The survey covers constructive and accessible methods and techniques, called Fibrobarro, directed at rural communities. These use materials found in nature and ways of doing that are not from the region, following the empirical methodology, translated into new concepts of participatory design, which determines experiences influencing social relations and education work of these communities. The set of methods and techniques discussed helped in the development of an organic waterbox, serving as an alternative to the current development model, in which unrestrained consumption of non-renewable resources proved to be unviable in terms of sustainability in the process and use. In the last 20 years, the LILD studied clean technologies of low ambient impact and the use of regional materials, taking care of the real demands in the object construction of design and architecture working with composite materials of raw land and natural staple fibers. Details about these techniques and composites developed in laboratory and fields models are observed and studied in the course of research, and also examples of constructions made in the rural community. The Fibrobarro was used in experiments, and he composed of clay added to fibers combined with each other. This composite, when dry polyurethane resin was waterproofed with Vegetable, extracted from castor oil. Both during the tests and in the development of reduced models, some possibilities of combinations had been verified between the fibers along the clay in order to verify the strength, durability and water-resistance of the new composites drawn from the tests, the application of the material in the appropriate construction of the waterbox tank as well as fences and architectural coatings. The survey presents the result of the process of developing an object constructed with these composites, applying the methodology used in the project, with the aim of leveraging LILD rainwater.