Water Surface Elevation of the Lake at the End of the Month

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A lake had a water surface elevation of 103.200 m above datum at the beginning of a certain month.

In that month the lake received an average inflow of 6.0 m3/s from surface runoff sources. In the same period, the outflow from the lake had an average value of 6.5 m3/s.

Further, in that month, the lake received a rainfall of 145 mm and the evaporation from the lake surface was estimated as 6.10 cm.

What will be the water surface elevation of the lake at the end of the month assuming no contribution to or from the groundwater storage?

The average lake surface area may be taken as 5000 hectares.

Please share all steps (if possible).

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