BS 3680-4G:1999

Committees responsible
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Characteristics of flat-V weirs
6 Installation
7 Maintenance
8 Measurement of head(s)
9 Discharge relationships
10 Computation of discharge
11 Uncertainties in flow measurement
12 Examples
Annex A (normative) Velocity distribution
Figure 1 Triangular profile flat-V weir
Figure 2 Examples of velocity profiles in the approach
           channel
Figure 3 Arrangements for crest tappings
Tables
1 Ranges of discharge
2 Arrangements for crest tappings
3 Corrections to discharge coefficients
4 Summary of recommended coefficients, limitations and
    tolerances
5 Evaluation of Zh, Zh in terms of Hle/h', Hle/H'
6 CvZh in terms of h'P1 and hle/h'
7 Cdr in terms of hpe/hle
8 CvCdr in terms of hpe/hle and hleh/'p1 = 0.0 up to and
    including 0.5
9 CvCdr in terms of hpe/hle and hle/h, h'/P1 = greater
    than 0.5 and up to and including 1.5
10 CvCdr in terms of hpe/hle and hle/h', h'/P1 = greater than
    1.0 and up to and including 1.5
11 CvCdr in terms of hpe/hle and hle/h', h/P1 = greater than
    1.5 and up to and including 2.0
12 CvCdr in terms of hpe/hle and hle/h', h'P1 = greater than
    2.0 and up to and including 2.5
13 Cdr in terms of H2e/Hle
14 Example of modular discharge calculation
15 Example of modular discharge coefficients

Covers procedures for flow measurements in rivers and artificial channels under steady or slowly varying conditions by means of flat-V weirs.