A flow net is given in Figure Q$2.$

$(1)$ Determine the quantity of seepage water flowing through the clay stratum below a unit length of the dam and the water pressure at Point A on the base of the dam. The hydraulic conductivity of the clay is $\backslash (2\backslash$times $10^\{-4\}\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$sec$\}\backslash ).$

$(2)$ Determine the water pressure at Point $\backslash ($ A $\backslash )$ at the bottom of the dam.