Hydrologic data over a 2-year period (1986-1987) for a mountain basin containing
ID: 1711694 • Letter: H
Question
Hydrologic data over a 2-year period (1986-1987) for a mountain basin containing a lake are given in the table below. The numbers are in volumes of water and the unit is 1000 m^3 (multiply numbers by 1000 m^3). The area of the basin is 1.2 km^2. Precipitation is the input to the basin including snow and rain. Evaporation is the output of the basin including snow, ET (evapotranspiration), and the lake. Positive number in storage change indicates storage increase in that year. Negative number in storage change indicates storage decrease in that year. Use the water balance equation to calculate total outflow (m^3) of the basin in the two years. Make clear any assumption you may have.Explanation / Answer
water balance equation--
assumption---
Equation of water balance is applicable in closed system and water entering in the basin via precipitation is going only into surface runoff,evaporation and change in storage.
precipitation=
evaporation+snow storage change+groundwaterstorage change+total outflow
in year 1986--
3022+63=496+84+9+27+7+O1986
O1986=2462
hence total outflow in year 1986 will be 2462x103 m3
in year 1987--
1098+129=271+81+18+97-17+O1986
O1987=777
hence outflow in year 1987 will be 777x103 m3
total outflow in two years will be (2462+777)x103 =3239000 m3 (ans)
precipitation=
evaporation+snow storage change+groundwaterstorage change+total outflow
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