to theguide for significant digits and rounding established in PracticeD6026.1.3.1 The method used to specify how data are collected,calculated,or recorded in this standard is not directly related tothe accuracy to which the data can be applied in design or otheruses,or both.How one applies the results obtained using thisstandard is beyond its scope.1.4 This test method provides a direct measurement ofinfiltration rate,not hydraulic conductivity.Although the unitsof infiltration rate and hydraulic conductivity are similar,thereis a distinct difference between these two quantities.Theycannot be directly related unless the hydraulic boundaryconditions,such as hydraulic gradient and the extent of lateralflow of water are known or can be reliably estimated.1.5 This test method can be used for natural soil deposits,recompacted soil layers,and amended soils such as soilbentonite and soil lime mixtures.1.6 UnitsThe values stated in SI units are to be regardedas standard.The values given in parentheses are mathematicalconversions to inch-pound units,which are provided forinformation only and are not considered standard.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3385 Test Method for Infiltration Rate of Soils in FieldUsing Double-Ring InfiltrometerD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD6026 Practice for Using Significant Digits in GeotechnicalData3.Terminology3.1 Definitions:3.1.1 For common definitions of technical terms in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 infiltrationdownward entry of liquid into a porousbody.3.2.2 infiltration rate,Iquantity of liquid entering a po-rous material(m3)per unit area(m2)per unit time(s),expressed in units of m/s.3.2.3 infiltrometera device used to pond liquid on aporous body and to allow for the measurement of the rate atwhich liquid enters the porous body.4.Summary of Test Method4.1 The infiltration rate of water through soil is measuredusing a double-ring infiltrometer with a sealed or covered innerring(Fig.1).The infiltrometer consists of an open outer and asealed inner ring.The rings are embedded and sealed intrenches excavated in the soil.Both rings are filled with watersuch that the inner ring is submerged.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.04 on HydrologicProperties and Hydraulic Barriers.Current edition approved June 1,2015.Published July 2015.Originally approvedin 1990.Last previous edition approved in 2008 as D5093 02(2008).DOI:10.1520/D5093-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 The rate of flow is measured by connecting a flexiblebag filled with a known weight of water to a port on the innerring.As water infiltrates into the ground from the inner ring,anequal amount of water flows into the inner ring from theflexible bag.After a known interval of time,the flexible bag isremoved and weighed.The weight loss,converted to a volume,is equal to the amount of water that has infiltrated into theground.An infiltration rate is then determined from thisvolume of water,the area of the inner ring,and the interval oftime.This process is repeated and a plot of infiltration rateversus time is constructed.The test is continued until theinfiltration rate becomes steady or until it becomes equal t