Abstract
The problems arising from unplanned urbanization are due to the lack of urban development policies, such as master plans (RIBEIRO e ROOKE, 2010). The use of indicators constitutes an instrument of great importance for proper management of public affairs. For this, the three areas (PEs) were selected in the basin, quote: east, middle course and mouth of the river, for the application of indicators of environmental fragility of nature system. The basin was identified erosion, negative interactions of drainage systems with domestic wastewater, solid waste, among others. The General Indices Fragility (IGFs) were found 57, 49 and 72 respectively to the east, middle course and river estuary, featuring high grade fragility under the environmental aspect, ranging from strong to very strong. We conclude that the use of indicators of fragility is extremely importance to public administration, particularly as a tool for identifying intervening factors and fragility of urban stormwater drainage systems.
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