The influence of anthropization over flow in a middle Italian basin. Different scenarios.

The modifications applied in our country by human activities over natural environments in the last decades, starting from the second world war, have a relevant impact on the hydrology answers of the system. Specifically the effects of anthropization are more intense around cities, where agricultural soils, which have an high infiltration index, have been modified into urban areas which are almost impermeable. This phenomena generates different answer of the basins to the same input event in terms of peak discharge and volume and in term of water recharge of the deep aquifer. The percentage change of the soil use determines a different ground water capacity, that means higher peak in downstream, and less ground water storage. This generate a depletion in base-flow, which can cause environmental problems, and an impoverishment of the water system. The study of this problem with a GIS program to change some parameters and to simulate different scenarios of anthropization can give indication for a future planning over water resource. The goal of the study is to improve the knowledge of the hydraulic changes occurred over years of uncontrolled urbanization, the impact that this change have on natural environment and the strategy that should be used in the future for a better management of water asset in order to prevent extreme events, as stream-flow or long dry period.