Distributed vs. concentrated storage options for controlling CSO volumes and pollutant loads

The Best Management Practices (BMPs), the volume control and pollutant mass removal operated with a stormwater tanks are investigated in the present work. Data collected in 2007 during two monitoring campaigns was used to this aim. During the first monitoring campaign were observed six rainfall-runoff events, and was collected hydrological and quality data that were used to calibrate and to validate the SWMM (Storm Water Management Model – by USEPA) parameters. Ten rainfall-runoff events were observed during the second monitoring campaign, and the data were used to simulate, with SWMM, five different scenarios. Each scenario was characterized by a different tanks distribution on urban catchment surface. The results was analyzed in terms of overflow volume and overall pollutant mass in the receiving water body. The results obtained indicated a good efficiency of CSO volume control and pollutant mass removal for the scenarios characterized by multiple storage tanks implemented at specific locations.