What determines how much material a stream can erode?

The amount of material a stream can erode is primarily determined by its velocity, volume of water, and the sediment load it carries. Faster-moving water has greater kinetic energy, allowing it to lift and transport larger particles. Additionally, the stream's gradient and the nature of the streambed materials, such as hardness and cohesiveness, also influence its erosive capacity. Finally, factors like vegetation cover and land use can affect erosion indirectly by altering water flow and sediment availability.