1、Designation:D5270/D5270M20Standard Practice for(Analytical Procedures)Determining Transmissivity andStorage Coefficient of Bounded,Nonleaky,ConfinedAquifers1This standard is issued under the fixed designation D5270/D5270M;the number immediately following the designation indicates theyear of original
2、 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.1.Scope*1.1 This practice covers an analytical procedure for deter-mining the transmi
3、ssivity,storage coefficient,and possiblelocation of boundaries for a confined aquifer with a linearboundary.This practice is used to analyze water-level or headdata from one or more observation wells or piezometers duringthe pumping of water from a control well at a constant rate.This practice also
4、applies to flowing artesian wells dischargingat a constant rate.With appropriate changes in sign,thispractice also can be used to analyze the effects of injectingwater into a control well at a constant rate.1.2 The analytical procedure in this practice is used inconjunction with the field procedure
5、in Test Method D4050.1.3 LimitationsThe valid use of this practice is limited todetermination of transmissivities and storage coefficients foraquifers in hydrogeologic settings with reasonable correspon-dence to the assumptions of the Theis nonequilibrium method(see Practice D4106)(see 5.1),except t
6、hat the aquifer is limitedin areal extent by a linear boundary that fully penetrates theaquifer.The boundary is assumed to be either a constant-headboundary(equivalent to a stream or lake that hydraulicallyfully penetrates the aquifer)or a no-flow(impermeable)boundary(equivalent to a contact with a
7、significantly lesspermeable rock unit).The Theis nonequilibrium method isdescribed in Practices D4105/D4105M and D4106.1.4 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,ea
8、ch system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.Reporting of results in units otherthan SI shall not be regarded as nonconformance with thisstandard.1.5 All observed and calculated values shall conform to thegui
9、delines for significant digits and rounding established inPractice D6026.1.6 This practice offers a set of instructions for performingone or more specific operations.This document cannot replaceeducation or experience and should be used in conjunctionwith professional judgment.Not all aspects of the
10、 practice maybe applicable in all circumstances.This ASTM standard is notintended to represent or replace the standard of care by whichthe adequacy of a given professional service must be judged,nor should this document be applied without the considerationof a projects many unique aspects.The word“S
11、tandard”inthe title of this document means only that the document hasbeen approved through the ASTM consensus process.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
12、safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment o
13、f International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3740 Practice for Minimum Requirements for AgenciesEngaged in Tes
14、ting 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 Techniques1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility o
15、f Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1992.Last previous edition approved in 2014 as D5270 96(2014).DOI:10.1520/D5270_D5270M-20.2For referenced ASTM standards,visit the ASTM website,www.astm.o
16、rg,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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principl