What material can be used for channel stabilization when anticipating extremely high velocities?

When anticipating extremely high velocities in channel stabilization, the use of riprap or rock gabions is particularly effective. Riprap consists of large stone or rock fragments placed along streambanks or river channels to protect against erosion. These materials have the strength and weight necessary to withstand the forces generated by high-flow waters, preventing soil erosion and maintaining the integrity of the channel.

Rock gabions, which are wire mesh containers filled with rock, also provide significant resistance against rapid water flow. They can absorb and dissipate the energy of moving water and create a stable structure that retains sediment and prevents erosion, making them well-suited for areas prone to high velocities.

In contrast, concrete blocks might not provide sufficient interlocking and stability under rapid flow conditions, while gravel can be easily displaced by strong currents. Silt curtains are utilized primarily for sediment control and do not serve a structural purpose for stabilization against high velocities. Therefore, riprap and rock gabions are the ideal choices for channel stabilization in conditions involving extremely high fluid velocities.