Assessment of the hydrological response of an urban watershed to rainfall-runoff events in different land use scenarios - Belo Horizonte, MG, Brazil.

摘要: Intense urbanization results in greater soil sealing and a consequent increase surface runoff. When high rates slopes are encountered small catchments, volume short duration precipitation events the probability of flash floods. This study evaluates hydrological response an urban catchment with regard to rainfall-runoff following scenarios: current land use, without detention basin which has been part system since 1970s, maximum allowed by legislation, green infrastructure implantation 100%, 50% 10% suitable area. Hydrological modelling was performed using Storm Water Management Model (SWMM). Six level gauges installed along length stream provided data used model calibration validation. The process adequate results: average Nash-Sutcliffe coefficient 0.72, mean error peak flow 11% runoff 12%. Rainfall based on 2-, 10-, 50- 100-year were simulated for each scenario, as well two observed events. In scenario basin, elevation outlet. sealing, outlet increased 30% average. On other hand, implementation available areas, reduced 60%, 5%, respectively. Results indicated efficiency reduce flooding, importance area preservation flows, potential benefits that they can provide, increasing infiltration reducing flow.