The correct answer is D. All the above.
A hydraulic structure is a structure that is designed to control, contain, or convey fluids. Hydraulic structures are typically used in water management, irrigation, and hydropower applications.
Seepage forces are the forces that are exerted by water as it flows through a porous
material. Seepage forces can cause a hydraulic structure to collapse if they are not properly designed.Hydraulic jump is a phenomenon that occurs when a fluid flows from a region of high velocity to a
region of low velocity. The hydraulic jump can cause a sudden increase in pressure, which can damage a hydraulic structure if it is not properly designed.Hydraulic pressure is the pressure that is exerted by a fluid on a surface. Hydraulic pressure can cause a hydraulic structure to collapse if it is not properly designed.
Therefore, a hydraulic structure must be designed to withstand all of the above forces in order to be safe and reliable.