In the Amazon region, hydrological transportation has historically played a crucial role.
However, passenger water transportation lacks economic models that assist in the design and
implementation of strategies for its viability. In this study, a cost model for passenger water
transportation was developed based on activity-based costing principles and linear
programming. The aim was to optimize costs and maximize profits, considering demand and
service level constraints in a water transportation company in the city of Belém, Brazil. The
model was applied to three crossings that operate passenger, cargo, and vehicle trips between
Belém and Ilha de Marajó. Various simulations were conducted to explore opportunities and
conditions for reducing operational costs. The objective was to find the best cost-profit
relationship, with the model parameters including variable costs, profits, and the maximum
number of possible trips. Based on the results, alternative cost reduction strategies were
established to achieve maximum profit and the highest number of trips. The model proved to
be useful through the analysis of viable and effective cost reduction strategies
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