What is "siltation" concerning navigation?

Siltation refers to the accumulation of sediment, such as silt, sand, and other particulate matter, in navigation channels. This process can significantly affect the navigable depth of these waterway areas, leading to hazards for vessels. When sediment builds up in channels, it can reduce the available depth, increasing the risk of grounding or collision for ships and boats using these routes. Navigational charts must be updated to reflect these changes, and periodic dredging may be necessary to maintain safe navigation. Understanding siltation is essential for maintaining the safety and efficiency of maritime operations.