NBN EN ISO 6416 : 2005

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Applications
   4.1 Open channels
   4.2 Multiple channels
   4.3 Closed conduits
5 Method of measurement
   5.1 Discharge
   5.2 Calculation of discharge from the transit-time
         measurement
6 Flow velocity determination by the ultrasonic (transit
   time) method
   6.1 Principle
   6.2 Sound propagation in water
7 Gauge configuration
   7.1 General
   7.2 Single-path systems
   7.3 Multi-path systems
   7.4 Crossed path systems
   7.5 Reflected-path systems
   7.6 Systems using transponders
   7.7 Systems using divided cross-sections
   7.8 Sloping paths
8 Calculation of discharge
   8.1 Single-path systems
   8.2 Multi-path systems
   8.3 Systems with transducers in the channel
9 System calibration
   9.1 General
   9.2 Single-path systems
10 Site selection
   10.1 Practical constraints
   10.2 Physical constraints of the measurement site
   10.3 Physical constraints which are distant from the
         measurement site
11 Site survey - Before design and construction
   11.1 General
   11.2 Visual survey
   11.3 Survey of the cross-section
   11.4 Survey of velocity distribution
   11.5 Survey of signal propagation
   11.6 Other survey activities
12 Operational measurement requirements
   12.1 General
   12.2 Basic components of flow determination
   12.3 Water velocity determination
   12.4 Determination of water stage or depth
   12.5 Channel width
13 Gauging station equipment
   13.1 General
   13.2 Design and construction of equipment
   13.3 Reflectors
   13.4 Civil engineering works
   13.5 Signal timing and processing
   13.6 System self-checking
   13.7 Site-specific data (or site parameters)
   13.8 Clock and calendar
   13.9 System performance criteria
   13.10 System output
   13.11 Installation
   13.12 Commissioning
   13.13 Operating manual
   13.14 Maintenance
14 Measurement uncertainties
   14.1 General
   14.2 Definition of uncertainty
   14.3 Uncertainty in discharge
Bibliography

Defines the establishment and operation of an ultrasonic (transit-time) gauging station for the continuous measurement of discharge in a river, an open channel or a closed conduit.