ASTM_D_5472_-_D_5472M_-_20.pdf

Designation:D5472/D5472M20Standard Practice forDetermining Specific Capacity and EstimatingTransmissivity at the Control Well1This standard is issued under the fixed designation D5472/D5472M;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.1.Scope*1.1 This practice describes a procedure for conducting aspecific capacity test,computing the specific capacity of acontrol well,and estimating the transmissivity in the vicinity ofthe control well.Specific capacity is the well yield per unitdrawdown at an identified time after pumping started.1.2 This practice is used in conjunction with Test MethodD4050 for conducting withdrawal and injection well tests.1.3 The method of determining transmissivity from specificcapacity is a variation of the nonequilibrium method of Theis(1)2for determining transmissivity and storage coefficient of anaquifer.The Theis nonequilibrium method is given in PracticeD4106.1.4 LimitationsThe limitations of the technique for deter-mining transmissivity are primarily related to the correspon-dence between the field situation and the simplifying assump-tions of the Theis method.1.5 The scope of this practice is limited by the capabilitiesof the apparatus.1.6 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.6.1 The procedures used to specify how data are collected/recorded and calculated in this practice are regarded as theindustry standard.In addition,they are representative of thesignificant digits that should generally 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 com-mensurate with these considerations.It is beyond the scope ofthis practice to consider significant digits used in analysismethods for engineering design.1.7 UnitsThe values stated in SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues for the two systems may result in nonconformance withthe standard.Reporting of results in units other than SI shallnot be regarded as noncompliance with this standard.1.8 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 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“Standard”inthe title of this document means only that the document hasbeen approved through the ASTM consensus process.1.9 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.10 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2488 Practice for Description and Identification of Soils(Visual-Manual Procedures)D3740 Practice for Minimum Requirements for Agencies1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1993.Last previous edition approved in 2014 as D547214.DOI:10.1520/D5472_D5472M-20.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For 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 StatesThis international standard was developed in accord