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When constructing a dam, the core serves to hold back the water. To protect this core from potential erosion caused by water flowing over the dam and carrying sediments, filters are employed. A filter acts as a barrier made from specified materials designed to control what particles can pass through to the core. By doing so, it prevents erosion and maintains the integrity of the dam.
Filters vary based on the project's requirements and associated costs. They are essential for dissipating pore pressure, which is the pressure exerted by water within the soil. This result minimizes the risk of erosion as it prevents fine sediment from entering the core material.