Abstract
Here we present field experiment results and its examination to evaluate the performance of air lifting towers installed in Yamaguci Regulating Reservoir in Fukuoka. In the experiment, 4 air lifting towers with different size combination of diameter and length were used, and water flow velocity was measured at their bottom intakes and around water surface where their bubble plum es emitted from outlet rise up. From these data, quantity of water flowing to the bottom intakes and rising up to reservoir s urface was estimated. Finally, their data were compared with ones obtained by the prediction formula Asaeda et al. indicated, and it was found that they generally coincide with each other..
