We noticed you’re not on the correct regional site. Switch to our AMERICAS site for the best experience.
  • BS 3680-4A(1981) : 1981

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
    Add to Watchlist
    This Standard has been added successfully to your Watchlist.
    Please visit My Watchlist to see all standards that you are watching.
    Please log in or to add this standard to your Watchlist.
    We could not add this standard to your Watchlist.
    Please retry or contact support for assistance.
    You need to be logged in to add this standard to your Watchlist.
    Please log in now or create an account to add.
    You already added this Product in the Watchlist.

    METHODS OF MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - WEIRS AND FLUMES - METHOD USING THIN-PLATE WEIRS

    Available format(s):  Hardcopy, PDF

    Superseded date:  30-05-2008

    Language(s):  English

    Published date:  01-01-1981

    Publisher:  British Standards Institution

    Add to Watchlist

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    Foreword
    Cooperating organizations
    Methods
    1 Scope and field of application
    2 References
    3 Definitions
    4 Units of measurement
    5 Principle
    6 Installation
    7 Measurement of head
    8 Maintenance
    9 Rectangular thin-plate weir
    10 Triangular thin-plate weir
    11 Accuracy of discharge measurement
    12 Examples of uncertainty calculations
    Tables
    1 Discharge of water over a "V"-notch with
        tan (alpha/2) = 1 (alpha = pi/2 radians or 90 deg)
    2 Discharge of water over a "V"-notche with
        tan (alpha/2) = 1/2 (alpha = 0.927 3 radian or
        53 degrees 8')
    3 Discharge of water over a "V"-notch with
        tan (alpha/2) = 1/4 (alpha = 0,489 9 radians,
        28 degrees 4')
    Figures
    1 Examples of normal velocity distribution in
        rectangular channels
    2 Rectangular-notch, thin-plate weir
    3 Determination of gauge-zero for rectangular weir
    4 Coefficient of discharge Ce = a + a' (h/p)
    5 Value of kb related to b/B
    6 Triangular-notch, thin-plate weir
    7 Coefficient of discharge Ce (alpha = 90 degrees)
    8 Coefficient of discharge Ce related to notch angle
        alpha
    9 Value of kh related to notch angle alpha
    ANNEXES
    A (informative) Flow measurement with small weir tanks
    B (informative) Guide to the design and installation of a
    flow straightener

    Abstract - (Show below) - (Hide below)

    Gives methods for measuring water flow in open channels using rectangular and triangular-notch thin-plate weirs. The conditions considered are limited to steady, free and fully ventilated discharge. Recommended discharge coefficients are applicable to water only in the approximate range of temperatures from 5 to 30 degrees C. Using the coefficients for water temperatures several degrees outside this range will result in negligible error except at very small heads. Limitations of applicability related to weir and flow geometry are specified for the recommended formulae.

    General Product Information - (Show below) - (Hide below)

    Committee CPI/113
    Development Note Supersedes 77/31876 DC (07/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS 5316-3(1988) : 1988 SPECIFICATION FOR ACCEPTANCE TESTS FOR CENTRIFUGAL, MIXED FLOW AND AXIAL PUMPS - PRECISION CLASS TESTS
    BS 3680-4D(1989) : 1989 MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - WEIRS AND FLUMES - COMPOUND GAUGING STRUCTURES
    BS 3680-3B(1997) : 1997 MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - STREAM FLOW MEASUREMENT - GUIDE FOR THE ESTABLISHMENT AND OPERATION OF A GAUGING STATION
    BS EN 60041 : 1995 FIELD ACCEPTANCE TESTS TO DETERMINE THE HYDRAULIC PERFORMANCE OF HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP-TURBINES
    BS 3680-2A(1964) : 1964 MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - DILUTION METHODS - CONSTANT RATE INJECTION
    BS 6316(1992) : 1992 CODE OF PRACTICE FOR TEST PUMPING OF WATER WELLS
    BS 599(1966) : 1966 METHODS OF TESTING PUMPS
    BS 4485-2(1988) : 1988 WATER COOLING TOWERS - PART 2: METHODS FOR PERFORMANCE TESTING
    BS 6316(1983) : 1983 CODE OF PRACTICE FOR TEST PUMPING WATER WELLS
    BS 6739(1986) : 1986 CODE OF PRACTICE FOR INSTRUMENTATION IN PROCESS CONTROL SYSTEMS: INSTALLATION DESIGN AND PRACTICE
    BS 3680-4D(1981) : LATEST MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - WEIRS AND FLUMES - COMPOUND GAUGING STRUCTURES

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 4373:2008 Hydrometry Water level measuring devices
    BS 3680-1(1983) : 1983 MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - GLOSSARY OF TERMS
    BS 3680-4C(1981) : 1981 METHODS OF MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - PART 4: WEIRS AND FLUMES - PART 4C: FLUMES
    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective