A braided stream forms when the sediment load exceeds channel capacity due to regular floods and variable flow. Which option best describes this process?

• A. The stream flows are uniform with minimal sediment
• B. Sediment load is always less than capacity
• C. The stream aggressively erodes all sediment, forming a single channel
• D. As floods decline, sediment drops out and low-flow conditions force split channels around the dropped load, producing braided pattern

Answer: (D)

Braided streams form when sediment supply overwhelms the stream’s ability to transport it, so material is deposited and the flow splits around those deposits. During floods the river carries a heavy load, but as discharge falls after the peak, the excess sediment settles out and builds bars that obstruct the main channel. In these lower-flow conditions, the water moves around the deposited material, creating multiple, shifting channels. That is exactly what the described option conveys: as floods decline, sediment drops out and low-flow conditions force split channels around the dropped load, producing a braided pattern. If flows were uniform with little sediment, or if the sediment load were always under capacity, you wouldn’t get braided channels; and eroding all sediment into a single path wouldn’t produce the characteristic braided network.