1、Designation:D5920/D5920M20Standard Practice for(Analytical Procedure)Tests of Anisotropic UnconfinedAquifers by Neuman Method1This standard is issued under the fixed designation D5920/D5920M;the number immediately following the designation indicates theyear of original adoption or,in the case of rev
2、ision,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 transmissivity,storage coefficient,spe
3、cific yield,and horizontal-to-vertical hydraulic conductivity ratio of anunconfined aquifer.It is used to analyze the drawdown of waterlevels in piezometers and partially or fully penetrating obser-vation wells during pumping from a control well at a constantrate.1.2 The analytical procedure given i
4、n this practice is used inconjunction with Guide D4043 and Test Method D4050.1.3 The valid use of the Neuman method is limited todetermination of transmissivities for aquifers in hydrogeologicsettings with reasonable correspondence to the assumptions ofthe theory.1.4 UnitsThe values stated in either
5、 SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.Reporting of test
6、result in unitsother than SI shall not be regarded as nonconformance withthis standard.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.5.1 The procedures used to specify how data are collected/recorded or calcul
7、ated in the 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
8、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 analysismethods for engineering data.1.6 This practice offers a set of instructions
9、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 o
10、f 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.
11、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 safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 Th
12、is 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(
13、TBT)Committee.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 Aquife
14、r Test Method inDetermining Hydraulic Properties by Well TechniquesD4050 Test Method for(Field Procedure)for Withdrawaland Injection Well Testing for Determining HydraulicProperties of Aquifer Systems1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct res
15、ponsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved May 15,2020.Published May 2020.Originallyapproved in 1996.Last previous edition approved in 2014 as D5920-14.DOI:10.1520/D5920_D5920M-20.2For referenced ASTM standards,visit the ASTM website,www.
16、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 accordance with internationally recognized principles on standardization established in the Decision on Pr
