Question

How do you list these starting with the smallest: tributary, stream, rill. Gully, runoff, river?

Answer 1

Hint: A stream could be a body of water with surface water flowing within the bed and banks of a channel. The flow of a stream is controlled by three inputs – surface water, subsurface water and groundwater. River is employed for streams from larger springs just like the Silver River and runoff; when this water is concentrated in a very channel, a stream has its birth.

Complete answer:
 1- A runoff-water refers to the flow of water after a stormwater, or other source. It occurs because the soil is saturated, it's at full capacity of water absorption and also the soil drains the surplus.
2- A rill refers to a superficial channel delving soil caused by wearing, it doesn't have an excessive amount of depth (a few centimetres), so it cannot have a good amount of water, just over a runoff-water.
3- A gully is when running water erodes the soil, creating a landform, it typically occurs in hills, there it's created easier. Gullies can create ditches or small valleys.
4- A stream may be a small river, it is a surface water that flows into a channel. Basically, streams are the results of geological and hydrological factors, they're a part of the water cycle.
5- A tributary(or affluent) could be a river that flows into a lake or other mainstream rivers, but it doesn't flow into the ocean, that is the difference. A tributary is additionally called an affluent.
6- A river may be a natural flowing water which might flow towards lakes, oceans, seas or other mainstream rivers. The difference with tributaries is that rivers flow into seas or oceans, and that they can have a much bigger mass of water.

Therefore, the correct order in keeping with size is: Runoff, rill, gully, stream, tributary, and river.

Note: Rill erosion is caused by slow movement of water along small channels on bare land with less vegetative cover. Gully erosion creates a deep-channels that the surface runoff is further enhanced. The water movement is quicker, creating a deeper-channels.