A concrete gravity dam section is shown in the figure. Assuming unit weight of water as $10 \mathrm{kN} / \mathrm{m}^{3}$ and unit weight of concrete as $24 \mathrm{kN} / \mathrm{m}^{3},$ the uplift force per unit length of the dam (expressed in $\mathrm{kN} / \mathrm{m})$ at $\mathrm{PQ}$ is

A concrete gravity dam section is shown in the figure. Assuming unit weight of water as $10 \mathrm{kN} / \mathrm{m}^{3}$ and unit weight of concrete as $24 \mathrm{kN} / \mathrm{m}^{3},$ the uplift force per unit length of the dam (expressed in $\mathrm{kN} / \mathrm{m})$ at $\mathrm{PQ}$ is

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