Earthfill dams are structures made primarily from natural materials like soil, clay, and rock. They are built to hold back water, creating reservoirs for various purposes such as irrigation, flood control, and hydroelectric power generation. The design of these dams relies on the weight of the earth materials to resist the pressure of the water behind them. These dams are typically wide at the base and taper towards the top, which helps distribute the weight evenly. Earthfill dams can be constructed in various shapes and sizes, depending on the landscape and the intended use. Their construction is often more economical compared to other types of dams, such as concrete dams.