What are areas called where stream flow slows and water depth increases?

The term for areas where stream flow slows and water depth increases is "pools." In aquatic ecosystems, pools are typically found in sections of rivers or streams where the current is less vigorous compared to other areas, allowing for deeper water to accumulate. This slower movement of water can create habitats that support diverse aquatic life, as well as provide refuge for organisms during high flow conditions. The depth and reduced flow of pools often contrast sharply with adjacent areas such as riffles, where water flows rapidly over coarse substrates.

The formation of pools is important in the context of river dynamics and ecology, as they play a critical role in sediment deposition, nutrient cycling, and providing habitats for various species. Understanding the physical characteristics of both pools and their surrounding environments is essential for managing aquatic habitats and preserving biodiversity in freshwater ecosystems.