Principles of Dye Dilution
Dye dilution is a generic term that
is based on the principles of fluorimetry. The combination of a fluorometer
and fluorescent dyes forms a tracer system that is the basis of dye dilution
investigations. Dye dilution methods involve the injection of a fluorescent
dye tracer (typically Rhodamine WT) into a receiving body of water and measurement
of fluorescence at a location further downstream. Flow rate at the downstream station
can be determined by a mass balance which reduces to the ratio of concentrations
of the injected and recovered tracer multiplied by the injection rate.
Dye dilution flow rate measurements are typically accurate to ± 2%. Our proven procedures use a
modified verion of the ISO standard 9555-1:1994
Typical Dye Dilution Applications
- Calibrate flow meters, weirs and flumes in-situ.
- Develop rating curves for natural streams.
- Determine the efficiency of inverted siphons.
- Measure stream and conduit flow.
- Lift station / pump curve calibration.
- Hydraulic turbine performance testing.
- Determine inflow and infiltration.
- Determine actual residence times in sedimentation and chlorine contact tanks.
- Determine effluent outfall plume propagation.
Services We offer.
Our staff have over fifteen years of dye dilution,
flow meter installation, calibration and maintenance experience. We offer expert technical assitance in:
- In-situ flow meter calibration/verification by dye dilution or other techniques.
- Training programs and consulting on dye dilution and flow monitoring techniques.
- Flow meter audits - meter type, age, location, suitability for calibration, data management.
- Calibration of secondary instrumentation.
- Development of a meter calibration and replacement strategy.