ASTM_D_5269_-_15.pdf

Designation:D526915Standard Test Method forDetermining Transmissivity of Nonleaky Confined Aquifersby the Theis Recovery Method1This standard is issued under the fixed designation D5269;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 covers an analytical procedure fordetermining the transmissivity of a confined aquifer.This testmethod is used to analyze data from the recovery of waterlevels following pumping or injection of water to or from acontrol well at a constant rate.1.2 The analytical procedure given in this test method,along with several others,is used in conjunction with the fieldprocedure in Test Method D4050.Guide D4043 providesinformation for determining hydraulic properties.1.3 LimitationsThe valid use of the Theis recoverymethod is limited to determination of transmissivities foraquifers in hydrogeologic settings reasonably corresponding tothe assumptions of the Theis theory(see 5.2).1.4 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.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.All observed and calculated values shallconform to the guidelines for significant digits and roundingestablished in Practice D6026,unless otherwise superseded bythis standard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of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 SystemsD4105 Test Method for(Analytical Procedure)for Deter-mining Transmissivity and Storage Coefficient of Non-leaky Confined Aquifers by the Modified Theis Nonequi-librium MethodD4106 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 definitions of common Terminology terms usedwithin this guide refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 observation wella well open to all or part of anaquifer.3.3 Symbols and Dimensions:3.3.1 b Laquifer thickness.3.3.2 K LT1hydraulic conductivity.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 1992.Last previous edition approved in 2008 as D5269 96(2008).DOI:10.1520/D5269-15.2For 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 3.3.2.1 DiscussionThe use of the symbol K for the termhydraulic conductivity is the predominant usage in groundwa-ter literature by hydrogeologists,whereas the symbol k iscommonly used for this term in rock mechanics and soilscience.3.3.3 Krhydraulic conductivity in the plane of the aquifer,radially from the control well.3.3.4 Kzhydraulic conductivity in the vertical direction.3.3.5 lnnatural logarithm.3.3.6 log10logarithm to the base 10.3.3.7 Q L3T1discharge.3.3.8 r Lradial distance from control well.3.3.9 rcLequivalent inside radius of control well.3.3.10 S ndstorage coefficient.3.3.11 s Ldrawdown.3.3.12 scLdrawdown corrected for the effects of reduc-tion in saturated thickness.3.3.13 Syndspecific yield.3.3.14 s Lresidual drawdown.3.3.15 s Lchange in residual drawdown over one logcycle of t/t.3.3.16 T L2T1transmissivity.3.3.17 t Ttime since pumping or injection began.3.3.18 t Ttime sinc