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The average pan coefficient of the standard USWB class A pan evaporimeter used for evaporation is
- A0.85
- B0.70
- C0.90
- D1.00
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In order to convert pan evaporation value into lake evaporation value a pan coefficient is used.
Lake evaporation = Pan Coefficient (Cp) × Pan Evaporation
Sl. No.
Types of pan
Pan Coef.
Range
1
USWB Class A Evaporation Pan
0.70
0.60 - 0.80
2
ISI Pan (Modified Class A)
0.80
0.65 - 1.10
3
Colorado Sunken Pan
0.78
0.75 - 0.86
4
USGS Floating Pan
0.80
0.70 - 0.82
Lake evaporation = Pan Coefficient (Cp) × Pan Evaporation
Sl. No.
Types of pan
Pan Coef.
Range
1
USWB Class A Evaporation Pan
0.70
0.60 - 0.80
2
ISI Pan (Modified Class A)
0.80
0.65 - 1.10
3
Colorado Sunken Pan
0.78
0.75 - 0.86
4
USGS Floating Pan
0.80
0.70 - 0.82