RECARGA SUBTERRÂNEA EM BACIA TROPICAL COM AGROFLORESTA DE MATA ATLÂNTICA E CACAU
Abstract
In the Ilhéus region of Bahia, cocoa cultivation is carried out under the Cabruca Agroforestry System, in which cocoa plants are grown in the shade of the Atlantic Forest. Agricultural production in this system depends significantly on water availability; however, there is still a lack of detailed studies on groundwater recharge in the area. This work aims to estimate water recharge and baseflow in the Almada Basin, characterized by fractured and fissured aquifers. To this end, historical series of flow and precipitation between 1977 and 1994 were analyzed using the Rorabaugh, Eckhardt, and Martin methods. The recession index was determined via the Master Recession Curve, and baseflow was determined using digital filters. The results indicated that between 47% and 53% of the river's flow derives from groundwater reserves. Recharge rates ranged from 11% to 13% of annual rainfall, providing important input for water management policies and payments for environmental services in the cocoa-cabruca areas of the Atlantic Forest.
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