RBSA II Updated GPM Flow Rate Calibration

Cadmus used two different techniques to measure fixture flow rates for the RBSA II study: a flow bag and a flow microweir. Technicians did not record which method was used at the time of data collection. The study results for water flow rate were higher than those recorded in the RBSA I study, raising understandable concerns about market trends and data reliability. To address these concerns and appropriately calibrate RBSA II results, Cadmus took these actions:

• Tested the accuracy of the two measurement methods (flow bag and microweir) and developed calibration factors for each method
• Contacted the field technicians who collected the RBSA II data to determine faucets and shower heads for which Cadmus could identify the measurement method with a high level of certainty

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