Sediment moved by water can be larger than sediment moved by air because water has both a higher density and viscosity. In typical rivers the largest carried sediment is of sand and gravel size, but larger floods can carry cobbles and even boulders.

Answer: A stream flowing at a velocity of 100 centimeters per second cm/sec. 2.

How fast must a stream be moving to carry a particle with a 0.03cm diameter? ________________________________cm/s.

Streams carry dissolved ions as dissolved load, fine clay and silt particles as suspended load, and coarse sands and gravels as bed load. Fine particles will only remain suspended if flow is turbulent. In laminar flow, suspended particles will slowly settle to the bed.

The top end of a stream, where its flow begins, is its source. The bottom end is its mouth.

2. A stream is flowing at 10 cm/s (which means it takes 10 s to go 1 m, and that’s pretty slow).

Rainfall, whether slight or heavy can affect water flow and sediment transport. The extent to which a weather event will influence sediment transport is dependent on the amount of sediment available. Snowmelt in a glaciated area will result in a high sediment load due to glacial silt 10.

On the other hand, a 0.01 mm silt particle only needs a velocity of 0.1 cm/s to remain in suspension, but requires 60 cm/s to be eroded. In other words, a tiny silt grain requires a greater velocity to be eroded than a grain of sand that is 100 times larger!

o If a stream is flowing faster due to flood conditions, then the carrying power of the stream will increase and the sizes of particles deposited will increase as well. Glacial ice deposits –very different from stream (water) deposits.

(a) What size of particles can be eroded at 10 cm/s? No particles, of any size, will be eroded at 10 cm/s, although particles smaller than 1 mm that are already in suspension will stay in suspension.