A reservoir of surface area 400 hectares has water temperature = 27°C, relative humidity = 40%, ea of water = 17.54 mm (Hg) and velocity of wind 2 m above the ground is 11 km/hr. Use Meyer’s formula to determine the daily evaporation from the reservoir in mm.a)17b)18Correct answer is between '17,18'. Can you explain this answer?

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A reservoir of surface area 400 hectares has water temperature = 27°C, relative humidity = 40%, ea of water = 17.54 mm (Hg) and velocity of wind 2 m above the ground is 11 km/hr. Use Meyer’s formula to determine the daily evaporation from the reservoir in mm.

a)
17
b)
18

Correct answer is between '17,18'. Can you explain this answer?

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A reservoir of surface area 400 hectares has water temperature = 27°C...

Evaporation using Meyer’s Formula

E = K_m(e_s – e_a) (1 + v₉/16

Km = 0.36

Relative humidity, ea/es = 0.4

e_s = 17.54/0.4 = 43.85 mm of Hg

Velocity of wind at 9 m above ground, v₉/v₂ = (9/2)1/7

v₉ = 11 × 1.239 = 13.629 km/hr

Putting in Meyer’s Formula, E = 0.36(43.85 – 17.54) (1 + 13.629/16) = 17.539 mm/day

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