The landforms created as a result of degradational action erosion or aggradation work deposition of running water is called fluvial landforms. The creative work of fluvial processes may be divided into three physical phases—erosion, transportation and deposition. Running water may carry out erosion through any one or more of the following ways:. Mechanical action may include the solid river load striking against rocks and wearing them down corrasion or abrasion , or the force of running water wearing down rocks hydration or the river load particles striking, colliding against each other and breaking down in the process attrition. The lowest level to which a valley can be eroded by running water is called its base level.
Fluvial Erosional Landforms | Stages of River Valley
River Systems and Fluvial Landforms - Geology (U.S. National Park Service)
There are two components of running water. One is overland flow on general land surface as a sheet. Another is linear flow as streams and rivers in valleys. Most of the erosional landforms made by running water are associated with vigorous and youthful rivers flowing over steep gradients.