Hydrobiochemical modeling of the Saint-Charles watershed. 1: Hydrology

This paper presents the application of a hydrological model to the Saint-Ch arles watershed, using available data. River flows are simulated with the c onceptually based, distributed hydrological model CEQUEAU. River flows obta ined from the CEQUEAU model are used as input data for a biochemical modell ing study that is presented in a companion paper. The study was conducted i n order Co determine the usefulness of an integrated modelling approach for evaluation of a watershed hydro-biochemical condition. Reasonably good hyd rological results were obtained for the rural portion of the watershed. Due to the lack of available data in the non-rural subwatersheds, simulated ri ver flows did not replicate observed flows. In addition to the lack of avai lable data, these differences can be attributed to the influence of unconsi dered water management practices and an oversimplification of urban hydrolo gical processes.