This document provides a summary of various hydraulic structures including dams, bridges, culverts, sluice gates, aqueducts, and siphons. It describes each structure, how it works, common types, uses, and examples of important structures around the world. Dams are designed to impound water and generate hydroelectric power. Bridges span physical obstacles to provide passage. Culverts allow water to flow under obstructions. Sluice gates control the flow of water. Aqueducts convey water over long distances. Siphons use gravity and pressure differences to move water uphill without pumps. These structures are crucial for water management, irrigation, transportation, power generation, and flood control.