ASTM_D_8203_-_18.pdf

Designation:D820318Standard Test Method forDetermination of the Horizontal Water Flow Rate of aGeosynthetic Screening Material,Product,or Device1This standard is issued under the fixed designation D8203;the number immediately following the designation indicates the year 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.Scope1.1 This test method covers test procedures for determiningthe horizontal water flow rate through a geosynthetic orgeosynthetic-enhanced screening device,such as a sedimentretention device(SRD),under a constant-head pressure.Thetest is conducted with potable water.1.2 This test is intended to be used for quality control andproduct development efforts,but should not be considered aperformance test.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forinformation purposes only.1.4 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.1.5 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:2D4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD5819 Guide for Selecting Test Methods for ExperimentalEvaluation of Geosynthetic Durability3.Terminology3.1 Definitions:3.1.1 For definitions of common technical terms used in thisstandard,refer to Terminology D4439.3.2 Definitions of Terms Specific to This Standard:3.2.1 geosynthetic screening device,ngeosynthetic orgeosynthetic-enhanced materials,products,or devices thatprimarily provide the screening function,such as a sedimentretention device(SRD).3.2.2 screeninga geosynthetic,placed across the path of aflowing fluid(ground water,surface water,wind),carryingparticles in suspension,provides screening when it retainssome or all fine soil particles while allowing the fluid to passthrough.After some period of time,particles accumulateagainst the screen,which requires that the screen be able towithstand pressures generated by the accumulated particles andthe increasing pressure from accumulated fluid.(See GuideD5819.)3.2.3 sediment retention device(SRD),na material,product,or device designed to intercept sediment-laden flow,screening out suspended solids and reducing the velocity of theflow,causing transported sediments to settle out.Typical SRDsinclude silt fences,as well as natural or manmade materialsencapsulated in geosynthetic fabrics,meshes,or nettings suchas wattles,filter logs,fiber filtration tubes,fiber rolls,andcompost socks.4.Summary of Test Method4.1 Atest specimen is positioned vertically across the mouthof a“box”reservoir,and potable water is introduced upstreamand maintained at a predetermined constant head as the wateris allowed to seep through the specimen.Once a steady-stateflow condition is established,a discharge volume and theassociated time are measured.5.Significance and Use5.1 The test method simulates the flow conditions(withoutsediment)applicable to sediment retention devices exposed tosheet-flow runoff.Horizontal flow rate is an inherent(index)property of sediment retention devices(SRDs),and can beused to control quality and to assess the effects of productchanges.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-thetic Erosion Control.Current edition approved June 1,2018.Published June 2018.Originallyapproved in 2018.DOI:10.1520/D8203-18.2For 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.Copyright 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 Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Apparatus6.1 Upper“Box”Reservoir,constructed from marine-gradeplywood,plexiglas,aluminum,or other material.The boxshould be watertight and constructed as shown in Fig.1.NOTE1The box end opening is appro