In Level Two permeable pavement design criteria, what is Tv equal to?

In the context of Level Two permeable pavement design criteria, Tv represents the design infiltration rate over a defined period and is crucial for determining the capacity of the permeable pavement system to manage stormwater effectively. The correct formulation for Tv is based on the equation (1.1)(Rv)(A)/12.

This equation includes the Rainfall Volume (Rv) and the Area (A) of the permeable surface. The multiplier of 1.1 in this context accounts for the design's safety factors and allows for variability in infiltration rates due to field conditions, ensuring that the design can cope with uncertainties like soil saturation or reduced permeability over time. By incorporating this factor, the design adheres to best practices in stormwater management, promoting effective drainage and reducing the potential for flooding or water quality issues.

Understanding the importance of this equation helps practitioners evaluate and implement permeable pavements that are not only sufficient in volume capacity but also enhance overall stormwater management efficiency.