Wisconsin Mound Soil Absorption System and Area FillPractice Exam

What happens to the shape of a mound when the linear loading rate is smaller?

1. It becomes shorter and wider

2. It remains unchanged

3. It becomes longer and narrower

4. It becomes taller and thinner

The correct answer is: It becomes longer and narrower

When the linear loading rate decreases, the mound's shape responds by becoming longer and narrower. This phenomenon occurs because a lower linear loading rate indicates that less weight or pressure is applied over a given area. As a result, the mound can extend horizontally more than it increases in vertical height. In the context of soil absorption systems, this elongation facilitates an improved distribution of effluent over a larger surface area, allowing for more effective absorption and treatment of wastewater. The lengthening of the mound means that effluent spreads out more, reducing the risk of saturating portions of the system and improving the overall function of the soil absorption process. Consequently, while a larger footprint may develop, the vertical profile will not increase significantly, leading to a form that is longer and narrower.