Wisconsin Mound Soil Absorption System and Area FillPractice Exam

What aspect of the soil should be assessed to determine the basal loading rate for a Wisconsin mound system?

1. Surface texture

2. Soil horizon

3. Groundwater level

4. Plant composition

The correct answer is: Soil horizon

To determine the basal loading rate for a Wisconsin mound system, assessing the soil horizon is crucial. The soil horizon refers to the distinct layers of soil that develop from geological and biological processes, each with unique characteristics that influence water retention, drainage, and nutrient availability. The specific properties of these layers, such as texture, structure, depth, and permeability, play a significant role in how well the soil can absorb and filter effluent from the mound system. Understanding the soil horizon helps in determining its capacity to support the mound system without causing issues such as surface ponding or excessive groundwater contamination. For instance, a well-developed topsoil layer with good drainage can indicate a higher loading rate, whereas a compacted or clay-rich horizon may restrict water movement, suggesting a need for a reduced loading rate. In contrast, while surface texture is important, it is just one aspect of the soil and does not provide a comprehensive picture on its own. Groundwater levels are relevant to whether a mound system can be placed in a certain location, but they do not directly indicate the absorption capabilities of the soil. Plant composition can provide insights into the ecological environment but is not a decisive factor in calculating the loading rate for the mound system. Therefore, focusing on the soil horizon offers