as pdf

sfrc.ufl.edu

as pdf

Evaporation from a Pan

• Mass balance equation

S

I 0

• National Weather Service Class A type

• Installed on a wooden platform in a

grassy location

• Filled with water to within 2.5 inches of

the top

• Evaporation rate is measured by manual

readings or with an analog output

evaporation gauge

H


2

E


p

H

• Pans measure more

evaporation than natural

water bodies because:

1

P ( H

– 1) less heat storage capacity

(smaller volume)

– 2) heat transfer

– 3) wind effects

P E

2


H

1

)

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