Various sizes of riprap and gravel are often used in components of a stormwater management system. What role do these rocks play in managing runoff?
Riprap is stone that is angular and usually about the size of a football. It is used to armor shorelines or areas that receive a high volume of water flow, such as below an inlet or outlet pipe or along a channel that is experiencing erosion. The riprap has two main purposes: to slow the flow of water by forcing it to navigate through the rocks and to hold sediment in place to prevent erosion.