Water table of an aquifer drops by $100 \mathrm{~cm}$ over an area of $1000 \mathrm{~km}^{2}$. The porosity and specific retention of the aquifer material are $25 \%$ and $5 \%,$ respectively. The amount of water (expressed in $\mathrm{km}^{3}$ ) drained out from the area is

Water table of an aquifer drops by $100 \mathrm{~cm}$ over an area of $1000 \mathrm{~km}^{2}$. The porosity and specific retention of the aquifer material are $25 \%$ and $5 \%,$ respectively. The amount of water (expressed in $\mathrm{km}^{3}$ ) drained out from the area is

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