$2$ Problem $2(20$ pts$)$

For a particular location, the average net radiation is $200\frac{W}{m^2}$; air temperature is $25C$ and relative humidity is $40$ percent and the wind speed is $2\frac{m}{s}$ at a height of $2$ m $.$ Determine the open water evaporation using combined approach if the roughness height is $0\mathrm{.}03$ m $.$