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This study deals with a set of methods for classifying land regarding its potential use in coop irrigation with low operational and investment costs applicable in regions with an irregular relief. The use of a Geographic Information System and Remote Sensing techniques together with soil data and classification, hydrological, agricultural and economic information, allowed the identification and classification of areas suitable for irrigation techniques based on gravity flow at the scarp of the Rio Grande do Sul Plateau, occupied by a large number of agricultural smallholdings. The model was applied to the Santa Cruz do Sul region in Rio Grande do Sul, Brazil, superposing thematic maps of water resources, soil production potentials, relief and native forest cover. In this 759 km2 area, comprising the municipality of Santa Cruz do Sul, an area totaling 512.45 km2 suitable for the use of irrigation techniques based on gravity flow, was identified; 9% of this area presents conditions for economically feasible irrigation projects with low investment costs. In two of them experimental tests were applied for production cost and benefit analysis, and information collected which allowed the determination of areas where irrigation is economically feasible. Key-words: Low-cost irrigation, rural smallholdings.

Análise Econômica de uma Alternativa de Baixo Custo para a Irrigação de Pequenas Propriedades em Regiões Acidentadas