What flow rate defines a Class 4 soil acceptance rate?

The flow rate that defines a Class 4 soil acceptance rate is indeed 0.10 gallons per square foot per day. Class 4 soil is characterized by its relatively low permeability, which means that it does not allow water to pass through as easily as soils with higher classifications. This particular flow rate indicates the maximum volume of effluent that can be effectively absorbed by the soil, ensuring adequate treatment and minimizing the risk of contamination.

In OSSF applications, it's crucial to know the acceptance rates of different soil classes, as this determines the appropriate design and sizing of the system. Class 4 soils typically require more careful consideration and management to ensure that the on-site sewage facility operates efficiently and safely. Understanding these classifications helps installers make informed decisions about material and design choices to comply with regulatory requirements and protect public health and the environment.