Hydrology of Crater, East and Davis Lakes, Oregon by Kenneth N. Phillips
WATER LOSS FROM THE LAKE
The difference between overall water supply and seepage loss, adjusted as necessary for change in lake volume, is ascribed to evaporation. In table 6, the annual evaporation loss is computed as 23 inches, both for the complete period of precipitation records, 1930-62, and for the year ending September 30, 1962. Although for any given year or short period of years the evaporation loss may be more or less than 23 inches, for simplicity that rate is used for all computations in this report. The computed loss of 23 inches per year is in the same order of magnitude as losses based on empirical seasonal data for nearby Odell Lake, and somewhat less than that for the more remote Lake Tahoe; it is 10 inches less than the average annual lake evaporation in the area, not adjusted for altitude (Kohler and others, 1959, pl. 2).
|TABLE 6.-Computation of annual evaporation loss from Crater Lake|