ASTM D7208-2006 Standard Test Method for Determination of Temporary Ditch Check Performance in Protecting Earthen Channels from Stormwater-Induced Erosion《测定保护土渠受暴雨腐蚀的临时沟中消能槛性能用标准试.pdf
《ASTM D7208-2006 Standard Test Method for Determination of Temporary Ditch Check Performance in Protecting Earthen Channels from Stormwater-Induced Erosion《测定保护土渠受暴雨腐蚀的临时沟中消能槛性能用标准试.pdf》由会员分享,可在线阅读,更多相关《ASTM D7208-2006 Standard Test Method for Determination of Temporary Ditch Check Performance in Protecting Earthen Channels from Stormwater-Induced Erosion《测定保护土渠受暴雨腐蚀的临时沟中消能槛性能用标准试.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7208 06Standard Test Method forDetermination of Temporary Ditch Check Performance inProtecting Earthen Channels from Stormwater-InducedErosion1This standard is issued under the fixed designation D 7208; the number immediately following the designation indicates the year oforiginal ado
2、ption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the guidelines, requirements,and procedures fo
3、r evaluating the ability of temporary ditchchecks to protect earthen channels from stormwater-inducederosion. Critical elements of this protection are the ability ofthe temporary ditch check to:1.1.1 Slow and/or pond runoff to encourage sedimentation,thereby reducing soil particle transport downstre
4、am;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 ope
5、rations, 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 The values stated in SI
6、 units are to be regarded asstandard. The inch-pound units given in parentheses areprovided for information purposes only.1.5 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-
7、priate safety and health practices and determine 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
8、Standards:2D 698 Test Methods for Laboratory Compaction Character-istics of Soil Using Standard Effort (12,400 ft-lbf/ft3(600kN-m/m3)D 6460 Test Method for Determination of Erosion Control(ECB) Performance in Protecting Earthen Channels fromStormwater-Induced Erosion3. Terminology3.1 Definition of T
9、erm Specific to This Standard:3.1.1 temporary ditch check (in erosion control), nanon-permanent barrier consisting of rocks, straw bales, excel-sior logs, wattles, lumber, rock bags, interlocking pre-castconcrete blocks, or other materials installed or constructedacross a drainage way, swale, or oth
10、er ephemeral waterway toreduce flow velocity, decrease erosion, and promote soilretention.4. Summary of Test Method4.1 The performance of a temporary ditch check in reducingstormwater-induced erosion is determined by subjecting thematerial to simulated stormwater flow in a controlled anddocumented e
11、nvironment.4.2 Key elements of the testing process include:4.2.1 Calibration of the stormwater simulation equipment;4.2.2 Preparation of the test channel;4.2.3 Documentation of the temporary ditch check(s) to betested;4.2.4 Installation of the temporary ditch check(s);4.2.5 Performance of the test;4
12、.2.6 Collection of hydraulic, topographical, and associateddata;4.2.7 Analysis of the resultant data; and4.2.8 Reporting.5. Significance and Use5.1 This test method evaluates temporary ditch checks andtheir means of installation to:5.1.1 Reduce soil loss and sediment concentrations instormwater runo
13、ff under conditions of varying channel condi-tions and soil type; and1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.25.08 on SedimentControl.Current edition approved May 15, 2006. Published July 2006.2For referenc
14、ed 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Co
15、nshohocken, PA 19428-2959, United States.5.1.2 Improve water quality exiting the area disturbed byearthwork activity by reducing suspended solids.5.2 This test method models and examines conditions typi-cally found on construction sites involving earthwork activi-ties, including: highways and roads;
16、 airports; residential, com-mercial and industrial developments; pipelines, mines, andlandfills; golf courses; etc.5.3 This test method is a performance test. It is a compara-tive tool for evaluating the erosion control characteristics ofdifferent temporary ditch checks and can be used for qualityco
17、ntrol to determine product conformance to project specifi-cations. Take caution when comparing results from differentlaboratories because information about between-laboratoryprecision is incomplete and slight differences in soil and otherenvironmental and geotechnical conditions may affect tempo-rar
18、y ditch check performance. Unique project-specific condi-tions should be taken into consideration.6. Apparatus6.1 Water Delivery SystemThe water delivery systemshall include pump(s), piping, channels, and water controlstructures, as necessary, to achieve the desired hydraulicconditions. The water co
19、ntrol structures shall regulate the flowand to direct it into the desired test channel. The water deliverysystem shall be constructed such that turbulence at the entranceto the test channel is minimized. Use of flow straighteners (forexample, tube racks or vanes) are recommended to reduceturbulence
20、and achieve uniform flow conditions. A direct flowsystem (that is, controlled flow diverted from a natural water-way) may also be employed for this purpose. The waterdelivery system in Fig. 1 shows an example of a closed-loopwater delivery system.6.2 Water SourceAny water source shall be suitable fo
21、rthis use provided that it is not sediment laden or containsdeleterious materials that could impair the operation of thepumps.6.3 Total Station SystemThe total station system is astandard surveying instrument that is capable of measuringvertical and horizontal angles, and distance, simultaneously to
22、determine measurement point coordinates (that is, X, Y and Zaxis) and that uses an internal data logger to store thisinformation for future use. In lieu of a total station system,manual surveying equipment may be used provided thatequivalent accuracy is achievable. Periodic calibration andcertificat
23、ion of this equipment shall be performed.6.4 Velocity ProbeA velocity probe capable of measuringpoint velocities to an accuracy of 6 0.03 m/s (0.1 ft/s) shall beused to identify flow conditions during test operation. Accept-able types of probes include electromagnetic, spinning cup,propeller, and st
24、atic tube devices. Periodic calibration andcertification of this equipment shall be performed.6.5 MiscellaneousOther miscellaneous equipment in-cludes: meteorological equipment (wind speed, temperature,precipitation), and cameras or video recorders.7. Procedure7.1 Test Channel Preparation:7.1.1 Cons
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