The water, renewable resource, but finite, has been studied in many areas of knowledge, especially with regard to their availability on the surface. Other studies, however, are developed to identify how and how much is their participation in various stages of the hydrology cycle. Researchs that relates rain with the rain forest systems are examples of this. This paper aims to present the importance of determining the effective rainfall, and to study the influence of forest vegetation in the hydrological cycle in watersheds, as well as the present study that is being developed in the Floresta Nacional de Ipanema, in Iperó-SP. These studies collect information on understanding the distribution of water on vegetation in order to generate forms of management are technically feasible, facilitating the important decisions for the integrated use of watershed.
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