Analysis of risk associated to the urban runoff. Case study: City of Mendoza, Argentina
Analysis of risk associated to the urban runoff. Case study: City of Mendoza, Argentina
Nanía, Leonardo and Gómez, Manuel and Dolz, José
Global Solutions for Urban Drainage 2002
Abstract : This paper is focussed on the analysis of the risk associated to the urban runoff on streets. Due to the lack of specific criteria to evaluate the urban storm runoffs risk, Témez’s criterion, Abt’s criterion and Denver Flood Control District’s criterion adapted to the City of Mendoza were analyzed. Two new criteria based in theoretical analysis of the water’s force acting on a static pedestrian are presented: no slipping criterion and stability to tilt criterion. According to these basis, some relations between depths and velocities should be fulfilled in order to guarantee the pedestrian’s and driver’s security in the case of medium to hard storms. A one-dimensional numerical model, after Nanía (1999), is used to solve and analyze the urban storm runoff in a street network. This approach is applied to an urban watershed of the city of Mendoza (Argentina), obtaining the runoff values belonging to return periods of 5, 10 and 25 years. The results are evaluated bearing in mind the former risk’s criteria. As a conclusion, the numerical model is a useful tool in order to the application of the risk’s criteria, since a temporal evolution of the depths and velocities can be obtained. The model can be applied to an extensive urban area in which the street network fulfils the basic hypotheses.
