Sedimentation and Erosion Control Certification Practice Exam

The correct answer pertains to the design and application of silt fences in helping to manage sediment during various flow conditions. In the context of sheet flow, which is a type of surface runoff characterized by a thin layer of water flowing evenly over a surface, the maximum drainage area allowed for a silt fence is important for ensuring its effectiveness in minimizing soil erosion and capturing sediments.

For sheet flow conditions, a silt fence can effectively handle a drainage area of up to 1/4 acre for every 100 feet of barrier length. This limit is in place because excessive drainage area could overwhelm the silt fence, leading to potential failure in its ability to filter sediments from the water flow. The design parameters are critical to maintain the integrity and utility of the silt fence in managing sedimentation.

Understanding this limit helps ensure compliance with erosion control practices, making sure that sediment is adequately contained and does not contribute to pollution in water bodies. The specified area of 1/4 acre is grounded in engineering principles that take into account the capacity of the silt fence fabric and the expected sediment load under typical sheet flow scenarios.

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