Wisconsin Mound Soil Absorption System and Area FillPractice Exam

When permeability decreases in a mound installation, it adversely affects the soil's ability to accept and transmit wastewater. Permeability is a measure of how easily fluids can pass through the soil, and when it is low, the soil becomes less capable of absorbing the effluent being introduced.

As a result, the linear loading rate, which is the amount of wastewater applied per unit area over time, decreases. This decrease is necessary to prevent saturation of the soil and ensure proper treatment of the effluent. If the loading rate were to remain the same, it could lead to surface ponding or inadequate treatment, ultimately harming the system's effectiveness and compliance with environmental regulations.

By reducing the linear loading rate in response to decreased permeability, the design ensures that the wastewater can be adequately absorbed, treated, and dispersed, maintaining the integrity and function of the mound system.