ASTM_D_5472_-_D_5472M_-_14.pdf

Designation:D5472/D5472M14Standard Test Method 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 test describes a procedure for conducting a specificcapacity test,computing the specific capacity of a control well,and estimating the transmissivity in the vicinity of the controlwell.Specific capacity is the well yield per unit drawdown atan identified time after pumping started.1.2 This test method is used in conjunction with TestMethod D4050 for conducting withdrawal and injection welltests.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 TestMethod D4106.1.4 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 test method is limited by the capabili-ties of 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 standard 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 standard to consider significant digits used in analysismethods for engineering design.1.7 The values stated in SI units are to be regarded asstandard.Rationalized inch-pound units also are used in thisstandard.Each system of units is to be regarded separately asstandard.1.8 This standard may involve hazardous materials,operations,and equipment.This standard does not addresssafety problems associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2488 Practice for Description and Identification of Soils(Visual-Manual Procedure)D3740 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 HydraulicProperties of Aquifer SystemsD4106 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 For common definitions of terms in this standard,referto Terminology D653.3.2 Symbols and Dimensions:3.2.1 Khydraulic conductivity LT11This 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 June 15,2014.Published August 2014.Originallyapproved in 1993.Last previous edition approved in 2005 as D547293(2005),which was withdrawn February 2014 and reinstated in June 2014.DOI:10.1520/D5472_D5472M-14.2The 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 States1 3.2.2 msaturated thickness L3.2.3 Qdischarge L3T13.2.4 Q/sspecific capacity(L3T1)L13.2.5 rwell radius L3.2.6 sdrawdown L3.2.7 Sstorage coefficient dimensionless3.2.8 Ttransmissivity L2T13.2.9 Tprovisional value of transmissivity L2T13.2.10 telapsed time of pumping T3.2.11 ur2S/4Tt dimensionless3.2.12 W(u)well function of“u”dimensionless3.2.13 c1W(u)/44.Summary of Test Method4.1 A control well is equipped with an accumulated watermeter or other well yield measuring device and the static waterlevel determined after co