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A landscape is a portion of space resulting from the combination of physical, biological, and anthropic elements that interact and are constantly evolving. The landscape of the municipalities that are insert in the hydrographic basin of the Forqueta river, RS, most emancipated in the last twenty years, have been undergoing constant changes. The aim of the study was to determine how the land use and coverage in the basin had been evolved, and what were the main determining factors in this process over a period of 28 years. Images of the Sensor TM of the Landsat satellites 5 and 8 of September 1986, 1996 and 2006 and one image of October 2014 were used. For the delimitation of the hydrographic basin was used, the SRTM database (Shuttle Radar Topography Mission), and extracted the Forqueta river basin for each image of each year, and classified the land use. Along the 28 years, the agriculture area was gradually decreasing, reaching a percentage of 13.19% reduction in 2014, representing an area of approximately 18600 hectares. This is due to the new automated agriculture techniques, which make it impossible to plant with machinery on steeper terrain, with consequent abandonment of the areas, as well as, more recently, due to the intensification of environmental inspection. The field area also decreased by 66.49%, and occurred occupation of these areas by FOM and FED, and by forestry, the latter increased in the period 1233.92%, becoming the second source of income of the municipalities. [ABSTRACT FROM AUTHOR]

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