The dissertation addresses the need to monitor the quantitative water balance in the Rio
Capim Watershed (BHRC), Pará, Brazil, due to the variability of precipitation throughout the
year and water scarcity in some areas during dry periods. The general objective is to determine
the water availability of BHRC based on the regularization of water users (issued and active
water permits) as a subsidy for water resource management efficiency. To achieve this
objective, the study was conducted in five stages: literature review, data collection of granted
water interferences, organization of vector data for ottobasins and surface water availability
from the Ottocodified Hydrographic Database of Pará (BHO/PA), data processing, and
quantitative water balance assessment. Results revealed that certain municipalities have
significantly more granted water permits than others, such as Paragominas (29.5%), Dom
Eliseu (25%), and Ipixuna do Pará (17.5%), totaling 72% of all issued permits. Surface water
in BHRC is utilized for various purposes, with irrigation being predominant, accounting for 79%
of the total captured volume. Other significant uses include mineral extraction and industrial
purposes, totaling 18% of the captured volume. It was identified that 180 ottobasins are directly
impacted by granted water withdrawals, while 3,081 ottobasins are indirectly impacted
downstream, totaling 3,181 impacted ottobasins throughout the watershed. The Surubiju River
and its tributaries show the highest impact, with 89 directly impacted segments and a
withdrawal flow of 206,355.73 cubic meters per day. These findings underscore the need for
continuous and detailed monitoring to ensure water resource sustainability in BHRC and serve
as a critical tool for decision-making in water resource allocation in Pará State.
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