What are the three types of hydraulic foundations? a) Cajones, escolleras, and cajones neumáticos. b) Cajones, escolleras, and tablestacas. c) Ca...

The answer is (c), caissons, sheet piles, and cofferdams.

Caissons are watertight structures that are used to create a dry working space below the water level. They are typically made of steel or concrete and can be either open or closed. Open caissons are used for shallow water depths, while closed caissons are used for deeper water depths.

Sheet piles are long, interlocking metal or timber piles that are driven into the ground to form a watertight wall. They are typically used to create a cofferdam, which is a temporary watertight enclosure that is used to protect an area from water.

Cofferdams are temporary structures that are used to create a dry working space below the water level. They are typically made of sheet piles or caissons.

The three types of hydraulic foundations are:

• Caissons
• Sheet piles
• Cofferdams

These foundations are used to support structures that are built in water or on soft ground. They provide a stable foundation for structures and prevent them from sinking or being washed away by water.