A retaining wall, 3m high supports a dry cohesionless backfill with a plane ground surface sloping upwards at a surcharge angle of 10$^{\circ}$ from top of the wall.

The back of the wall is inclined to the vertical at a positive batter angle of 8$^{\circ}$. The unit weight of soil is 19.6 kN/m$^{3}$ and $\phi=29^{\circ}$. Assuming an angle of wall friction of 11$^{\circ}$, determine the total active force by Rebhann's method.

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