Economic value of supplementary water in Brazilian crops: an application of a multisector growth model Despite its large reserves of fresh water, Brazil has a high concentration of these hydrological resource in the north region, which makes it relative scarce for attaining various demands such as irrigation, human and industrial uses. In the country, as it is the case in many other places in the world, proposals and implementations of water charge policies have been discussed, and those inevitably depend on resource's economic valuations. Therefore, this thesis aimed to estimate the economic value of water in Brazilian irrigate crops by using a multisector growth model with endogenous savings, that also included regional disaggregation. The model was calibrated for the year 2005 through a social accounting matrix with explicit water remuneration, and a growth accounting exercise. The results are the monetary values for two different concepts were obtained: shadow-rent and shadow-price. The first one can be directly associated to current values in water charging policies in Brazil, while the second one is related to the estimations of all the water used in the base year, and is theoretically linked to physical capital stock dynamics, which justifies the use of the proposed methodology. Specifically, the highest values in both shadow-rent and shadow-price concepts were found in the aggregated sector "other crops", i.e., crops other than rice and sugar cane, in middle-south region of Brazil, thus comprising a large part of the modern agricultural frontier. Meanwhile, small values were found for sugar cane production, also in center-south region, the biggest user of water in the country, due to agronomical and institutional aspects of the sector, such as the desirability of water restrictions during plant development and the large supply of water from stillage that, for legal reasons, is applied to the crops. Additionally, referent to the regional approach, the results suggest that water charging policies could adopt the economic activity as parameter to establish the charged value. In terms of water stock value, the largest share of it comprises rice and other crops, while sugarcane is responsible for a lower share of total value.