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$2.$ The concrete retaining shown wall is $20ft$ high and $4ft$ wide. The water table is $15ft$ below the ground behind the wall.

The soil density is $100l\frac{b}{f}{t}^3.$ The soil cohesion $K=0\mathrm{.}5.$ What is the lateral force on the wall, per $100ft$ of wall length, due to the soil and water? $(1078000$ lb $?)$

$3.$ For the previous question how much lateral resistance to sliding does $100ft$ of the wall provide if the coefficient of friction between the wall and soil is $0\mathrm{.}92?$ Reinforced concrete weighs $150l\frac{b}{f}{t}^3.$

$(1104000$ lb $?$