Question $3\mathrm{.}3$ please only! $3\mathrm{.}1$ In pan measurements close to a reservoir, the following data were observed on a certain day. Determine the daily evaporation by $($a$)$ the simple formula assuming that $K=0\mathrm{.}7,$ and $($b$)$ the revised formula, assuming that $K^{\text{'}}=1\mathrm{.}5$ at $4m.$

Pan evaporation $=15mm$

Mean air temperature at $4m=23C$

Maximum reservoir temperature $=18C$

Minimum reservoir temperature $=15C$

Maximum pan temperature $=24C$

Minimum pan temperature $=18C$

Relative humidity $=47\%$

$3\mathrm{.}2$ The temperature and relative humidity averaged for the month of October have the following values. During the month, the evaporation measured from the pan was $19cm.$ Determine the monthly evaporation from the lake by $($a$)$ the simple formula, assuming that $K=0\mathrm{.}75,$ and $($b$)$ the revised formula, assuming that $K^{\text{'}}=1\mathrm{.}5.$

Monthly average mean air temperature at $4m=17C$

Monthly average maximum lake temperature $=13C$

Monthly average maximum pan temperature $=16C$

Monthly average relative humidity $=60\%$

$3\mathrm{.}3$ Solve Problem $3\mathrm{.}1$ by the aerodynamic method of evaporation at $4m$ if the wind speed is $23\frac{m}{s}$ at $4m$ level and $C_E=1\mathrm{.}3{10}^{-3}$ at $4m.$