1、Designation:D720814Standard Test Method forDetermination of Temporary Ditch Check Performance inProtecting Earthen Channels from Stormwater-InducedErosion1This standard is issued under the fixed designation D7208;the number immediately following the designation indicates the year oforiginal adoption
2、 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 the guidelines,requirements,and procedures for evaluating t
3、he ability of temporary ditchcheck systems to protect earthen channels from stormwater-induced erosion.Critical elements of this protection are theability of the temporary ditch check to:1.1.1 Slow or pond runoff,or both,to encouragesedimentation,thereby reducing soil particle transport down-stream;
4、1.1.2 Trap soil particles up stream of structure;and1.1.3 Decrease soil erosion.1.2 This test method utilizes full-scale testing procedures,rather than reduced-scale(bench-scale)simulation,and ispatterned after conditions typically found on construction sitesat the conclusion of earthwork operations
5、,but prior to the startof revegetation work.Therefore this test method considers onlyunvegetated conditions.1.3 This test method provides a comparative evaluation of atemporary ditch check to baseline bare soil conditions undercontrolled and documented conditions.1.4 All observed and calculated valu
6、es shall conform to theguidelines for significant digits and rounding established inPractice D6026 unless superseded by this standard.1.4.1 The procedures used to specify how data are collected/recorded and calculated in this standard are regarded as theindustry standard.In addition,they are represe
7、ntative 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 report
8、ed data to com-mensurate with these considerations.It is beyond the scope ofthis standard to consider significant digits used in analysismethods for engineering design.1.5 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-
9、pound units,which are provided forinformation only and are not considered standard.1.6 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 and health practices and det
10、ermine the applica-bility of regulatory limitations prior to use.Also,the user mustcomply with prevalent regulatory codes,such as OSHA(Oc-cupational Health and Safety Administration)guidelines,whileusing the test method.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock
11、,and ContainedFluidsD698 Test Methods for Laboratory Compaction Character-istics of Soil Using Standard Effort(12 400 ft-lbf/ft3(600kN-m/m3)D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD6026 Pra
12、ctice for Using Significant Digits in GeotechnicalDataD6460 Test Method for Determination of Rolled ErosionControl Product(RECP)Performance in ProtectingEarthen Channels from Stormwater-Induced Erosion3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,see Terminology D653.3
13、.2 Definitions of Terms Specific to This Standard:3.2.1 temporary ditch check(in erosion control),nanon-permanent barrier consisting of rocks,straw bales,excel-sior logs,wattles,lumber,rock bags,interlocking pre-cast1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and
14、 is the direct responsibility of Subcommittee D18.25 on Erosion andSediment Control Technology.Current edition approved Jan.1,2014.Published January 2014.Originallyapproved in 2006.Last previous edition approved in 2006 as D7208 06.DOI:10.1520/D7208-14.2For referenced ASTM standards,visit the ASTM w
15、ebsite,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 States1 con
16、crete blocks,or other materials installed or constructedacross a drainage way,swale,or other ephemeral waterway toreduce flow velocity,decrease erosion,and promote soilretention.3.2.2 trapezoidal test channel,nan earthen channel usedto test erosion control products shaped such that the bottom isflat with sides greater than 90 angle in relation to the bottomof the channel.4.Summary of Test Method4.1 The performance of a temporary ditch check in reducingstormwater-induced erosion is determined by
