A certain lake has a surface area of 90km2 at the beginning of a certain month and the water depth was 92m for the whole surface area of the lake. During that month the reservoir receives an average inflow of 110 mm and 220m3 /s as rainfall and direct runoff respectively. Whereas the outflow from the reservoir was 210m3 /s as irrigation, 200mm as evapotranspiration and 300mm as groundwater recharge during that month. Find out the depth of the reservoir at the end of that month
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