The solids are transported in different physical states.

Solids move through the sewer by rolling, sliding or leaping along the channel bed. The continuous transport of solids by the flow of wastewater is known as suspended or suspension transport (Figure). In this case, the suspended solids remain in the floating state through the wastewater flow. The weight of the heavier solids counteracts the uplifting force of the turbulent flow [SteinR2005] [Glazi1989].

The above-mentioned forms of transport have no independent classes. They often occur simultaneously, and lead to a constant mixing of solids. The transition between the individual processes is continuous, making the boundary between them difficult to determine.

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