This study is focused on the urban impact on the Seveso watershed. the main goal is to quantify the effect of urbanization on the generation of stormwater runoff. Accordingly, the runoff is evaluated based on the SCS-CN method. To do this, a time series of 6-year precipitation data was analyzed, and runoff generation was investigated as a function of land cover and soil type. The results show that the highest runoff volume contribution (more than 70%) corresponds to industrial and commercial areas. This can substantially increase the flood risk and cause severe damage. Moreover, the impact of stormwater runoff on the Seveso river water quality was investigated. Interestingly, substantial increases in concentrations possibly related to runoff were observed for some micropollutants. To be more specific, Glyphosate showed the highest increase. Finally, some stormwater control measures are considered for the Seveso watershed: the traditional approach of the retention tanks (hydraulic invariance application) and compared to Sustainable Urban Drainage System (SUDS) solutions. Retention tanks were found to be insufficient for controlling the generated runoff volume over the Seveso watershed. Moreover, has several environmental negative aspects. Concerning SUDS, two common solutions were considered: green roofs and permeable pavements. The results illustrate the significant decrease in runoff values (more than 30%) which can be obtained through the combined application of these two systems. The cost-benefit analysis is also applied for both retention tanks and SUDS; it is observed that the retention tanks can be the most cost-efficient solution. Nonetheless, permeable pavements and a combined system can be appropriate solutions as well providing also additional benefits and avoiding some environmental impacts of the tanks.
Questo studio è focalizzato sull'impatto urbano sullo spartiacque di Seveso. l'obiettivo principale è quantificare l'effetto dell'urbanizzazione sulla generazione del deflusso delle acque piovane. Di conseguenza, il deflusso viene valutato in base al metodo SCS-CN. .per fare ciò, è stata analizzata una serie temporale di dati sulle precipitazioni a 6 anni ed è stata studiata la generazione del deflusso in funzione della copertura del suolo e del tipo di suolo. I risultati mostrano che il maggior contributo al volume di deflusso (oltre il 70%) corrisponde alle aree industriali e commerciali. .ciò può aumentare notevolmente il rischio di alluvione e causare gravi danni. Inoltre, è stato studiato l'impatto del deflusso delle acque piovane sulla qualità dell'acqua del fiume Seveso. È interessante notare che per alcuni microinquinanti sono stati osservati aumenti sostanziali delle concentrazioni possibilmente correlate al deflusso. .per essere più specifici, il glifosato ha mostrato l'aumento più elevato. Infine, per lo spartiacque di Seveso vengono prese in considerazione alcune misure di controllo delle acque piovane: l'approccio tradizionale delle vasche di ritenzione (applicazione dell'invarianza idraulica) e il confronto con le soluzioni del Sistema di Drenaggio Urbano Sostenibile (SUDS). .le vasche di ritenzione sono risultate insufficienti per il controllo del volume di deflusso generato sullo spartiacque di Seveso. Inoltre, ha diversi aspetti negativi ambientali. Per quanto riguarda SUDS, sono state considerate due soluzioni comuni: tetti verdi e pavimentazioni permeabili. .i risultati illustrano la significativa diminuzione dei valori di deflusso (oltre il 30%) ottenibile attraverso l'applicazione combinata di questi due sistemi. .l'analisi costi-benefici si applica anche sia alle vasche di ritenzione che ai SUDS; si osserva che i serbatoi di ritenzione possono essere la soluzione più conveniente. .tuttavia, pavimentazioni permeabili e un sistema combinato possono essere soluzioni appropriate oltre a fornire anche ulteriori vantaggi ed evitare alcuni impatti ambientali dei serbatoi.
Impact of urban runoff on Seveso watershed
FARHANGI, MOHAMMADHOSSEIN
2020/2021
Abstract
This study is focused on the urban impact on the Seveso watershed. the main goal is to quantify the effect of urbanization on the generation of stormwater runoff. Accordingly, the runoff is evaluated based on the SCS-CN method. To do this, a time series of 6-year precipitation data was analyzed, and runoff generation was investigated as a function of land cover and soil type. The results show that the highest runoff volume contribution (more than 70%) corresponds to industrial and commercial areas. This can substantially increase the flood risk and cause severe damage. Moreover, the impact of stormwater runoff on the Seveso river water quality was investigated. Interestingly, substantial increases in concentrations possibly related to runoff were observed for some micropollutants. To be more specific, Glyphosate showed the highest increase. Finally, some stormwater control measures are considered for the Seveso watershed: the traditional approach of the retention tanks (hydraulic invariance application) and compared to Sustainable Urban Drainage System (SUDS) solutions. Retention tanks were found to be insufficient for controlling the generated runoff volume over the Seveso watershed. Moreover, has several environmental negative aspects. Concerning SUDS, two common solutions were considered: green roofs and permeable pavements. The results illustrate the significant decrease in runoff values (more than 30%) which can be obtained through the combined application of these two systems. The cost-benefit analysis is also applied for both retention tanks and SUDS; it is observed that the retention tanks can be the most cost-efficient solution. Nonetheless, permeable pavements and a combined system can be appropriate solutions as well providing also additional benefits and avoiding some environmental impacts of the tanks.| File | Dimensione | Formato | |
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https://hdl.handle.net/10589/186815