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For calculating the evaporation rate over a reservoir surface E = 0.771 (1.465 - 0.00732 B) (0.44 - 0.007375 V) (pe - pa), the equation is given by

Roohwer's, formula in M.K.S.
Roohwer's formula in F.P.S.
Dalton's formula in F.P.S.
Dalton's formula in M.K.S.

Correct Answer: Roohwer's, formula in M.K.S.

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