Rip rap walls can be affordable and simple method of protecting shorelines from storms. Rip rap walls are constructed by piling coarse, angular rocks to create a barrier against moving water. These walls provide a deflection point for high waves, dispersing the energy and preventing erosion. Though they can be fairly inexpensive and easy to maintain, they may have significant ecological impact. Rip rap walls can increase the speed of a river, eroding areas that are unprotected. They are also a less beneficial option that natural vegetation, which protect the soil along moving water sources most effectively. Rip rap walls are also not ideal as a permanent option, requiring constant upkeep to combat erosion.