ASTM_D_4105_-_D_4105M_-_15e1.pdf

Designation:D4105/D4105M151Standard Test Method for(Analytical Procedure)for Determining Transmissivity andStorage Coefficient of Nonleaky Confined Aquifers by theModified Theis Nonequilibrium Method1This standard is issued under the fixed designation D4105/D4105M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEEditorially corrected designation to match the units of measurement statement in September 2015.1.Scope*1.1 This test method covers an analytical procedure fordetermining transmissivity and storage coefficient of a non-leaky confined aquifer under conditions of radial flow to a fullypenetrating well of constant flux.This test method is a shortcutprocedure used to apply the Theis nonequilibrium method.TheTheis method is described in Test Method D4106.1.2 This test method,along with others,is used in conjunc-tion with the field procedure given in Test Method D4050.1.3 LimitationsThe limitations of this test method areprimarily related to the correspondence between the fieldsituation and the simplifying assumptions of this test method(see 5.1).Furthermore,application is valid only for values ofu less than 0.01(u is defined in Eq 2,in 8.6).1.4 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.4.1 The procedures used to specify how data are collected/recorded or calculated,in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analyticalmethods for engineering design.1.5 UnitsThe values stated in either SI Units or inch-pound units are to be regarded separately as standard.Thevalues in each system may not be exact equivalents;thereforeeach system shall be used independently of the other.Combin-ing values from the two systems may result in non-conformance with the standard.Reporting of test results inunits other than SI shall not be regarded as nonconformancewith this test method.1.6 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 ContainedFluidsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4043 Guide for Selection of Aquifer Test Method inDetermining Hydraulic Properties by Well TechniquesD4050 Test Method for(Field Procedure)for Withdrawaland Injection Well Testing for Determining HydraulicProperties of Aquifer SystemsD4106 Test Method for(Analytical Procedure)for Deter-mining Transmissivity and Storage Coefficient of Non-leaky Confined Aquifers by the Theis NonequilibriumMethodD6026 Practice for Using Significant Digits in GeotechnicalData3.Terminology3.1 Definitions:3.1.1 For common definitions of terms in this standard,referto Terminology D653.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved April 15,2015.Published May 2015.Originallyapproved in 1991.Last previous edition approved in 2008 as D4105 96(2008).DOI:10.1520/D4105_D4105M-15E01.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 Symbols and Dimensions:3.2.1 K LT1hydraulic conductivity.3.2.2 Kxyhydraulic conductivity in the horizontal direc-tion.3.2.3 Kzhydraulic conductivity in the vertical direction.3.2.4 T L2T1transmissivity.3.2.5 Sdimensionless storage coefficient.3.2.6 Ss L1specific storage.3.2.7 s Ldrawdown.3.2.8 Q L3T1discharge.3.2.9 r Lradial distance from control well.3.2.10 t Ttime.3.2.11 b Lthickness of the aquifer.3.2.12 udimensionless time parameter.4.Summary of Test Method4.1 This test method describes an analytical procedure foranal