ASTM_D_5270_-_96_2014.pdf

Designation:D527096(Reapproved 2014)Standard Test Method forDetermining Transmissivity and Storage Coefficient ofBounded,Nonleaky,Confined Aquifers1This standard is issued under the fixed designation D5270;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,storage coefficient,and possiblelocation of boundaries for a confined aquifer with a linearboundary.This test method is used to analyze water-level orhead data from one or more observation wells or piezometersduring the pumping of water from a control well at a constantrate.This test method also applies to flowing artesian wellsdischarging at a constant rate.With appropriate changes insign,this test method also can be used to analyze the effects ofinjecting water into a control well at a constant rate.1.2 The analytical procedure in this test method is used inconjunction with the field procedure in Test Method D4050.1.3 LimitationsThe valid use of this test method is limitedto determination of transmissivities and storage coefficients foraquifers in hydrogeologic settings with reasonable correspon-dence to the assumptions of the Theis nonequilibrium method(see Test Method D4106)(see 5.1),except that the aquifer islimited in areal extent by a linear boundary that fully penetratesthe aquifer.The boundary is assumed to be either a constant-head boundary(equivalent to a stream or lake that hydrauli-cally fully penetrates the aquifer)or a no-flow(impermeable)boundary(equivalent to a contact with a significantly lesspermeable rock unit).The Theis nonequilibrium method isdescribed in Test Methods D4105 and D4106.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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 DefinitionsFor definitions of general technical termsused within this practice,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 constant-head boundarythe conceptual representa-tion of a natural feature such as a lake or river that effectivelyfully penetrates the aquifer and prevents water-level change inthe aquifer at that location.3.2.2 equipotential linea line connecting points of equalhydraulic head.A set of such lines provides a contour map ofa potentiometric surface.3.2.3 image wellan imaginary well located opposite acontrol well such that a boundary is the perpendicular bisector1This 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 Feb.1,2014.Published February 2014.Originallyapproved in 1992.Last previous edition approved in 2008 as D5270 96(2008).DOI:10.1520/D5270-96R14.2For 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 of a straight line connecting the control and image wells;usedto simulate the effect of a boundary on water-level changes.3.2.4 impermeable boundarythe conceptual representa-tion of a natural feature such as a fault or depositional contactthat places a boundary of significantly less-permeable materiallaterally adjacent to an aquifer.3.3 Symbols and Dimensions:3.3.1 Klndconstant of proportionality,rirr.3.3.2 Q L3T1discharge.3.3.3 r Lradial distance fr