The elevations of pressure gauge and porous cup of the tensiometer installed in unsaturated zone are $145.8 \mathrm{~m}$ and $144.2 \mathrm{~m},$ respectively. Pressure measured at the gauge is $-19.62 \times 10^{3} \mathrm{~N} \mathrm{~m}^{-2}$. The specific weight of water is $9810 \mathrm{~N} \mathrm{~m}^{-3}$. The estimated pressure at the porous cup is_____________ $\mathrm{N} \mathrm{m}^{-2}$
The elevations of pressure gauge and porous cup of the tensiometer installed in unsaturated zone are $145.8 \mathrm{~m}$ and $144.2 \mathrm{~m},$ respectively. Pressure measured at the gauge is $-19.62 \times 10^{3} \mathrm{~N} \mathrm{~m}^{-2}$. The specific weight of water is $9810 \mathrm{~N} \mathrm{~m}^{-3}$. The estimated pressure at the porous cup is_____________ $\mathrm{N} \mathrm{m}^{-2}$