These rills and gullies are important geomorphological features in clay-rich badlands areas. It also prevents the formation of rills and gullies. If runoff continue to incise and enlarge rills, they may eventually grow to become gullies. Rills are narrow and shallow channels which are eroded into unprotected soil by hillslope runoff. Shalt thou disperse it, scattered into rills. Generally, where water erosion rates on disturbed upland areas are greatest, rills are active. If left alone, these rills may erode considerable amounts of arable soil. Therefore, the formation of rills is primarily controlled by the slope of the hillside. Artificial rills are channels constructed to carry a water supply from a distant water source. Kinau was known as selenographer who had specialised in lunar rills. Unfortunately, the considerable effect rills have on landscapes often negatively impact human activity. The highly elastic and muscular buccal rills are a specialized adaptation to this feeding mode. Rills have been observed washing away archaeological sites. Although rills are small, they transport significant amounts of soil each year. Rills are also used for aesthetic purposes in landscape design.