1、Designation:D585018Standard Test Method for(Analytical Procedure)Determining Transmissivity,Storage Coefficient,andAnisotropy Ratio from a Network of Partially PenetratingWells1This standard is issued under the fixed designation D5850;the number immediately following the designation indicates the ye
2、ar 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.Scope*1.1 This test method covers an analytical procedure fordetermini
3、ng the transmissivity,storage coefficient,and ratio ofvertical to horizontal hydraulic conductivity of a confinedaquifer using observation well drawdown measurements froma constant-rate pumping test.This test method uses data froma minimum of four partially penetrating,recommended to bepositioned ob
4、servation wells around a partially penetratingcontrol well.1.2 The analytical procedure is used in conjunction with thefield procedure in Test Method D4050.1.3 LimitationsThe limitations of the technique for deter-mination of the horizontal and vertical hydraulic conductivityof aquifers are primaril
5、y related to the correspondence betweenthe field situation and the simplifying assumption of this testmethod.1.4 UnitsThe values stated in inch-pound units are to beregarded as the standard.The SI units given in parentheses aremathematical conversions,which are provided for informationpurposes only
6、and are not considered standard.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026,unless superseded by this standard.1.6 The procedures used to specify how data are collected/recorded or calculated in this standard
7、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 objective;and it is c
8、ommon practice toincrease or reduce the significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethod or engineering design.1.7 This standard does not purport to address all of thesafety co
9、ncerns,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 This international standard was developed in accor-dance with int
10、ernationally 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:2D653 Te
11、rminology 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 ConstructionD4050 Test Method for(Field Procedure)for Withdrawaland Injection Well Testing for Determining Hyd
12、raulicProperties of Aquifer SystemsD5473/D5473M Test Method for(Analytical Procedure for)Analyzing the Effects of Partial Penetration of ControlWell and Determining the Horizontal and Vertical Hydrau-lic Conductivity in a Nonleaky Confined AquiferD6026 Practice for Using Significant Digits in Geotec
13、hnicalData3.Terminology3.1 Definitions:3.1.1 For definitions of common technical terms in thisstandard,see Terminology D653.3.2 The following definitions from Terminology D653 are1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subc
14、ommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved Jan.1,2018.Published February 2018.Originallyapproved in 1995.Last previous edition approved in 2012 as D5850 95(2012).DOI:10.1520/D5850-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orconta
15、ct 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 Conshoh
16、ocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 used in this standard and are presented for the convenience ofthe user.3.2.1 anisotropyhaving different properties in differentdirections.3.2.2 confine