BS 3680-3D:1980

National foreword
Cooperating organizations
Methods
1 Scope and field of application
2 References
3 Definitions
4 Units of measurement
5 General
6 Principle of the moving-boat method
7 Limitations
8 Equipment
9 Measurement procedures
10 Computation of discharge
11 Accuracy of flow measurement
Annexes
A Description of the instruments and the functions of
    the crew members
B A step-by-step outline of the computation procedure
    which refers to the examples of measurement notes
    for method 1 and method 2 shown in tables 1 and 2
    respectively as a guide to the computer
Tables
1 Sample of computation notes of a moving-boat
    measurement - Method 1
2 Sample of computation notes of a moving-boat
    measurement - Method 2
3 Rating table for moving-boat meter No. 2-4
4 Table of lb, in metres
5 Sine of angle alpha
Figures
1 Sketch of stream with markers
2 General diagrams of velocity vectors
3 Definition sketch of midsection method of
    computation superimposed over a facsimile of an
    echo-sounder chart
4 Discharge hydrograph prepared from current meter
    measurements and showing moving-boat check
    measurements; Hudson river at Poughkeepsie, N.Y.,
    August 30, 1966
5 Typical control panel of rate indicator and counter
    - Method 1
6 Comparison of actual and computed values of
    incremental widths
7 Comparison for deviations from cross-section or in
    the direction of flow
8 Sketch of boat showing equipment - Method 1

Gives the methods of measuring discharge in large rivers and estuaries by the moving-boat method. General description of the various procedures and equipment used and the method of computation of discharge.

This International Standard specifies methods for measuring discharge in large rivers and estuaries by the moving-boat technique. In the following sections procedures applicable to this method and the general requirements of equipment are covered. A complete facsimile example of computation of a moving boat measurement is given in the annexes.