Molina states that the construction of reservoirs responds more to a political decision than to a technical one, which brings together the interests of the nation with a ''patriotic'' content regarding ''well-being'' and ''national development'' with the region's objectives where they are projected. For his analysis he takes the case of the Arroyo Tambor community and divides its scenario in three dimensions; l) the level of responsible institutions, 2) in the area affected locally and regionally, and 3) an intermediate one where all sorts of negotiations take place.