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BS EN ISO 6416:2017 Hydrometry. Measurement of discharge by the ultrasonic transit time (time of flight) method >
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BS EN ISO 6416:2017 Hydrometry. Measurement of discharge by the ultrasonic transit time (time of flight) method, 2018
- undefined
- European foreword
- Endorsement notice
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Applications
- 4.1 Types of applications
- 4.2 Attributes and limitations
- 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
- 6.2.1 General
- 6.2.2 Speed of sound in water
- 6.2.3 Propagation losses
- 6.2.4 Signal path bending
- 6.2.5 Reflection
- 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 Wireless systems (if a cable crossing is not possible)
- 7.8 Systems using divided cross-sections
- 7.9 Sloping paths
- 8 Determination of discharge
- 8.1 Single-path systems
- 8.2 Multi-path systems
- 8.2.1 General
- 8.2.2 Mid-section method
- 8.2.3 Mean-section method
- 8.3 Systems with transducers in the channel
- 9 System verification and calibration
- 10 Site selection
- 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
- 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 Determination of mean bed level
- 12.6 Channel width
- 13 Gauging station equipment
- 13.1 General
- 13.2 Design and construction of equipment
- 13.2.1 Transducers
- 13.2.2 Transducer cables
- 13.3 Reflectors
- 13.4 Civil engineering works
- 13.5 Signal timing and processing
- 13.5.1 General
- 13.5.2 Signal-to-noise ratio
- 13.5.3 Signal maintenance (gain control)
- 13.5.4 Signal detection
- 13.5.5 Post-detection filtering
- 13.6 System self-checking
- 13.7 Site-specific data (or site parameters)
- 13.8 Clock and calendar
- 13.9 System performance criteria
- 13.9.1 General
- 13.9.2 Operating environment
- 13.9.3 Water environment
- 13.9.4 Mechanical environment
- 13.9.5 Extreme environmental conditions
- 13.9.6 Power source
- 13.9.7 Measurement uncertainty
- 13.10 System output
- 13.10.1 Local display
- 13.10.2 Local record
- 13.10.3 Remote record
- 13.10.4 Diagnostic information
- 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
- 14.3.1 Uncertainty equation
- 14.3.2 Effective number of paths
- 14.3.3 Uncertainty in the line velocity, Ulv
- 14.3.4 Uncertainty in the channel width estimation, Uw
- 14.3.5 Examples of uncertainty estimation
- 14.3.6 Uncertainty estimate at low flow
- 14.3.7 Uncertainty estimate at high flow
- Annex A (informative) Principle of measurement uncertainty
- Annex B (informative) Performance guide for hydrometric equipment for use in technical standard examples
- Bibliography [Go to Page]