Question $1$: In a lake with a surface area of $200k{m}^2,$ annual precipitation depth was measured as $70$

cm for a given year. The annual average flow of the inflow entering the lake is $1\mathrm{.}20\frac{m^3}{s},$ and the

annual average outflow discharge from the lake is $1\mathrm{.}27\frac{m^3}{s}.$ It was observed that the water level in the

lake increased $9$ cm during that year. The infiltration water from the lake is negligible. Based on these

data, calculate the annual evaporation height on the lake surface within that year.

Exercise $2$: Draw the hydrological water cycle. Explain each component by the figures and words.

Exercise $3$: Two and half centimeters of rain per day over an area of $200k{m}^2$ is equivalent to average

rate of input of how many cubic meters per second of water to that area?

Exercise $4$: Estimate the constant rate of withdrawal from a $1375$ ha reservoir in a month of $30$ days

during which the reservoir level dropped by $0\mathrm{.}75$ m in spite of an average inflow into the reservoir of

$0\mathrm{.}5M\frac{m^3}{?}$ day. During the month the average seepage loss from the reservoir was $2\mathrm{.}5$ cm $,$ total

precipitation on the reservoir was $18\mathrm{.}5$ cm and the total evaporation was $9\mathrm{.}5$ cm $.$