Continuous sewer hydraulic and pollutant concentration observations from 2008 to 2011 including precipitation data, laboratory analysis and a hydrodynamic model

This dataset compiles continuous hydraulic and water quality observations from the combined sewer overflow structure at the outlet of the Graz-West R05 catchment in Austria, covering the period from 2008 to 2011. It integrates high-resolution in-sewer measurements of flow rate, water level, flow velocity and water quality parameters (COD, TSS, temperature), complemented by laboratory analyses of discrete grab samples. Water quality parameters were monitored using an in-situ UV/VIS spectrometer installed on a floating pontoon. Additional locally calibrated COD values derived from laboratory measurements are included. The in-sewer data were acquired at 1- or 3-minute intervals depending on flow conditions. Flow rates, water levels and overflow discharges were monitored using radar and ultrasonic sensors. Three nearby tipping-bucket rain gauges provided time-stamped precipitation increments, enabling the detailed reconstruction of wet-weather dynamics. All recorded time series are stored in standardised CSV formats with ISO-conform timestamps, along with accompanying metadata that specifies instrumentation, units, data gaps, measurement principles and calibration states. A hydrodynamic SWMM model of the catchment, including geospatial information and dry-weather calibration, is included to support modelling applications.