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To ensure self-scouring conditions for a soil branch, the appropriate slope is essential for effective drainage and to prevent sediment buildup. A slope of ¼ inch per foot is generally recommended because it provides an adequate gradient that promotes water flow velocity sufficient to transport sediment without leading to erosion of the surrounding soil.

This slope facilitates a natural hydraulic force that keeps the channel or branch clean by moving debris and particles along with the water flow. A gentler slope, such as ¼ inch per foot, is effective in allowing water to flow steadily while also minimizing the risk of excessive wear on the channel banks, which can occur at steeper gradients.

Choosing a different slope, such as ½ inch per foot, could increase the risk of erosion and destabilization, while slopes that are too flat, like 1/8 inch per foot, may not achieve the necessary flow speed to carry sediments effectively. The balance of maintaining enough flow while ensuring the stability of the surrounding area is crucial, making the ¼ inch per foot slope the most suitable choice for self-scouring conditions.