In determining the water balance and water use efficiency of lawn using weighing lysimeter, two grass-covered lysimeters irrigated with different water inputs, to model deficit and sufficient irrigation were set up. Findings showed that both lawns transpirated almost the same amount of water with a slightly positive water balance. More intensively irrigated lawn resulted in higher biomass production and water use efficiency, thus proved to be a bit more favourable, in comparing sufficient to deficit irrigation. Therefore, to achieve a nice lawn, it necessitates to irrigate, even in the rainy season, partly for the survival of the dry periods, and to achieve a higher biomass production.