This work presents the implementation, in Python, of the model proposed by São Mateus et al. (2012) for calculating the water balance in landfills located in tropical climate regions and developing countries, as well as its compilation for Windows and Linux platforms. Waterfill is a free application, freely distributed for non-commercial purposes and available for download. The system features a simple and intuitive interface for data entry and visualization, incorporating control mechanisms that reduce the occurrence of data input errors. The application is intended for professionals, researchers, and environmental management agencies that frequently lack specific, accessible, and reliable tools for performing this type of analysis.
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