Abstract
The characterization of stormwater runoff on urbanized surfaces by means of comparison between experimental data and simulations is a strict requirement for a sustainable management of urban sewer systems. A monitoring campaign was carried out within a residential area in Puglia (Southern Italy) in order to collect and evaluate quantity and quality data. A strong correlation was observed between COD (Chemical Oxygen Demand) and TSS (Total Suspended Solid) concentrations, whose values exceed water quality standards. TSS was used for calibration of Storm Water Management Model (SWMM) which was then validated with reference to the pollutograph’s shape and the peak-time. The first flush phenomenon occurrence was also investigated by looking at the distribution of pollutant mass vs. volume in stormwater discharges, using the so-called “M(V) curves”. Results show that on average the first 30% of that washed off carries 60% of TSS and provides important information for the design of efficient systems for first flush treatment.
Highlights
Urban drainage is one of the most important issues for sustainable use of the environment in heavily anthropized areas [1]
The comparison between the flow rates simulated by the Storm Water Management Model (SWMM) model and flow rates measured at the drainage system’s outlet for the three monitored events provided unexpected results after the calibration/validation procedure
Between 2006 and 2007, a monitoring campaign in the urban basin of Sannicandro di Bari was conducted with the aim of increasing the availability of experimental data on the quality of stormwater runoff
Summary
Urban drainage is one of the most important issues for sustainable use of the environment in heavily anthropized areas [1]. Runoff on urban surfaces carries into drainage systems pollutants including mainly settleable solids (organic and/or inorganic), nutrients, bacteria, oil, grease and heavy metals (Cu, Zn, Cd, etc.), in concentrations depending on land use. This contaminated flow rate if delivered, without treatment, through the drainage system outlet can be one of the major causes of quality deterioration of streams. Based on these considerations, several researchers have studied the “first flush” phenomenon (e.g., [2,3,4,5])
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