According to IS code method, what is the formula of reduction factor during effect of water table on bearing capacity of soil. (where, RW = reduction factor)
1
\( \mathrm{R}_{\mathrm{w}}=0.5\left(1+\frac{\mathrm{Z}_{\mathrm{w} 2}}{B}\right) \\\)
2
\( \mathrm{R}_{\mathrm{w}}=0.5\left(1+\frac{\mathrm{Z}_{\mathrm{w} 2}}{\mathrm{D}}\right) \\\)
3
\( \mathrm{R}_{\mathrm{w}}=0.5\left(1-\frac{\mathrm{Z}_{\mathrm{w} 2}}{B}\right) \\\)
4
\( \mathrm{R}_{\mathrm{w}}=0.5\left(\frac{\mathrm{Z}_{\mathrm{w} 2}}{\mathrm{D}}\right) \)
5
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