Over the years, ASI has developed the dye-dilution technique
for flow rate verification. Dye-dilution testing is a detailed procedure that combines field, laboratory and analytical procedures to compute flow rate based on the dilution of a fluorescent dye at non-visible concentrations.
ASI has developed an in-house software program called ASI Dye-Dilution (ASIDD) to streamline data collection and processing during dye-dilution testing. ASIDD provides a means for data to be simultaneously collected, graphed, and reviewed. The software also allows for real-time test troubleshooting, repeatable and consistent analysis methods, and test error analysis.
ASIDD is used to calculate flow rate through a sewer reach during a discrete time interval which is compared to flow rate determined from a meter, pump curves, wet well drawdown times, or other flow rate measurement technique. This comparison is used to determine an adjustment factor which is generated in ASIDD which can easily be tracked over the lifespan of the flow measuring instrument.