The hyperconcentration tributaries of the Yellow River in Inner-Mongolia have a lot of sediment but not much water. The amount of water and sediment they carry varies a lot throughout the year. These tributaries have different amounts of water and sediment compared to each other. The sediment concentration can change a lot even with the same amount of water. When there is a lot of water, there is a limit to how much sediment can be carried. Floods in these tributaries happen suddenly, with high peaks, lots of sediment, and don't last long. The amount of water and sediment in the flood stays consistent.