ASTM_C_1745_-_C_1745M_-_11.pdf

Designation:C1745/C1745M11Standard Test Method forMeasurement of Hydraulic Characteristics of HydrodynamicStormwater Separators and Underground Settling Devices1This standard is issued under the fixed designation C1745/C1745M;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.Scope1.1 This test method concerns measurement of selectedhydraulic characteristics of hydrodynamic separators and un-derground settling devices critical to their function as storm-water treatment devices.1.2 Units tested shall be of a size commonly manufactured,not a scale model.1.3 As each stormwater treatment device is unique indesign,so are its hydraulic characteristics(flow versus headand loss coefficients).A sufficient number of accurately mea-sured data points are needed to define properly the hydrauliccharacteristics of each test unit.Therefore,it is imperative thatthe unit setup and subsequent testing methodologies be welldefined and executed to ensure accurate flow and elevationdata.1.4 This test method addresses gravity flow operation only.It does not address performance of units operating underpressurized conditions.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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 determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D3858 Test Method for Open-Channel Flow Measurementof Water by Velocity-Area MethodD4409 Test Method for Velocity Measurements of Water inOpen Channels with Rotating Element Current MetersD5089 Test Method for Velocity Measurements of Water inOpen Channels with Electromagnetic Current MetersD5242 Test Method for Open-Channel Flow Measurementof Water with Thin-Plate WeirsD5389 Test Method for Open-Channel Flow Measurementby Acoustic Velocity Meter SystemsD5413 Test Methods for Measurement of Water Levels inOpen-Water BodiesD5640 Guide for Selection of Weirs and Flumes for Open-Channel Flow Measurement of Water2.2 ASME Standard:3MFC-3M Measurement of Fluid Flow in Pipes Using Ori-fice,Nozzle,and Venturi3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 inlet(or outlet)rounding,nradius of fillet at insidepipe junction with separator structure.4.Summary of Test Method4.1 This test method describes procedures and equipmentrequired to measure the hydraulic characteristics of hydrody-namic separators and underground settling devices used fortreating stormwater runoff.4.2 Other standards that may be useful to reference include:Test Methods D3858,D4409,D5089,D5242,D5389,D5413,Guide D5640,and ASME MFC-3M(see Section 2).5.Significance and Use5.1 Each device has unique flow patterns and turbulencecharacteristics.In addition,each device exhibits a wide rangeof efficiencies as discharge,particle size,particle density,andflow viscosity(that is,water temperature)change.The testingprocedure in Section 7 will help develop the parameters1This test method is under the jurisdiction of ASTM Committee C27 on PrecastConcrete Products and is the direct responsibility of Subcommittee C27.70 onPrecast Concrete Products for Stormwater Management.Current edition approved Sept.15,2011.Published October 2011.DOI:10.1520/C1745_C1745M-11.2For 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.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 necessary to input into a function that describes the perfor-mance of a device under a wide range of application condi-tions.6.Apparatus6.1 The test unit shall be set up to reflect actual fieldinstallation parameters to the greatest degree possible.Influentand effluent pipes shall have a Mannings roughness coefficientnot greater than 0.013 and shall be the minimum diameterrecommended by the device manufacturer.Pipe type,diameter,slope(2 to 3%),orientation,and inlet/outlet roundings shall berecorded and reported for each test.The influent pipe shall bea minimum of ten pipe diameters in length,or 6 m 20 ftwhichever is less,to ensure a uniform appro