1、Designation:D5716/D5716M15Standard Test Method forMeasuring the Rate of Well Discharge by Circular OrificeWeir1This standard is issued under the fixed designation D5716/D5716M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year
2、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 method covers construction and operation of acircular orifice weir for measuring the discharge from a well.Th
3、is test method is a part of a series of standards prepared onthe in situ determination of hydraulic properties of aquifersystems by single-or multiple-well tests.Selection of a welldischarge measurement test method is described in GuideD5737.1.2 The discharge rate determined by this test method isco
4、mmonly used for a number of aquifer test methods and toprovide information for the evaluation of well and pumpperformance.1.3 LimitationsThis test method is limited to the descrip-tion of a method common to hydraulic engineering for thepurpose of groundwater discharge measurement in temporaryor test
5、 conditions.1.4 Much of the information presented in this test method isbased on work performed by the Civil Engineering Departmentof Purdue University during the late 1940s.The essentials ofthat work have been presented in a pamphlet prepared byLayne-Bowler,Inc.2and updated by Layne Western Company
6、,Inc.31.5 All observed and calculated values shall be conform tothe guidelines for significant digits and rounding established inPractice D6026.1.5.1 The procedures used to specify how data are collected/recorded and calculated in this standard are regarded as theindustry standard.In addition they a
7、re 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
8、 of reported data to becommensurate with these considerations.It is beyond the scopeof this document to consider significant digits sused analysismethods for engineering design.1.6 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues state
9、d 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 non-conformance with the standard.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It
10、 is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:4D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3740 Practice for Mini
11、mum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD5737 Guide for Methods for Measuring Well DischargeD6026 Practice for Using Significant Digits in GeotechnicalData2.2 Other Documents:GWPD 10 Estimating discharge from a p
12、umping well by useof a circular orifice weir,United States Geological Survey3.Terminology3.1 Definitions:3.1.1 For definitions of common technical terms used in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:1This test method is under the jurisdiction ofAST
13、M Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved Nov.1,2015.Published December 2015.Originallyapproved in 1995.Last previous edition approved in 2006 as D571695(2006),which was withdrawn July
14、 2015 and reinstated in November 2015.DOI:10.1520/D5716-15.2Measurement of Water Flow Through Pipe Orifice With Free Discharge,Bulletin 501,Layne-Bowler,Inc.,Mission,KS,1958.3Measurement of Water Flow Through Pipe Orifice With Free Discharge,Layne-Western Company,Inc.,Mission,KS,1988.4For referenced
15、 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 I
16、nternational,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.1 circular orifice weira circular restriction in a pipethat causes back pressure that can be measured in a piezometertube.3.2.1.1 DiscussionAlso called orifice tube and orificemeter.3.3 Symbols and Dimensions Used in this Standard:3.3.1 Aorifice plate open area L2.3.3.2 Ccoefficient of discharge for the orifice nd.3.3.3 gacceleration due to gravity LT2.3.3.4 hhead in manometer L.3.3.5 Qcontrol well
