Abstract
Estimation of evaporation from Lake Nojiri, which has an average depth of 21m, was made by means of the aerodynamic method as well as the heat budget method. Nearly same results were obtained independently by the two methods. Evaporation is found to be greater in August-September and less in February-April. A comparison was made between the seasonal change in evaporation from Lake Nojiri and that from Lake Towada which is deeper than the former lake. The conclusion reached is that when the lake is deeper, maximum or minimum evaporation occurs later due to the delaying effect of the heat energy stored in the lake.
