Evaporation from Lake Michie, North Carolina 1961-71
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Abstract
The Geological Survey, in cooperation with the city of Durham, N. C., collected evaporation data at Lake Michie, Durham's 480-acre water-supply reservoir, for 10 consecutive years from September 1961 to September 1971. Wind speed, air temperature, and water temperature-collected continuously-were used in conjunction with water-budget data to calibrate the semi-empirical mass-transfer equation, E Nu(eo - ea), where E is evaporation; N is the mass-transfer coefficient, which is a constant for a given lake; u is wind speed; eo is the vapor pressure of the saturated air at the water surface; and ea is the vapor pressure of the surrounding air. For evaporation expressed in inches, the mass-transfer coefficient for Lake Michie is 0.0036.
During the study period the average annual evaporation from Lake Michie was 37.9 inches. Within-year variation of evaporation from the lake is sinusoidal, with a high during July averaging 4.71 inches and a low during January averaging 1.45 inches.
Evaporation from Lake Michie was 0.72 (or about three-quarters) of the evaporation from the National Weather Service evaporation pan at Chapel Hill. This ratio, called a pan coefficient, was not constant throughout the year, ranging from an average of 0.57 for April to 1.09 for December.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Evaporation from Lake Michie, North Carolina 1961-71 |
| Series title | Water-Resources Investigations Report |
| Series number | 73-38 |
| DOI | 10.3133/wri7338 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | South Atlantic Water Science Center |
| Description | iv, 27 p. |
| Country | United States |
| State | North Carolina |
| Other Geospatial | Lake Michie |
| Google Analytic Metrics | Metrics page |