Wisconsin Mound Soil Absorption System and Area FillPractice Exam

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Wisconsin mounds must be designed with what side slope from the crown to the ground surface?

The correct answer is: 3:1

The proper side slope for Wisconsin mounds, which are a type of on-site wastewater treatment system, is typically designed at a ratio of 3:1 from the crown to the ground surface. This slope specification is important for several reasons. First, a 3:1 side slope provides stability to the mound system, preventing erosion and ensuring that the soil structure remains intact over time. This is essential for the effective functioning of the mound, as any erosion or slumping could lead to a failure in the absorption of effluent into the surrounding soil. Additionally, the 3:1 slope allows for adequate surface water runoff, reducing the chance of puddling or saturation at the base of the mound. Proper drainage is crucial for maintaining the effectiveness of the mound by ensuring that the effluent can move through the soil layers efficiently. In summary, the 3:1 side slope is specifically prescribed to enhance the stability and functionality of Wisconsin mounds, making it the correct choice for effective design in these systems.