BS ISO 3846:2008

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Installation
   5.1 General
   5.2 Selection of site
   5.3 Installation conditions
6 General maintenance requirements
7 Measurement of head(s)
   7.1 General
   7.2 Stilling or float well
   7.3 Zero setting
8 Rectangular broad-crested weirs
   8.1 Specification for the standard weir
   8.2 Location of the head gauge section
   8.3 Provision for modular flow
9 Discharge relationships
   9.1 Modular flow discharge equation
   9.2 Modular coefficient of discharge
   9.3 Limitations for operation in the modular
        flow range
   9.4 Drowned flow discharge equation
   9.5 Limitations for operation in the drowned flow range
10 Uncertainties in flow measurement
   10.1 General
   10.2 Statement of the uncertainty of a flow
        measurement in a channel
   10.3 Combining measurement uncertainties
   10.4 Uncertainty of discharge coefficient u(C) for the
        broad-crested weir
   10.5 Uncertainty budget
11 Example
   11.1 General
   11.2 Characteristics - Gauging structure
   11.3 Characteristics - Gauged head instrumentation
   11.4 The discharge coefficient
   11.5 The discharge estimate
   11.6 Uncertainty statement
Annex A (informative) - Modular limit
Annex B (informative) - Gauged head discharge coefficient
                        and total head discharge coefficient
Annex C (informative) - Introduction to measurement uncertainty
Annex D (informative) - Sample measurement performance for use
                        in hydrometric worked examples
Bibliography