Calculate and solve the following problems.

$3\mathrm{.}1$ The surface water area of reservoir is $5k{m}^2.$ The average values of climate parameters during

a week: Water temperature $=27\mathrm{.}5C,$ Relative humidity $=45\%,$ wind velocity at $1$ m above ground

surface $=19k\frac{m}{h}.$ Estimate the average daily evaporation from the lake by using Meyer's formula.

$(5$ points$)$

$3\mathrm{.}2$ An ISI Standard evaporation pan at the site indicated a pan coefficient of $0\mathrm{.}8$ on the basis of

calibration against controlled water budgeting method. If this pan indicated an evaporation of $70$ mm

in the week under question,

$(1)$ Estimate the accuracy if Meyer's method relative to the pan evaporation measurements.

$(2\mathrm{.}5$ points$)$

$(2)$ Estimate the volume of water evaporated from the lake in that week.

$(2\mathrm{.}5$ points$)$

$($Total $10$ points$)$