In this study, experimentation and hydrologic modeling of rainfall events transformed into runoff in natural forest systems, are investigated, including the following treatments: construction of an iterative optimization computational algorithm to identify the average unity hydrograph (rain-discharge transfer function) of the watershed, and to compute the effective rainfalls adequate to each discharge-rainfall event; applying the methodology to the Igarapé Bolívia watershed, which is located inside the Adolpho Ducke Forest Reserve; analysis and interpretation of the established algorithm, focusing on its convergence and on the significance of the results of this optimization process; and comparison with other studies in small watersheds of Central Amazonia. Rainfall and runoff measurements were made from July 2004 to September 2006, including the preparation phase of the level-discharge curve of the Igarapé Bolívia and the making of a large and diversified set of rainfall and runoff events.
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