Maglionico, M and Casadio, A and Bolognesi, A and Archetti, R (2011) Development of flood probability charts for urban drainage network in coastal areas through a simplified joint assessment approach. Hydrology and Earth System Sciences.

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Abstract

The operating conditions of urban drainage net- works during storm events depend on the hydraulic convey- ing capacity of conduits and also on downstream boundary conditions. This is particularly true in coastal areas where the level of the receiving water body is directly or indirectly affected by tidal or wave effects. In such cases, not just dif- ferent rainfall conditions (varying intensity and duration), but also different sea-levels and their effects on the network op- eration should be considered. This paper aims to study the behaviour of a seaside town storm sewer network, estimating the threshold condition for flooding and proposing a simpli- fied method to assess the urban flooding severity as a func- tion of climate variables. The case study is a portion of the drainage system of Rimini (Italy), implemented and numer- ically modelled by means of InfoWorks CS code. The hy- draulic simulation of the sewerage system identified the per- centage of nodes of the drainage system where flooding is expected to occur. Combining these percentages with both climate variables’ values has lead to the definition of charts representing the combined degree of risk “rainfall-sea level” for the drainage system under investigation. A final com- parison between such charts and the results obtained from a one-year rainfall-sea level time series has demonstrated the reliability of the analysis.

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