DD 229:1996 PDF Download

The DD 229:1996 standard provides a method for assessing the relative hydraulic conductivity of permeable surfacings, specifically those used in road construction. The purpose of this standard is to determine the effectiveness of these surfacings in allowing water to pass through them and into the underlying layers of the road.

The standard outlines the procedures for conducting in-situ tests to measure the hydraulic conductivity of the surfacings. These tests involve the use of specific equipment and techniques to measure the rate at which water flows through the surface layer. By evaluating the relative hydraulic conductivity, the standard helps determine the effectiveness of the surfacing in preventing water from pooling on the road, which can lead to safety hazards such as hydroplaning and structural deterioration.