GATE Civil Engineering
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The average surface area of a reservoir in the month of June is $20 \: km^2$. In the same month, the average rate of inflow is $10 \: m^3/s$, outflow rate is $15 \: m^3/s$, monthly rainfall is $10$ cm, monthly seepage loss is $1.8$ cm and the storage change is $16 \:  million \: m^3$. The evaporation (in cm) in that month is:

  1. $46.8$
  2. $136.0$
  3. $13.6$
  4. $23.4$
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