What is the purpose of using riprap on slopes?

Using riprap on slopes serves the primary purpose of preventing erosion by water. Riprap consists of loose stones or rock fragments that are placed on the surface of slopes, embankments, or shorelines. This material effectively absorbs and dissipates the energy of flowing water, which can otherwise strip away soil and destabilize the slope.

By providing a protective layer, riprap can significantly reduce the impact of water runoff and the erosion process, which is especially important in areas subject to heavy rainfall or in close proximity to water bodies. When water flows over or against the riprap, the stones help to slow down the water velocity, thereby minimizing the potential for soil displacement.

Although riprap can contribute to the aesthetics of a landscape and may provide some habitat opportunities for wildlife, these are secondary benefits compared to its essential function in erosion control. Enhancing drainage efficiency is not its primary role, as riprap does not facilitate water movement but rather acts as a barrier to prevent erosion.