What soil infiltration rate qualifies for Level One permeable pavement design criteria?

The criteria for Level One permeable pavement design is based on the soil infiltration rate. A soil infiltration rate of less than 0.5 inches per hour indicates that the soil does not drain quickly and is more suitable for Level One permeable pavement systems. This is essential because permeable pavements rely on the soil beneath them to manage water. When the infiltration rate is lower, it is necessary to implement designs that accommodate slower drainage, ensuring that the structure remains functional and effective in managing stormwater.

For example, if the soil were to have a rate that exceeds or is equal to 0.5 inches per hour, the design would need to be adjusted to a Level Two or higher, where more aggressive stormwater management techniques might be necessary due to the enhanced capacity of the soil to handle water. This difference in infiltration rates means that the design criteria for permeable pavement must be tailored to match the underlying soil's capabilities in effectively managing stormwater.