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Between the preservation of aquatic ecosystems and the demand for water collection from rivers, complex problems arise for water resource management. To enable the continuity of the ecological functions offered by the water, a flow that sustains the aquatic ecosystem has to be maintained. This study aims to compare different methods of ecological flow calculation and their applicability in an urbanised watershed, discussing the resulting environmental and social implications in the context of a developing country. The 7Q10, Northern Great Plains Resource Program, and Ecological Hydraulic Radius approaches were used. The 7Q10 was chosen because it is a method widely used in Brazil and the others for their ecological considerations and the availability of data for the study area. The results showed that the daily flow crossing the rivers of the urban watershed is not enough to promote the maintenance of the aquatic ecosystem. The 7Q10 method presented an admissible ecological flow (0.38 m 3 /s) due to the absence of ecological parameters in the modelling and this differed from the other approaches. We highlight the need to develop an ecologically sustainable water management program for the recovery and revitalisation of the waterways in the basin.

Hydraulic-hydrological modelling for ecological flow analysis in urbanised basins without monitored flow data