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Lake Colorado City, a reservoir in north-central Texas, is used as a source of cooling water for a thermal-electric powernlant. Evaporation from the lake was determined by the energy-budget method for the period July 1954 to October 1955. Annual evaporation from Lake Colorado City was 93 inches, of 'vhich 85 inches was natural evaporation and 8 inches resulted 'Tom addition of heat to the lake by the powerplant. Analyses indicate that if no heat had been added by the nowerplant, the water-surface temperature would have been only 0.8° C lower than that observed. The temperature rise is almost directly proportional to the heat input, so that doubling 'he quantity of heat added by the powerplant would raise the ' emperature an additional 0.8° C, if the volume of water in the •••^servoir was the same as in 1954-55. The temperature rise in ". nearly empty reservoir, of course, would be much greater, and "n a full reservoir, less. The increase in evaporation from Lake Colorado City, when expressed as a volume, is directly proportional to the amount of heat added and is practically independent of reservoir con'ents. During 1954-55 the volume of forced evaporation rerulting from the heat added by the powerplant, 910 acre-feet, "TTas almost exactly the same as the volume of water diverted to Colorado City for municipal purposes. The entire lake is being effectively utilized in disposing of heat, '^ater temperatures in the lower basin of the lake were higher :: n winter than those in the upper basin of the lake; no appreciable r'ifferences were observed in summer. Density differences be''ween the two parts of the lake were very small at all times. A comparison between average lake temperatures (as determined from the thermal surveys) and plant intake water temperatures indicates that water is withdrawn from all levels of the lake above the pump intakes. The average withdrawal temperature to be expected, if the amount of heat added by the powerplant is increased, probably will be about equal to the rnticipated surface temperature, which can be determined from

The effect of the addition of heat from a powerplant on the thermal structure and evaporation of Lake Colorado City, Texas