Civil Engineering MCQAE Level Civil Engineering
The pan coefficient used to convert Class A pan evaporation data to lake evaporation is approximately:
HydrologyPan Evaporation CoefficientMEDIUM
Choose the correct answer
A
1.2 to 1.5
B
0.6 to 0.8
C
0.3 to 0.5
D
1.0 exactly
Correct Answer
B. 0.6 to 0.8
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Pan coefficient Kp = Lake evaporation / Pan evaporation. Class A pan evaporation is higher than actual lake evaporation because the pan heats up more rapidly. Kp = 0.6 to 0.8 (average 0.7). Monthly values vary (0.6 in dry months, 0.8 in humid). Kp depends on site exposure, wind, humidity.
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