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3. Use the Penman combination equation to estimate evaporation from a (water) surface for the following conditions: temperature of the surface, To 290 K; air temperature, Ta- 300 K; relative humidity, rh 50%; wind speed, u2-3 mph; surface pressure, p-100000 Pa; roughness length, zo 0.0001 m; net available energy, Q 180 W/m2
engineering   Civil-Engineering   
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