b$)$ For a city, in July, average net radiation is $185\frac{W}{m^2},$ air temperature $28\mathrm{.}5C,$

relative humidity $55\%$ and wind speed $2\mathrm{.}7\frac{m}{s}$ at height $2$ m $.$ Calculate the

open water evaporation rate in $m\frac{m}{?}$ day using the

Energy method

II$.$ Aerodynamic method

III. Combination method

IV$.$ Priestley taylor method.

Assume standard atmospheric pressure $101\mathrm{.}3$ kPa and $Z_0=0\mathrm{.}03cm.$

$k=0\mathrm{.}4,{}_o=1\mathrm{.}19k\frac{g}{m^3}$ for air, and ${}_w=997k\frac{g}{m^3}.$

$e_{as}=3167Pa$ and $e_a=1267Pa$; Latent heat of vaporization $(l_v)=2441k\frac{J}{k}g$;

$C_p=1005\frac{J}{k}g-K$ for air,

$\frac{K_h}{K_w}=1\mathrm{.}00$