On-line equipment installed in a stormwater harvesting system: Calibration procedures, first performance results and applications

This paper presents the calibration procedures for the monitoring equipment of a constructedwetland/reservoir-tank (CWRT) used for SWH (stormwater harvesting) purposes. For the calibration of the water levels, instead of defining an explicit model that relates water flow and level, we developed a methodology that considers all the water level / flow rate pairs measured. For the calibration of on-line continuous water quality data vs. TSS laboratory reference concentrations, we used a methodology that employs SVM (Support Vector Machines) and uncertainty analysis. In terms of water quantity, we have analysed 12 months of recorded levels from June of 2014 to May of 2015 (157 storm rain events). Initials results show that during this period the CWRT handled flow peaks between 0.04 L/s and 50.6 L/s. In addition, outflow runoff peaks vary between 92% and 10% of those observed for inflow. In terms of water quality, we analysed the two longest recorded periods, for which the pollutant concentrations retention efficiencies range between 36% and 90%.