APPLICATION OF PROBABILISTIC ANALYTICAL METHOD FOR PLANNING DETENTION RESERVOIRS

Application of probabilist analytical method for planning detention reservoirs

Abstract

The present work has the objective of presenting a rapid calculation methodology for the pre-dimensioning of storage reservoirs of the drainage water for urban macro drainage planning. The Probabilistic Analytical Model, methodology used, is based on the exponential distributions of probabilities of the total volume, duration, intensity and times of rainfall events. Starting from these premises, the calculation of the necessary parameters for its application is carried out in a simple and fast way through formulas obtained by the equations of the probability theory. This model presents a very simple mathematical tool, reducing the computational time, besides offering the possibility of expedited simulations, using the hydrological parameters of the region under study, requiring only a small historical series of rainfall data, without the need of surveying the fluvial-morphological information of the basins. This method would be used in the urban planning and / or planning phase of the macro drainage system, since it is a method developed for a mixed urban drainage system. The methodology was applied to the Anhumas creek in Campinas, a very urbanized urban basin, whose results were excellent. The volumes thus determined made it possible to determine the potential sites to be implemented, due to the minimum area and volume requirements, without the need to collect other information, which is necessary for the preparation of a basic or executive project, used in the urban drainage planning phase.