Wisconsin Mound Soil Absorption System and Area FillPractice Exam

Area fill mounds must be designed with what slope from the shoulder to the ground surface?

1. 3:1

2. 4:1

3. 5:1

4. 6:1

The correct answer is: 5:1

The design of area fill mounds typically requires a specific slope from the shoulder to the ground surface to ensure proper stability, erosion control, and effective water management. A slope of 5:1 means that for every 5 units of horizontal distance, there is a 1 unit change in vertical distance. This gradual slope helps prevent the erosion that can occur with steeper slopes and allows for better infiltration and absorption of water into the soil. A 5:1 slope is considered sufficiently gentle to enhance stability and minimize soil movement, while still maintaining effectiveness for the soil absorption system. This design helps to distribute the weight of the fill more evenly and reduces the likelihood of runoff or pooling, which could compromise the performance of the absorption system. Choosing a slope that is too steep may lead to issues such as increased runoff and potential failure of the system, as water may not properly infiltrate the mound. Therefore, the 5:1 slope is the appropriate choice for maintaining the integrity and functionality of area fill mounds.