10.4122/1.1000001241 Ramier, D. Berthier, E. Andrieu, H. Study of the water budget of streets: experimentation and modelling DTU Library, Technical University of Denmark (DTU) 2005 Evaporation hydrology modelling infiltration runoff urban surfaces Laboratoire Central des Ponts et Chauss\303\251es, division Eau et Environnement Laboratoire R\303\251gional de l\342\200\231Ouest Parisien en Conference presentation 10.4122/1.1000001242 text/xml 1 The study of two stretches of street during 38 months allowed to analyze the hydrological behavior of streets during rain events. The results show that runoff coefficients are very variable and runoff losses may be important. In order to better understand this behavior, a physical based model is used. This model, BiL, combine a porous media flow module with a surface runoff module. The lateral runoff transfer in the lateral gutter is approximated by the Muskingum model. Evaporation is simulated by an adaptation of the Penman\342\200\231s method. A sensitivity study showed that the model is mainly sensitive to saturated hydraulic conductivity of the asphalt pavement and to the storage capacity. The comparison of simulated and observed data gives good results for the runoff outflow at a 3 minutes time step. On the other hand, the simulation results are less encouraging for the runoff coefficient. This study of the water budget of two street stretches during a period of 38 indicates that the infiltration and evaporation represent between 20 and 30 % of rain.