Dimensionamento e acompanhamento executivo de uma barragem de terra para irrigação - um estudo de caso

Abstract

In many parts of the world, derivate financial benefits of cultivating the land are rarely enough to allow the construction of concrete structures, which are considerably more expensive and technologically advanced, for the water storage, therefore, it becomes viable the construction of earth dam or weir simple. The storage capacity of the reservoir should be greater than the demand during the cycle of a crop. There are several objectives for the construction of a dam in addition to irrigation crops, among them are: water supply, navigation, hydroelectric and others. The ultimate goal of a dam is its construction respecting the minimum safety limits for the maintenance of this in its place of origin, noting that any problems that may occur in its massive, all set downstream of it will be greatly affected with enormous environmental and social impacts. Given this context, it is reported in this paper the design of all hydraulic components of an earth dam on the property of Decius Prates da Silveira, in the municipality of Quaraí-RS, making the use of these values found for simulation of it in Slide software, which allows from the dam context delimit the failure surface of the downstream slope and amount, making the verification of the safety factor of each slope. The practical monitoring of the dam execution was checked and set up a photographic collection on it. The volume of water found is sufficient for irrigation of 63.06 hectares on the property. As a result, it was determined total height of the dam of 12.6 meters, and the normal level of water in it is 11 meters and the maximum level is 11.4 meters, the difference is given by the weir height 0.4 meters, with a safety edge 1.2 meters. The width of the comb was found 5 meters, which allows the passage of vehicles and animals. Against the slope safety factor for various simulations they had values above their limit, based on a minimum value of 1.5, thus obeying the limit.