Perdas de água por evaporação e arraste na irrigação por aspersão no município de Lavras-MG.

Abstract

As water has become more scarce and expensive, the importance of strategies that allow a more efficient use of the water discharged by sprinkler systems also increases. The models developed by Frost & Schwalen and Yazar were used to simulate and compare, in different periods of the day, evaporation and drift losses from the water discharged by sprinkler irrigation. A software, written in Object Pascal (Delphi 6.0 graphic environment), was developed to carry out these simulations, considering a sprinkler with a 5.2 mm nozzle operating at pressures of 20 and 30 m, under the climatic conditions observed in Lavras – MG during the 2004 year. Under the climatic conditions in which the simulations were carried out, it was possible to conclude that the losses, for both models used, were lower during the night period than during the daytime period. Evaporation and drift losses ranged from 0.41 to 2.54% for the Frost & Schwalen model and from 0.08 to 2.68% for the Yazar model.