A rectangular foundation, $5$ m x $7$ m$,$ rests on the surface of a soil mass. Stress transmitted on the surface of a soil deposit is $100$ kPa.

$($A$)$ Determine the vertical stress increase at a depth of $10$ m below the points A$,$ using a chart for influence factor, $!$ for the corner of rectangular loaded area.

$($B$)$ Determine the vertical stress increase at a depth of $10$ m below the points A$,$ using approximate method.

$($C$)$ Determine the vertical stress increase at a depth of $10$ m below the points B$,$ using a chart for influence factor, $!$ for the corner of rectangular loaded area attached.

A rectangular foundation, $5m7m,$ rests on the surface of a soil mass. Stress transmitted on the surface of a

soil deposit is $100$kPa.

$($A$)$ Determine the vertical stress increase at a depth of $10m$ below the points $A,$ using a chart for influence

factor, $I_z$ for the corner of rectangular loaded area.

$($B$)$ Determine the vertical stress increase at a depth of $10m$ below the points $A,$ using approximate method.

$($C$)$ Determine the vertical stress increase at a depth of $10m$ below the points $B,$ using a chart for influence

factor, $I_z$ for the corner of rectangular loaded area attached.

$($D$)$ Determine the vertical stress increase at a depth of $10m$ below the points $B,$ using approximate method.$($D$)$ Determine the vertical stress increase at a depth of $10$ m below the points B$,$ using approximate method.