murierrun$-$i

Problem $1$:

The following data were observed at Demirk$$pr$$ Dam site on Gediz River in June $1971.$ Find the monthly evaporation in $mm$ from the reservoir surface of this dam. If there were a Class A pan installed nearby the reservoir, what would be the monthly evaporation observed from this pan?

Storage at the beginning of the month: ${495\mathrm{.}5}^{**}{10}^6{m}^3$

Storage at the end of the month: ${476\mathrm{.}4}^{**}{10}^6{m}^3$

Average surface area of the reservoir in the month: $42\mathrm{.}5k{m}^2$

Mean inflow: $15\mathrm{.}8\frac{m^3}{s}$

Amount of water used for power generation: ${50\mathrm{.}5}^{**}{10}^6{m}^3$

Depth of rainfall for the month: None

Average seepage rate in the month: $424\mathrm{.}38\frac{L}{s}.$

Problem $2$:

For the same reservoir in Problem $1,$ the area of lake surface decreased by $3\%$ in the next month, July $1971,$ while the seepage, evaporation, inflow, and water used for power are the same. There was no rain in this month either. Determine the change in storage for this month.