A Rill can be a:

In fluvial geomorphology, a rill is a narrow and shallow incision into topsoil layers, resulting from erosion by overland flow or surface runoff. Rills are most common on slopes of unvegetated ground and agricultural land. However, they can occur on a variety of surfaces. Rills may even be found on the surface of certain soluble rocks like limestone. Rills are often seen as the first signs of major soil erosion, and if left to grow, may evolve into larger fluvial features like gullies, streams, or rivers.

Formation of Rills

Rills are created when water erodes the topsoil on hillsides, and so, are significantly affected by seasonal weather patterns. They tend to appear more often in rainier months. Rills begin to form when the runoff shear stress, the ability of surface runoff to detach soil particles, overcomes the soil’s shear strength, the ability of soil to resist force working parallel to the soil’s surface. This begins the erosion process as water breaks soil particles free and carries them down the slope. These forces explain why sandy, loamy soils are especially susceptible to the formation of rills, whereas dense clays tend to resist rill formation.

Wayne Campbell (born 23 September 1972) is a retired Australian rules football player for the Richmond Football Club of the AFL.

In a career spanning 15 seasons (from 1991 until 2005), he played 297 games, just 3 short of the famed 300-game milestone. He held the captaincy of the club from 2001 to 2004, before handing the reins to Kane Johnson.

Wayne Campbell was regarded as a very consistent player, known for his ability to run all day, amass possessions and dispose of the ball accurately, especially when having a set shot for goal. He was also an intelligent player, able to read the play before most others and make calculated decisions when under pressure. After early stints up forward, in the backline and on the wing, he became the prime mover in the Richmond midfield during the mid-to-late 1990s.

Campbell had a celebrated career, winning the Jack Dyer Medal (the award for the Best and Fairest player at the Richmond Football Club) four times, in the years 1995, 1997, 1999 and 2002. He was also runner-up for the Jack Dyer Medal three times in the years 1992, 1993 and 2001. He placed third for the award in 1998.