ASTM C1745 / C1745M - 11

    Standard Test Method for Measurement of Hydraulic Characteristics of Hydrodynamic Stormwater Separators and Underground Settling Devices

    Active Standard ASTM C1745 / C1745M | Developed by Subcommittee: C27.70

    Book of Standards Volume: 04.05


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    Significance and Use

    Each device has unique flow patterns and turbulence characteristics. In addition, each device exhibits a wide range of efficiencies as discharge, particle size, particle density, and flow viscosity (that is, water temperature) change. The testing procedure in Section 7 will help develop the parameters necessary to input into a function that describes the performance of a device under a wide range of application conditions.

    1. Scope

    1.1 This test method concerns measurement of selected hydraulic characteristics of hydrodynamic separators and underground settling devices critical to their function as stormwater 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 in design, so are its hydraulic characteristics (flow versus head and loss coefficients). A sufficient number of accurately measured data points are needed to define properly the hydraulic characteristics of each test unit. Therefore, it is imperative that the unit setup and subsequent testing methodologies be well defined and executed to ensure accurate flow and elevation data.

    1.4 This test method addresses gravity flow operation only. It does not address performance of units operating under pressurized conditions.

    1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated 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.

    1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D3858 Test Method for Open-Channel Flow Measurement of Water by Velocity-Area Method

    D4409 Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current Meters

    D5089 Test Method for Velocity Measurements of Water in Open Channels with Electromagnetic Current Meters

    D5242 Test Method for Open-Channel Flow Measurement of Water with Thin-Plate Weirs

    D5389 Test Method for Open-Channel Flow Measurement by Acoustic Velocity Meter Systems

    D5413 Test Methods for Measurement of Water Levels in Open-Water Bodies

    D5640 Guide for Selection of Weirs and Flumes for Open-Channel Flow Measurement of Water

    ASME Standard

    MFC-3M Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi


    ICS Code

    ICS Number Code 13.060.30 (Sewage water)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard

    DOI: 10.1520/C1745_C1745M-11

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM C1745 / C1745M-11, Standard Test Method for Measurement of Hydraulic Characteristics of Hydrodynamic Stormwater Separators and Underground Settling Devices, ASTM International, West Conshohocken, PA, 2011, www.astm.org

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