Wisconsin Mound Soil Absorption System and Area FillPractice Exam

What is the allowable soil permeability for the upper 10 inches of the soil profile in Wisconsin mounds?

1. Very Low to Moderate

2. No Slower than Moderately Low

3. No Slower than Moderately High

4. Low to Moderate

The correct answer is: No Slower than Moderately Low

The allowable soil permeability for the upper 10 inches of the soil profile in Wisconsin mound systems is classified as "No Slower than Moderately Low." This standard is crucial because the hydraulic properties of the soil directly influence the effectiveness of the mound system in treating wastewater. Moderately Low permeability allows for sufficient water movement through the soil while still providing adequate time for treatment processes such as filtration and bacterial action to occur. This permeability ensures that effluent does not pool, which could lead to surface saturation and potential environmental hazards, such as groundwater contamination. By specifying that the soil must not be slower than Moderately Low, guidelines aim to strike a balance between adequate drainage and treatment capacity, safeguarding both public health and environmental quality. This is particularly important in regions like Wisconsin, where soil characteristics can vary significantly, and the design of effective absorption systems is critical for managing on-site wastewater disposal.