Area of the topside of the sheet metal is  square feet.

Sheet metal is submerged horizontally in feet of water.

Depth of the water ft.

Fluid force on metal sheet .

Where Fluid force, pressure of an object and Submerged horizontal surface area.

Pressure of an object at depth in a liquid is .

Where weight density of liquid.

Here liquid is water, for water pounds per cubic foot.

Substitute and in .

.

Pressure of object pounds per square feet.

Submerged surface area square feet.

Substitute and in .

.

Fluid force on top side is  lb.

Fluid force is lb.