Use Rainfall Runoff Model as an Important Tool to Optimize Investments in Flood Control in a Megacity: São Paulo, Brazil

This paper aims to show the use of rainfall runoff modeling as an important methodology to optimize investments for flood control in the city of São Paulo. The city of São Paulo is the largest city in Brazil and one of the five largest cities in the world. However, this megacity has a chronic flood problem that occurs every year, especially during the summer. This huge problem affects millions of people generating great economic and social damages. Due to its limited budget, the investments in flood control must be as effective as possible to bring benefits to the maximum number of people. In this sense, a methodology was developed for the diagnosis, evaluation, and classification of each available works for flood control. The rainfall runoff model SWMM was the fundamental tool for these analyses. The use of the model allowed evaluating different scenarios with different flood control works and in this way, it was possible to build different alternatives to solve the flood impacts in the basin. Each alternative had its impacts evaluated, as well as costs and number of people affected. As a result, this methodology consists in an important tool for planning and management of small urban catchments. To illustrate this methodology, this paper shows its application in the Jaguare Basin located in the west area of São Paulo City.

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